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Syracuse University
1.
Moon, Hongsik.
PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS.
Degree: PhD, Electrical Engineering and Computer Science, 2016, Syracuse University
URL: https://surface.syr.edu/etd/588 
► What is the impact of multicore and associated advanced technologies on computational software for science? Most researchers and students have multicore laptops or desktops…
(more)
▼ What is the impact of multicore and associated advanced technologies on
computational software for science? Most researchers and students have multicore laptops or desktops for their research and they need computing power to run
computational software packages. Computing power was initially derived from Central Processing Unit (CPU) clock speed. That changed when increases in clock speed became constrained by power requirements. Chip manufacturers turned to multicore CPU architectures and associated technological advancements to create the CPUs for the future. Most software applications benefited by the increased computing power the same way that increases in clock speed helped applications run faster. However, for
Computational ElectroMagnetics (CEM) software developers, this change was not an obvious benefit – it appeared to be a detriment. Developers were challenged to find a way to correctly utilize the advancements in hardware so that their codes could benefit. The solution was parallelization and this dissertation details the investigation to address these challenges.
Prior to multicore CPUs, advanced computer technologies were compared with the performance using benchmark software and the metric was FLoting-point Operations Per Seconds (FLOPS) which indicates system performance for scientific applications that make heavy use of floating-point calculations. Is FLOPS an effective metric for parallelized CEM simulation tools on new multicore system? Parallel CEM software needs to be benchmarked not only by FLOPS but also by the performance of other parameters related to type and utilization of the hardware, such as CPU, Random Access Memory (RAM), hard disk, network, etc. The codes need to be optimized for more than just FLOPs and new parameters must be included in benchmarking.
In this dissertation, the parallel CEM software named High Order Basis Based Integral Equation Solver (HOBBIES) is introduced. This code was developed to address the needs of the changing computer hardware platforms in order to provide fast, accurate and efficient solutions to large, complex electromagnetic problems. The research in this dissertation proves that the performance of parallel code is intimately related to the configuration of the computer hardware and can be maximized for different hardware platforms. To benchmark and optimize the performance of parallel CEM software, a variety of large, complex projects are created and executed on a variety of computer platforms. The computer platforms used in this research are detailed in this dissertation. The projects run as benchmarks are also described in detail and results are presented. The parameters that affect parallel CEM software on High Performance Computing Clusters (HPCC) are investigated. This research demonstrates methods to maximize the performance of parallel CEM software code.
Advisors/Committee Members: Tapan K. Sarkar, Yoonseok Lee.
Subjects/Keywords: Computational Electromagnetics; Engineering
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APA (6th Edition):
Moon, H. (2016). PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/etd/588
Chicago Manual of Style (16th Edition):
Moon, Hongsik. “PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS.” 2016. Doctoral Dissertation, Syracuse University. Accessed September 17, 2019.
https://surface.syr.edu/etd/588.
MLA Handbook (7th Edition):
Moon, Hongsik. “PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS.” 2016. Web. 17 Sep 2019.
Vancouver:
Moon H. PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS. [Internet] [Doctoral dissertation]. Syracuse University; 2016. [cited 2019 Sep 17].
Available from: https://surface.syr.edu/etd/588.
Council of Science Editors:
Moon H. PARAMETERS THAT AFFECT PARALLEL PROCESSING FOR COMPUTATIONAL ELECTROMAGNETIC SIMULATION CODES ON HIGH PERFORMANCE COMPUTING CLUSTERS. [Doctoral Dissertation]. Syracuse University; 2016. Available from: https://surface.syr.edu/etd/588
Penn State University
2.
Rybicki, Brian William.
ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS.
Degree: MS, Electrical Engineering, 2008, Penn State University
URL: https://etda.libraries.psu.edu/catalog/8698
► Both the fabrication and placement of nanostructures (i.e. structures whose dimensions are on the order of nanometers) has matured to the point where antenna- and…
(more)
▼ Both the fabrication and placement of nanostructures
(i.e. structures whose dimensions are on the order of nanometers)
has matured to the point where antenna- and waveguide-like elements
may be manufactured and precisely placed into useful
configurations. This is of particular interest because it extends
conventional antenna concepts and applications into the terahertz
and even optical regimes. To support these inquiries, it is
necessary to correctly describe the electromagnetic properties with
proper modeling. This thesis will address a few specific topics in
the modeling of nanoscale electromagnetics and novel applications
at terahertz and optical frequencies. First, an analytical
treatment of the scattering from GaP nanowires and asymptotic forms
of the average internal intensities are derived. The ratio of
orthogonally polarized intensities with a vanishingly thin nanowire
confirms the presence of the ‘antenna effect’ in this limit. The
simulation of arrays of metallic nanowires shows that they may
function well as frequency selective surfaces in the mid-infrared.
By introducing a small gap in each nanowire, large near fields are
produced at resonance that may find use in field enhanced
spectroscopy. The excitation of nanowires allows them to function
as optical nanoantennas and they are well described by conventional
antenna parameters such as input impedance, radiation efficiency
and directivity. Nanoantennas can be simulated more efficiently by
taking advantage of the surface impedance condition, though with
less accurate calculation of the input reactance.
Subjects/Keywords: computational electromagnetics; optical antennas;
nanowires
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APA (6th Edition):
Rybicki, B. W. (2008). ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/8698
Chicago Manual of Style (16th Edition):
Rybicki, Brian William. “ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS.” 2008. Masters Thesis, Penn State University. Accessed September 17, 2019.
https://etda.libraries.psu.edu/catalog/8698.
MLA Handbook (7th Edition):
Rybicki, Brian William. “ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS.” 2008. Web. 17 Sep 2019.
Vancouver:
Rybicki BW. ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS. [Internet] [Masters thesis]. Penn State University; 2008. [cited 2019 Sep 17].
Available from: https://etda.libraries.psu.edu/catalog/8698.
Council of Science Editors:
Rybicki BW. ELECTROMAGNETIC MODELING OF NANOWIRES AND OPTICAL
NANOANTENNAS. [Masters Thesis]. Penn State University; 2008. Available from: https://etda.libraries.psu.edu/catalog/8698
University of Waterloo
3.
Connor, Dale.
The Discontinuous Galerkin Method Applied to Problems in Electromagnetism.
Degree: 2012, University of Waterloo
URL: http://hdl.handle.net/10012/6627
► The discontinuous Galerkin method (DGM) is applied to a number of problems in computational electromagnetics. This is achieved by obtaining numerical solutions to Maxwell's equations…
(more)
▼ The discontinuous Galerkin method (DGM) is applied to a number of problems in computational electromagnetics. This is achieved by obtaining numerical solutions to Maxwell's equations using the DGM. The aim of these simulations is to highlight the strengths of the method while showing its resilience in handling problems other schemes may not be able to accurately model.
Although no method will ever be the best choice for every problem in electromagnetics, the discontinuous Galerkin method is able to accurately approximate any problem, although the computational costs can make the scheme impractical for some. Like other time domain schemes, the DGM becomes inefficient on large domains where the solution contains small wavelengths.
We demonstrate that all of the different types of boundary conditions in electromagnetic wave propagation can be implemented into the DGM. Reflection and transmission boundaries fit easily into the framework, whereas perfect absorption requires a more advanced technique known as the perfectly matched layer. We begin by simulating mirrors with several different geometries, and analyze how the DGM method performs, and how it offers a more complete evaluation of the behavior in this problem than some other methods.
Since Maxwell's equations describe the macroscopic features of electromagnetics, our simulations are able to capture the wave features of electromagnetics, such as interference and diffraction. We demonstrate this by accurately modelling Young's double slit experiment, a classic experiment which features well understood interference and diffraction phenomena.
We also extend the basic electromagnetic wave propagation simulations to include situations where the waves travel into new media. The formulation of the DGM for Maxwell's equations allows the numerical solutions to accurately resolve the features at the interface of two media as predicted by the Fresnel coefficients. This allows the DGM to model lenses and other sources of refraction.
We predict that the DGM will become an increasingly valuable method for computational electromagnetics because of its wide range of applicability as well as the lack of undesirable features in the numerical solutions. Furthermore, the only limiting factor for applying DGM, its computational cost, will become less influential as computing power continues to increase, allowing us to apply the DGM to an increasing set of applications.
Subjects/Keywords: Discontinuous Galerkin Method; Computational Electromagnetics
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APA (6th Edition):
Connor, D. (2012). The Discontinuous Galerkin Method Applied to Problems in Electromagnetism. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Connor, Dale. “The Discontinuous Galerkin Method Applied to Problems in Electromagnetism.” 2012. Thesis, University of Waterloo. Accessed September 17, 2019.
http://hdl.handle.net/10012/6627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Connor, Dale. “The Discontinuous Galerkin Method Applied to Problems in Electromagnetism.” 2012. Web. 17 Sep 2019.
Vancouver:
Connor D. The Discontinuous Galerkin Method Applied to Problems in Electromagnetism. [Internet] [Thesis]. University of Waterloo; 2012. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10012/6627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Connor D. The Discontinuous Galerkin Method Applied to Problems in Electromagnetism. [Thesis]. University of Waterloo; 2012. Available from: http://hdl.handle.net/10012/6627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
4.
Yu, Xue.
FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications.
Degree: 2013, University of Toronto
URL: http://hdl.handle.net/1807/35703
► Graphene is a single atomic layer of graphite and has many extraordinary properties. Many graphene based applications have been proposed in recent years and the…
(more)
▼ Graphene is a single atomic layer of graphite and has many extraordinary properties. Many graphene based applications have been proposed in recent years and the need of a time domain simulation tool for studying graphene based devices emerges. This thesis focuses on developing a simulation framework for graphene based devices using finite-difference time-domain (FDTD) method. Formulation for a perfectly matched layer (PML) for the sub-cell FDTD method for thin dispersive layers has been derived and implemented. Such a PML is useful when thin layers extend to the boundaries of the computational domain. Using the sub-cell PML formulation to model the graphene thin layers significantly reduces the computational cost compared to using the conventional FDTD. The proposed formulation is accompanied by detailed validation and error analysis studies. Several graphene applications are simulated using the new framework and the results show good agreement with the respective analytical models.
MAST
Advisors/Committee Members: Sarris, Costas D., Electrical and Computer Engineering.
Subjects/Keywords: computational electromagnetics; FDTD; 0544
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APA (6th Edition):
Yu, X. (2013). FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/35703
Chicago Manual of Style (16th Edition):
Yu, Xue. “FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications.” 2013. Masters Thesis, University of Toronto. Accessed September 17, 2019.
http://hdl.handle.net/1807/35703.
MLA Handbook (7th Edition):
Yu, Xue. “FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications.” 2013. Web. 17 Sep 2019.
Vancouver:
Yu X. FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/1807/35703.
Council of Science Editors:
Yu X. FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/35703
University of California – Berkeley
5.
Miller, Owen Dennis.
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design.
Degree: Electrical Engineering & Computer Sciences, 2012, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/5q91q3f2
► Photonic innovation is becoming ever more important in the modern world. Optical systems are dominating shorter and shorter communications distances, LED's are rapidly emerging for…
(more)
▼ Photonic innovation is becoming ever more important in the modern world. Optical systems are dominating shorter and shorter communications distances, LED's are rapidly emerging for a variety of applications, and solar cells show potential to be a mainstream technology in the energy space. The need for novel, energy-efficient photonic and optoelectronic devices will only increase. This work unites fundamental physics and a novel computational inverse design approach towards such innovation. The first half of the dissertation is devoted to the physics of high-efficiency solar cells. As solar cells approach fundamental efficiency limits, their internal physics transforms. Photonic considerations, instead of electronic ones, are the key to reaching the highest voltages and efficiencies. Proper photon management led to Alta Device's recent dramatic increase of the solar cell efficiency record to 28.3%. Moreover, approaching the Shockley-Queisser limit for any solar cell technology will require light extraction to become a part of all future designs.The second half of the dissertation introduces inverse design as a new computational paradigm in photonics. An assortment of techniques (FDTD, FEM, etc.) have enabled quick and accurate simulation of the "forward problem" of finding fields for a given geometry. However, scientists and engineers are typically more interested in the inverse problem: for a desired functionality, what geometry is needed? Answering this question breaks from the emphasis on the forward problem and forges a new path in computational photonics. The framework of shape calculus enables one to quickly find superior, non-intuitive designs. Novel designs for optical cloaking and sub-wavelength solar cell applications are presented.
Subjects/Keywords: Electromagnetics; computational electromagnetics; inverse design; luminescence; Photonic design; photovoltaics; solar cells
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APA ·
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APA (6th Edition):
Miller, O. D. (2012). Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/5q91q3f2
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Miller, Owen Dennis. “Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design.” 2012. Thesis, University of California – Berkeley. Accessed September 17, 2019.
http://www.escholarship.org/uc/item/5q91q3f2.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miller, Owen Dennis. “Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design.” 2012. Web. 17 Sep 2019.
Vancouver:
Miller OD. Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design. [Internet] [Thesis]. University of California – Berkeley; 2012. [cited 2019 Sep 17].
Available from: http://www.escholarship.org/uc/item/5q91q3f2.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miller OD. Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design. [Thesis]. University of California – Berkeley; 2012. Available from: http://www.escholarship.org/uc/item/5q91q3f2
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Varis, Karri.
Computational Methods for Finite Thickness Photonic Crystals.
Degree: 2005, Helsinki University of Technology
URL: http://lib.tkk.fi/Diss/2005/isbn951227938X/
► We develop a computational algorithm for finite thickness photonic crystals and apply it to photonic crystal slabs and artificial opals. The algorithm is not limited…
(more)
▼ We develop a
computational algorithm for finite thickness photonic crystals and apply it to photonic crystal slabs and artificial opals. The algorithm is not limited to solving only photonic crystals but can be applied to any electromagnetic problem, which is periodic in a plane and has a finite thickness in the perpendicular direction. An application in cylindrical coordinates is also presented. The method is based on the diagonalized form of Maxwell's equations, in which one spatial direction is distinguished and isolated. We show that this formulation is especially suitable for problems, which are periodic along two and non-periodic along the third axis. The fields are expanded in a combination of several bases, planewaves in the transversal plane, finite differences and eigenvectors in the perpendicular direction. The method is applied to both eigenmode and excitation problems. Furthermore, we develop an efficient scheme for computing the reflection of arbitrarily shaped and polarised beams from the surface of a periodic media. A great emphasis is laid on accuracy and efficiency. The resulting equations are solved using iterative techniques together with problem adapted, operator level preconditioners. Finally, we compare the computations to measurement results obtained from artificial opals.
Advisors/Committee Members: Helsinki University of Technology, Department of Electrical and Communications Engineering, Optoelectronics laboratory.
Subjects/Keywords: photonic crystals; computational electromagnetics; synthetic opals
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APA (6th Edition):
Varis, K. (2005). Computational Methods for Finite Thickness Photonic Crystals. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2005/isbn951227938X/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Varis, Karri. “Computational Methods for Finite Thickness Photonic Crystals.” 2005. Thesis, Helsinki University of Technology. Accessed September 17, 2019.
http://lib.tkk.fi/Diss/2005/isbn951227938X/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Varis, Karri. “Computational Methods for Finite Thickness Photonic Crystals.” 2005. Web. 17 Sep 2019.
Vancouver:
Varis K. Computational Methods for Finite Thickness Photonic Crystals. [Internet] [Thesis]. Helsinki University of Technology; 2005. [cited 2019 Sep 17].
Available from: http://lib.tkk.fi/Diss/2005/isbn951227938X/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Varis K. Computational Methods for Finite Thickness Photonic Crystals. [Thesis]. Helsinki University of Technology; 2005. Available from: http://lib.tkk.fi/Diss/2005/isbn951227938X/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
7.
Du, Xuan.
Mode-Matching Analysis of Whispering-Gallery-Mode Cavities.
Degree: Department of Electrical and Computer Engineering, 2013, University of Victoria
URL: http://hdl.handle.net/1828/5113
► This thesis presents a full-vectorial mode matching method for whispering gallery microcavity analysis. With this technique, optical properties such as resonance wavelength, quality factor and…
(more)
▼ This thesis presents a full-vectorial mode matching method for whispering gallery microcavity analysis. With this technique, optical properties such as resonance wavelength, quality factor and electromagnetic field distribution of an arbitrarily shaped microcavity can be computed with high accuracy. To illustrate this, a mode matching analysis that involves a single propagating whispering gallery mode is performed on a microtoroid in the presence of individual nonplasmonic nanoparticle on its surface. This method is also extended to the analysis of cavity adsorbed by a plasmonic
nanoparticle at a wavelength close to plasmon resonance where the resulting field distortion invalidates other approaches. The simulation demonstrates high efficiency and is in close agreement with experimental measurements reported in previous work. Furthermore, we extend our mode matching analysis to the case where multiple whispering gallery modes are involved in the course of light propagation. The new formalism is performed on a cavity-waveguide coupling system to investigate the light delivery from a tapered optical waveguide to a microcavity at high precision. A novel hybrid integration scheme to implement an ultra-high quality factor microcavity on a silicon-on-insulator platform is proposed based on the related modelling results.
Advisors/Committee Members: Lu, Tao (supervisor).
Subjects/Keywords: Micro-optical devices; resonators; Detection; computational electromagnetics
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APA ·
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Export
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Manager
APA (6th Edition):
Du, X. (2013). Mode-Matching Analysis of Whispering-Gallery-Mode Cavities. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/5113
Chicago Manual of Style (16th Edition):
Du, Xuan. “Mode-Matching Analysis of Whispering-Gallery-Mode Cavities.” 2013. Masters Thesis, University of Victoria. Accessed September 17, 2019.
http://hdl.handle.net/1828/5113.
MLA Handbook (7th Edition):
Du, Xuan. “Mode-Matching Analysis of Whispering-Gallery-Mode Cavities.” 2013. Web. 17 Sep 2019.
Vancouver:
Du X. Mode-Matching Analysis of Whispering-Gallery-Mode Cavities. [Internet] [Masters thesis]. University of Victoria; 2013. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/1828/5113.
Council of Science Editors:
Du X. Mode-Matching Analysis of Whispering-Gallery-Mode Cavities. [Masters Thesis]. University of Victoria; 2013. Available from: http://hdl.handle.net/1828/5113
University of Illinois – Urbana-Champaign
8.
Liu, Aiyin.
A computational electromagnetic framework for waveguide quantum electrodynamics.
Degree: MS, Electrical & Computer Engr, 2016, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/95487
► In this thesis, a framework for cavity and waveguide quantum electrodynamic (CQED, and WQED, respectively) problems is presented. The essence of this framework is to…
(more)
▼ In this thesis, a framework for cavity and waveguide quantum electrodynamic (CQED, and WQED, respectively) problems is presented. The essence of this framework is to use the dyadic Green's function (DGF) to obtain the local density of states (LDOS) and radiative shift of a two-level system (TLS) embedded in an arbitrary electromagnetic continuum. The dressed states of the system are also found using a method of direct diagonalization of operators. The physics and essential features of the dressed states are related to the DGF. The dynamics of the system are solved in connection with the resolvent formalism of quantum scattering theory.
The work presented here represent the first attempts in this important topic of study. This thesis accomplishes the full solution of the problem of a two-level atom coupled to arbitrary lossless electromagnetic environments. The cases of transmission line, hollow rectangular waveguide and free space are considered. At the same time, an attempt to gather much of the required background for this highly interdisciplinary topic is made, in particular, the quantization of an arbitrary lossless waveguide is presented in detail, which to the best of our knowledge, has not appeared in the literature. More detailed investigations will follow in a Ph.D. dissertation.
Advisors/Committee Members: Chew, Weng C (advisor).
Subjects/Keywords: Computational Electromagnetics; Waveguide Quantumelectrodynamics; Dyadic Green's Function
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APA (6th Edition):
Liu, A. (2016). A computational electromagnetic framework for waveguide quantum electrodynamics. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95487
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Liu, Aiyin. “A computational electromagnetic framework for waveguide quantum electrodynamics.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed September 17, 2019.
http://hdl.handle.net/2142/95487.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liu, Aiyin. “A computational electromagnetic framework for waveguide quantum electrodynamics.” 2016. Web. 17 Sep 2019.
Vancouver:
Liu A. A computational electromagnetic framework for waveguide quantum electrodynamics. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/2142/95487.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liu A. A computational electromagnetic framework for waveguide quantum electrodynamics. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95487
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
9.
Bensdorp, S.
Comparative study of light trapping strategies in thin film solar cells :.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f98c3774-9246-4093-bab6-ae6d532e4b53
► In this thesis we perform a in-depth comparison study between different geometri- cal possibilities for solar cells to find an optimal design. Basic numerical experiments…
(more)
▼ In this thesis we perform a in-depth comparison study between different geometri- cal possibilities for solar cells to find an optimal design. Basic numerical experiments on the essential parts of the improve- ments in the geometry were performed separately to obtain an indication about increasing efficiency for 2D configurations. Our research has a strong focus on the inclusion of metallic and dielectric nanoparticles to enhance absorption efficiency.
Advisors/Committee Members: Budko, N.V..
Subjects/Keywords: thin film solar cell; computational electromagnetics
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APA (6th Edition):
Bensdorp, S. (2011). Comparative study of light trapping strategies in thin film solar cells :. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f98c3774-9246-4093-bab6-ae6d532e4b53
Chicago Manual of Style (16th Edition):
Bensdorp, S. “Comparative study of light trapping strategies in thin film solar cells :.” 2011. Masters Thesis, Delft University of Technology. Accessed September 17, 2019.
http://resolver.tudelft.nl/uuid:f98c3774-9246-4093-bab6-ae6d532e4b53.
MLA Handbook (7th Edition):
Bensdorp, S. “Comparative study of light trapping strategies in thin film solar cells :.” 2011. Web. 17 Sep 2019.
Vancouver:
Bensdorp S. Comparative study of light trapping strategies in thin film solar cells :. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Sep 17].
Available from: http://resolver.tudelft.nl/uuid:f98c3774-9246-4093-bab6-ae6d532e4b53.
Council of Science Editors:
Bensdorp S. Comparative study of light trapping strategies in thin film solar cells :. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:f98c3774-9246-4093-bab6-ae6d532e4b53
Delft University of Technology
10.
Zimmerling, J.T.
Modeling of wave propagation in open domains: A Krylov subspace approach:.
Degree: 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:aea44c4e-2658-474d-b9ea-c046066ac881
► Simulating electromagnetic or acoustic wave propagation in complex open structures is extremely important in many areas of science and engineering. In a wide range of…
(more)
▼ Simulating electromagnetic or acoustic wave propagation in complex open structures is extremely important in many areas of science and engineering. In a wide range of applications, ranging from photonics and plasmonics to seismic exploration, efficient wave field solvers are required in various design and optimization frameworks.
In this thesis, a Krylov subspace projection methodology is presented to efficiently solve wave propagation problems on unbounded domains. To model the extension of the
computational domain to infinity, an optimal complex scaling method is introduced. Traditionally, complex scaling has been used to simulate open quantum systems. Here, an optimized complex scaling method is implemented that allows us to simulate wave propagation on unbounded domains provided we compute the propagating waves via a stability-corrected wave function. In our Krylov subspace framework, this wave function is approximated by polynomial or rational functions, which are obtained via Krylov subspace projection. We show that the field approximations are actually expansions in terms of approximate open resonance modes of the system and we present a novel and highly efficient Krylov subspace implementation for media exhibiting second-order relaxation effects. Numerical examples for one-, two-, and three-dimensional problems illustrate the performance of the method and show that our Krylov resonance expansions significantly outperform conventional solution methods.
Advisors/Committee Members: Remis, R.F..
Subjects/Keywords: Computational Electromagnetics; Krylov subspace; model order reduction
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APA (6th Edition):
Zimmerling, J. T. (2014). Modeling of wave propagation in open domains: A Krylov subspace approach:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:aea44c4e-2658-474d-b9ea-c046066ac881
Chicago Manual of Style (16th Edition):
Zimmerling, J T. “Modeling of wave propagation in open domains: A Krylov subspace approach:.” 2014. Masters Thesis, Delft University of Technology. Accessed September 17, 2019.
http://resolver.tudelft.nl/uuid:aea44c4e-2658-474d-b9ea-c046066ac881.
MLA Handbook (7th Edition):
Zimmerling, J T. “Modeling of wave propagation in open domains: A Krylov subspace approach:.” 2014. Web. 17 Sep 2019.
Vancouver:
Zimmerling JT. Modeling of wave propagation in open domains: A Krylov subspace approach:. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2019 Sep 17].
Available from: http://resolver.tudelft.nl/uuid:aea44c4e-2658-474d-b9ea-c046066ac881.
Council of Science Editors:
Zimmerling JT. Modeling of wave propagation in open domains: A Krylov subspace approach:. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:aea44c4e-2658-474d-b9ea-c046066ac881
University of Manitoba
11.
Shafieipour, Mohammad.
Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method.
Degree: Electrical and Computer Engineering, 2014, University of Manitoba
URL: http://hdl.handle.net/1993/31181
► This dissertation is about efficient computation of the electromagnetic fields with the locally corrected Nyström (LCN) method as a point-based boundary element method (BEM). The…
(more)
▼ This dissertation is about efficient computation of the electromagnetic fields with the locally corrected Nyström (LCN) method as a point-based boundary element method (BEM). The concept of surface integral equations is discussed and the electric field integral equation (EFIE) is derived from the Maxwell’s equations.
Due to its point-based nature, the LCN discretization of the EFIE has some advantages over discretizing the EFIE by the method-of-moments (MoM) which is an element-based BEM. On the other hand, due to maturity of the MoM, a large body of work is available to resolve the numerical issues arising in MoM while there has been less work related to the relatively new LCN. To combine the benefits of the LCN method and the classical Rao-Wilton-Glisson MoM, equivalence between these BEMs are established and their exact relationships are derived. Both the vector-potential EFIE and the mixed-potential EFIE are covered.
Various aspects of achieving HO convergence to the correct answer using high-order (HO) LCN method are discussed. In particular, the patch size limitation, predicting the optimal degrees of freedom, and the effect of dynamic range in the solution are discussed both analytically and numerically to provide concrete motivations towards HO LCN.
The benefits of an HO BEM can not be realized unless an HO geometry representation is used in conjunction with the BEM. Non-uniform rational b-spline (NURBS) surfaces are the most widely adopted HO geometry modelling technique in various disciplines due to their many advantages. However, a typical mesh created out of NURBS surfaces contain both triangular and quadrilateral elements while formulating LCN based on Gaussian quadrature rules on triangular elements have limitations. As a result, the LCN community has mostly adopted LCN based on curvilinear quadrilateral modelling of the geometry. A new class of Newton-Cotes quadrature rules for triangles is proposed to facilitate incorporating NURBS surfaces into the HO LCN.
Advisors/Committee Members: Okhmatovski,Vladimir (ECE, University of Manitoba) (supervisor), LoVetri, Joe (ECE, University of Manitoba) Wang, Bing-Chen (Department of Mechanical Engineering, University of Manitoba) Gedney, Stephen (ECE, University of Colorado) (examiningcommittee).
Subjects/Keywords: Computational Electromagnetics; Locally Corrected Nystrom (LCN) Method
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APA (6th Edition):
Shafieipour, M. (2014). Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31181
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shafieipour, Mohammad. “Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method.” 2014. Thesis, University of Manitoba. Accessed September 17, 2019.
http://hdl.handle.net/1993/31181.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shafieipour, Mohammad. “Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method.” 2014. Web. 17 Sep 2019.
Vancouver:
Shafieipour M. Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method. [Internet] [Thesis]. University of Manitoba; 2014. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/1993/31181.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shafieipour M. Efficient Error-Controllable High-Order Electromagnetic Modelling of Scattering on Electrically Large Targets with the Locally Corrected Nyström Method. [Thesis]. University of Manitoba; 2014. Available from: http://hdl.handle.net/1993/31181
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Syracuse University
12.
Rautio, Brian J.
The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics.
Degree: PhD, Electrical Engineering and Computer Science, 2014, Syracuse University
URL: https://surface.syr.edu/etd/167
► Electromagnetic (EM) solvers are widely used within computer-aided design (CAD) to improve and ensure success of circuit designs. Unfortunately, due to the complexity of…
(more)
▼ Electromagnetic (EM) solvers are widely used within computer-aided design (CAD) to improve and ensure success of circuit designs. Unfortunately, due to the complexity of Maxwell's equations, they are often computationally expensive. While considerable progress has been made in the realm of speed-enhanced EM solvers, these fast solvers generally achieve their results through methods that introduce additional error components by way of geometric approximations, sparse-matrix approximations, multilevel decomposition of interactions, and more. This work introduces the new method, Unified-FFT (UFFT). A derivative of method of moments, UFFT scales as O(N log N), and achieves fast analysis by the unique combination of FFT-enhanced matrix fill operations (MFO) with FFT-enhanced matrix solve operations (MSO).
In this work, two versions of UFFT are developed, UFFT-Precorrected (UFFT-P) and UFFT-Grid Totalizing (UFFT-GT). UFFT-P uses precorrected FFT for MSO and allows the use of basis functions that do not conform to a regular grid. UFFT-GT uses conjugate gradient FFT for MSO and features the capability of reducing the error of the solution down to machine precision. The main contribution of UFFT-P is a fast solver, which utilizes FFT for both MFO and MSO. It is demonstrated in this work to not only provide simulation results for large problems considerably faster than state of the art commercial tools, but also to be capable of simulating geometries which are too complex for conventional simulation. In UFFT-P these benefits come at the expense of a minor penalty to accuracy.
UFFT-GT contains further contributions as it demonstrates that such a fast solver can be accurate to numerical precision as compared to a full, direct analysis. It is shown to provide even more algorithmic efficiency and faster performance than UFFT-P. UFFT-GT makes an additional contribution in that it is developed not only for planar geometries, but also for the case of multilayered dielectrics and metallization. This functionality is particularly useful for multi-layered printed circuit boards (PCBs) and integrated circuits (ICs). Finally, UFFT-GT contributes a 3D planar solver, which allows for current to be discretized in the z-direction. This allows for similar fast and accurate simulation with the inclusion of some 3D features, such as vias connecting metallization planes.
Advisors/Committee Members: Jay K. Lee, Vladimir I. Okhmatovski.
Subjects/Keywords: Computational Electromagnetics; Computational Methods; Fast Algorithms; Fast Methods; Method of Moments; Numerical Electromagnetics; Engineering
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APA (6th Edition):
Rautio, B. J. (2014). The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/etd/167
Chicago Manual of Style (16th Edition):
Rautio, Brian J. “The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics.” 2014. Doctoral Dissertation, Syracuse University. Accessed September 17, 2019.
https://surface.syr.edu/etd/167.
MLA Handbook (7th Edition):
Rautio, Brian J. “The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics.” 2014. Web. 17 Sep 2019.
Vancouver:
Rautio BJ. The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics. [Internet] [Doctoral dissertation]. Syracuse University; 2014. [cited 2019 Sep 17].
Available from: https://surface.syr.edu/etd/167.
Council of Science Editors:
Rautio BJ. The Unified-FFT Method for Fast Solution of Integral Equations as Applied to Shielded-Domain Electromagnetics. [Doctoral Dissertation]. Syracuse University; 2014. Available from: https://surface.syr.edu/etd/167
UCLA
13.
Luong, Kevin Quy Tanh.
A Three Dimensional Finite Difference Time Domain Sub-Gridding Method.
Degree: Electrical and Computer Engineering, 2019, UCLA
URL: http://www.escholarship.org/uc/item/9pr26221
► The finite difference time domain method has long been one of the most widely used numerical methods for solving Maxwell’s equations due in part to…
(more)
▼ The finite difference time domain method has long been one of the most widely used numerical methods for solving Maxwell’s equations due in part to its accuracy, explicit nature, and simplicity of implementation. Modern research interests have created a need for this method to be extended to handle multi-scale multi-physics problems where numerous physical phenomena are coupled with classical electrodynamics. These phenomena typically occur on vastly different spatial scales; however, the conventional finite difference time domain method requires a uniform spatial discretization across the entire simulation space. Additionally, the maximum time evolution that may be solved in a single iteration of the algorithm is proportional to the smallest discretization length. Consequently, properly resolving the smallest feature of a multiscale problem causes phenomena of a larger scale to be over-resolved, resulting in an unnecessarily large amount of memory and often an impractical number of computations required for simulation. The development of a capability for sub-gridding, where local domains of fine resolution may be incorporated into a simulation space of coarser resolution, is imperative to treat this issue. This thesis proposes a new algorithm to implement sub-gridding. The results of comprehensive numerical evaluations show promise for this algorithm to be of general use in solving multi-scale multi-physics problems.
Subjects/Keywords: Electrical engineering; Electromagnetics; Computational physics; computational; electromagnetics; FDTD; multi-physics; multi-scale; sub-gridding
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APA (6th Edition):
Luong, K. Q. T. (2019). A Three Dimensional Finite Difference Time Domain Sub-Gridding Method. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/9pr26221
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Luong, Kevin Quy Tanh. “A Three Dimensional Finite Difference Time Domain Sub-Gridding Method.” 2019. Thesis, UCLA. Accessed September 17, 2019.
http://www.escholarship.org/uc/item/9pr26221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luong, Kevin Quy Tanh. “A Three Dimensional Finite Difference Time Domain Sub-Gridding Method.” 2019. Web. 17 Sep 2019.
Vancouver:
Luong KQT. A Three Dimensional Finite Difference Time Domain Sub-Gridding Method. [Internet] [Thesis]. UCLA; 2019. [cited 2019 Sep 17].
Available from: http://www.escholarship.org/uc/item/9pr26221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luong KQT. A Three Dimensional Finite Difference Time Domain Sub-Gridding Method. [Thesis]. UCLA; 2019. Available from: http://www.escholarship.org/uc/item/9pr26221
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Catholique de Louvain
14.
Hubert, Simon.
Numerical analysis of strongly coupled antenna arrays and metasurfaces.
Degree: 2018, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/198381
► Nowadays, communication technologies form an essential part of our everyday lives. Antenna systems receive thus more and more attention from both industrial and academic actors.…
(more)
▼ Nowadays, communication technologies form an essential part of our everyday lives. Antenna systems receive thus more and more attention from both industrial and academic actors. These modern technologies are increasingly complex, and require fast prototyping and benchmarking in their design process. Numerical methods play a key role in that perspective, by providing an accurate estimation of the performance at low cost. However, the computation time and memory required by these electromagnetic simulators remain prohibitively high for certain classes of problems. This thesis focuses on the development of specialized numerical methods, with the goal of mitigating their computational cost. The proposed methods are physics-based optimizations of the Method of Moments, which has been ubiquitous in the analysis of planar and metallic antenna structures. Motivated by the recent and exciting advances in the field of metasurface antennas, the main part of the dissertation is dedicated to planar structures. The contributions range from essentially theoretical results, such as mathematical links between well-established antenna theory results; to efficient solvers exploiting the Contour-FFT for the analysis of large planar arbitrary arrays; to the development of miniaturized shielded arrays for localization applications.
(FSA - Sciences de l'ingénieur) – UCL, 2018
Advisors/Committee Members: UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique, UCL - Ecole Polytechnique de Louvain, Craeye, Christophe, Oestges, Claude, Bol, David, Gilles, Thierry, Hum, Sean, Mesa, Francisco.
Subjects/Keywords: Antenna; Metasurface; Electromagnetics; Computational electromagnetics; Antenna array; Numerical method; Algorithm; Simulation; Mutual coupling; Numerical analysis
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APA (6th Edition):
Hubert, S. (2018). Numerical analysis of strongly coupled antenna arrays and metasurfaces. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/198381
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hubert, Simon. “Numerical analysis of strongly coupled antenna arrays and metasurfaces.” 2018. Thesis, Université Catholique de Louvain. Accessed September 17, 2019.
http://hdl.handle.net/2078.1/198381.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hubert, Simon. “Numerical analysis of strongly coupled antenna arrays and metasurfaces.” 2018. Web. 17 Sep 2019.
Vancouver:
Hubert S. Numerical analysis of strongly coupled antenna arrays and metasurfaces. [Internet] [Thesis]. Université Catholique de Louvain; 2018. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/2078.1/198381.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hubert S. Numerical analysis of strongly coupled antenna arrays and metasurfaces. [Thesis]. Université Catholique de Louvain; 2018. Available from: http://hdl.handle.net/2078.1/198381
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
Wang, Wei.
Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod.
Degree: MS, Electrical & Computer Engineering, 2010, University of Massachusetts
URL: https://scholarworks.umass.edu/theses/402
► Modeling and design of high frequency electronic systems such as antennas and microwave devices require the rigorous numerical solution of Maxwell’s equa- tions. The frequency-domain…
(more)
▼ Modeling and design of high frequency electronic systems such as antennas and microwave devices require the rigorous numerical solution of Maxwell’s equa- tions. The frequency-domain (time-harmonic) tangential vector finite element method (TVFEM) for Maxwell equations results in a second-order dynamical electromagnetic model that must be repeatedly solved for multiple frequencies, excitation or material parameters each design loop. This leads to extremely long design turnaround that often is not optimal. This work will propose an accurate, error controllable and ef- ficient multi-parametric model order reduction scheme that significantly accelerate these parameters sweep. At the core of this work is the proper orthogonal decompo- sition (POD) sampling technique and balanced truncation (BT) algorithm that are used to reduce multi-parameter spaces that include frequency, material parameters and infinite array scan angles. The proposed methodology employs a novel computa- tional scheme based on adaptive POD sampling and the singular value decomposition (SVD) of the low-rank Hankel matrix. Numerical examples confirm the significant time savings and good accuracy of the method for a diverse set of high-frequency electromagnetic systems.
Advisors/Committee Members: Marinos N. Vouvakis.
Subjects/Keywords: model order reduction (MOR); finite element method (FEM); computational electromagnetics; SVD MOR; Electromagnetics and Photonics
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APA (6th Edition):
Wang, W. (2010). Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod. (Masters Thesis). University of Massachusetts. Retrieved from https://scholarworks.umass.edu/theses/402
Chicago Manual of Style (16th Edition):
Wang, Wei. “Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod.” 2010. Masters Thesis, University of Massachusetts. Accessed September 17, 2019.
https://scholarworks.umass.edu/theses/402.
MLA Handbook (7th Edition):
Wang, Wei. “Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod.” 2010. Web. 17 Sep 2019.
Vancouver:
Wang W. Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod. [Internet] [Masters thesis]. University of Massachusetts; 2010. [cited 2019 Sep 17].
Available from: https://scholarworks.umass.edu/theses/402.
Council of Science Editors:
Wang W. Fast Parameter-Space Sweep of Wideband Electromagnetic Systems Using Bt-pod. [Masters Thesis]. University of Massachusetts; 2010. Available from: https://scholarworks.umass.edu/theses/402
University of Kentucky
16.
Boyd, Darren Ray.
A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples.
Degree: 2014, University of Kentucky
URL: http://uknowledge.uky.edu/ece_etds/39
► The frequency demands of radiating systems are moving into the terahertz band with potential applications that include sensing, imaging, and extremely broadband communication. One commonly…
(more)
▼ The frequency demands of radiating systems are moving into the terahertz band with potential applications that include sensing, imaging, and extremely broadband communication. One commonly used method for generating and detecting terahertz waves is to excite a voltage-biased photoconductive antenna with an extremely short laser pulse. The pulsed laser generates charge carriers in a photoconductive substrate which are swept onto the metallic antenna traces to produce an electric current that radiates or detects a terahertz band signal. Therefore, analysis of a photoconductive antenna requires simultaneous solutions of both semiconductor physics equations (including drift-diffusion and continuity relations) and Maxwell’s equations. A multi-physics analysis scheme based on the Discontinuous-Galerkin Finite-Element Time-Domain (DGFETD) is presented that couples the semiconductor drift-diffusion equations with the electromagnetic Maxwell’s equations. A simple port model is discussed that efficiently couples the two equation sets. Various photoconductive antennas were fabricated using TiAu metallization on a GaAs substrate and the fabrication process is detailed. Computed emission intensities are compared with measured data. Optimized antenna designs based on the analysis are presented for a variety of antenna configurations.
Subjects/Keywords: Computational Electromagnetics; Photoconductive Antenna; Device Fabrication; Semiconductor Physics; Electromagnetics; Electromagnetics and Photonics; Electronic Devices and Semiconductor Manufacturing; Nanotechnology Fabrication
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APA (6th Edition):
Boyd, D. R. (2014). A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples. (Masters Thesis). University of Kentucky. Retrieved from http://uknowledge.uky.edu/ece_etds/39
Chicago Manual of Style (16th Edition):
Boyd, Darren Ray. “A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples.” 2014. Masters Thesis, University of Kentucky. Accessed September 17, 2019.
http://uknowledge.uky.edu/ece_etds/39.
MLA Handbook (7th Edition):
Boyd, Darren Ray. “A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples.” 2014. Web. 17 Sep 2019.
Vancouver:
Boyd DR. A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples. [Internet] [Masters thesis]. University of Kentucky; 2014. [cited 2019 Sep 17].
Available from: http://uknowledge.uky.edu/ece_etds/39.
Council of Science Editors:
Boyd DR. A Multi-Physics Computational Approach to Simulating THz Photoconductive Antennas with Comparison to Measured Data and Fabrication of Samples. [Masters Thesis]. University of Kentucky; 2014. Available from: http://uknowledge.uky.edu/ece_etds/39
University of Kentucky
17.
Pfeiffer, Robert.
CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS.
Degree: 2015, University of Kentucky
URL: http://uknowledge.uky.edu/ece_etds/79
► Higher-order basis functions are widely used to model currents and fields in numerical simulations of electromagnetics problems because of the greater accuracy and computational efficiency…
(more)
▼ Higher-order basis functions are widely used to model currents and fields in numerical simulations of electromagnetics problems because of the greater accuracy and computational efficiency they can provide. Different problem formulations, such as method of moments (MoM) and the finite element method (FEM) require different constraints on basis functions for optimal performance, such as normal or tangential continuity between cells. In this thesis, a method of automatically generating bases that satisfy the desired basis constraints is applied to a MoM formulation for scattering problems using surface integral equations. Numerical results demonstrate the accuracy of this approach, and show good system matrix conditioning when compared to other higher-order bases.
Subjects/Keywords: Basis Functions; Method of Moments; Electromagnetics; Constrained Basis Functions; Computational Electromagnetics; System Conditioning; Electromagnetics and Photonics
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APA (6th Edition):
Pfeiffer, R. (2015). CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS. (Masters Thesis). University of Kentucky. Retrieved from http://uknowledge.uky.edu/ece_etds/79
Chicago Manual of Style (16th Edition):
Pfeiffer, Robert. “CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS.” 2015. Masters Thesis, University of Kentucky. Accessed September 17, 2019.
http://uknowledge.uky.edu/ece_etds/79.
MLA Handbook (7th Edition):
Pfeiffer, Robert. “CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS.” 2015. Web. 17 Sep 2019.
Vancouver:
Pfeiffer R. CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS. [Internet] [Masters thesis]. University of Kentucky; 2015. [cited 2019 Sep 17].
Available from: http://uknowledge.uky.edu/ece_etds/79.
Council of Science Editors:
Pfeiffer R. CONSTRAINED DIVERGENCE-CONFORMING BASIS FUNCTIONS FOR METHOD OF MOMENTS DISCRETIZATIONS IN ELECTROMAGNETICS. [Masters Thesis]. University of Kentucky; 2015. Available from: http://uknowledge.uky.edu/ece_etds/79
McMaster University
18.
Zhang, Yifan.
Sensitivity Analysis of Scattering Parameters and Its Applications.
Degree: PhD, 2013, McMaster University
URL: http://hdl.handle.net/11375/12918
► This thesis contributes significantly to the advanced applications of scattering parameter sensitivity analysis including the design optimization of high-frequency printed structures and in microwave…
(more)
▼ This thesis contributes significantly to the advanced applications of scattering parameter sensitivity analysis including the design optimization of high-frequency printed structures and in microwave imaging. In both applications, the methods exploit the computational efficiency of the self-adjoint sensitivity analysis (SASA) approach where only one EM simulation suffices to obtain both the responses and their gradients with respect to the optimizable variables. An S-parameter self-adjoint sensitivity formula for multiport planar structures using the method of moments (MoM) current solution is proposed. It can be easily implemented with existing MoM solvers. The shape perturbation which is required in computing the system-matrix derivatives are accommodated by changing the material properties of the local mesh elements. The use of a pre-determined library system matrix further accelerates the design optimization because the writing/reading of the system matrix to/from the disk is avoided. The design optimization of a planar ultra-wide band (UWB) antenna and a double stub tuner are presented as validation examples. In the application of the sensitivity-based imaging, the SASA approach allows for real-time image reconstruction once the field distribution of the reference object (RO) is known. Here, the RO includes the known background medium of the object under test (OUT) and the known antennas. The field distribution can be obtained using simulation or measurement. The spatial resolution is an important measure of the performance of an imaging technique. It represents the smallest detail that can be detected by a given imaging method. The resolution of the sensitivity-based imaging approach has not been studied before. In this thesis, the resolution limits are systematically studied with planar raster scanning and circular array data acquisition. In addition, the method’s robustness to noise is studied. A guideline is presented for an acceptable signal-to-noise ratio (SNR) versus the spatial and frequency sampling rates in designing a data-acquisition system for the method. This thesis validates the sensitivity-based imaging with measured data of human tissue phantoms for the first time. The differences in dielectric properties of the targets are qualitatively reflected in the reconstructed image. A preliminary study of imaging with inexact background information of the OUT is also presented.
Doctor of Philosophy (PhD)
Advisors/Committee Members: Nikolova, Natalia K., Electrical and Computer Engineering.
Subjects/Keywords: computational electromagnetics; sensitivity analysis; inverse scattering; antenna and microwave cicuit design; microwave imaging; Electromagnetics and photonics; Electromagnetics and photonics
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APA (6th Edition):
Zhang, Y. (2013). Sensitivity Analysis of Scattering Parameters and Its Applications. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/12918
Chicago Manual of Style (16th Edition):
Zhang, Yifan. “Sensitivity Analysis of Scattering Parameters and Its Applications.” 2013. Doctoral Dissertation, McMaster University. Accessed September 17, 2019.
http://hdl.handle.net/11375/12918.
MLA Handbook (7th Edition):
Zhang, Yifan. “Sensitivity Analysis of Scattering Parameters and Its Applications.” 2013. Web. 17 Sep 2019.
Vancouver:
Zhang Y. Sensitivity Analysis of Scattering Parameters and Its Applications. [Internet] [Doctoral dissertation]. McMaster University; 2013. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/11375/12918.
Council of Science Editors:
Zhang Y. Sensitivity Analysis of Scattering Parameters and Its Applications. [Doctoral Dissertation]. McMaster University; 2013. Available from: http://hdl.handle.net/11375/12918
University of Colorado
19.
Agrawal, Anurag Satish.
Computational Imaging using Electromagnetic Optics.
Degree: PhD, 2014, University of Colorado
URL: http://scholar.colorado.edu/eeng_gradetds/8
► Modern optical imaging systems make extensive use of computational power for analog pre-processing, analog to digital conversion and digital post-processing. The joint design of…
(more)
▼ Modern optical imaging systems make extensive use of
computational power for analog pre-processing, analog to digital conversion and digital post-processing. The joint design of these elements can be used to optimize the information throughput of optical imaging systems. This paradigm, termed
computational optical imaging, aims at optimizing the output of optical systems in the form of imaging metrics, multidimensional imaging, feature detection, compressive sensing, etc. However, most optical imaging systems rely on the scalar wave theory of light to analyze these modern systems. Light, being an electromagnetic wave is vectorial in nature leading to significant errors in the scalar model when the propagation medium is anisotropic, inhomogeneous or non-linear. Electromagnetic optics, on the other hand, is an all-encompassing theory of light in the classical limit that takes into account the coupled nature of electric and magnetic fields.
In this respect, the effects of anisotropic emission from a fixed dipole emitter on high numerical aperture super-resolution microscopy are investigated. Wide field microscope configurations that allow simultaneous acquisition and measurement of the 3D position and orientation parameters of multiple fixed dipole emitters are proposed. The performance limits of these systems for the 5D imaging of fixed dipole emitters are quantified through comparison of the Cramer-Rao lower bounds in a photon limited environment. Further, experimental validation is provided for simultaneously estimating the 5D dipole parameters using the double-helix phase mask. Binary multi-level fabrication of efficient phase modulation elements to engineer the Green's tensor response of the system to a dipole input is demonstrated.
High numerical aperture objectives give rise to steep incident angles on lens surfaces, leading to resolution losses in imaging systems due to aberrations caused by the incorrect assumption of linearity between the incident and refracted angles at material interfaces. A new paradigm, termed infinitely refraction-linear artificial material (IRAM), is proposed to tackle this problem. IRAM maintain the linear relationship between incident and refracted angles beyond the paraxial limit. The inherent anisotropic material parameter requirements for IRAM are summarized. The performance of IRAM lenses is compared to that of conventional isotropic lenses by simulating the diffraction limited spot size of these lenses in Zemax. It is shown that with proper design IRAMs have the potential to improve the resolution of optical imaging systems. Further, another class of artificial metamaterials that use magnetic resonance to realize exotic optical properties is discussed as candidates for super-resolution using the super-lensing effect.
Advisors/Committee Members: Rafael Piestun, Robert Mcleod, Kelvin Wagner, Wounjhang Park, Ivan Smalyukh.
Subjects/Keywords: Computational Imaging; Diffraction limit; Electromagnetic Optics; Superresolution; Vector Optics; Computational Engineering; Electromagnetics and Photonics; Optics
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APA (6th Edition):
Agrawal, A. S. (2014). Computational Imaging using Electromagnetic Optics. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/eeng_gradetds/8
Chicago Manual of Style (16th Edition):
Agrawal, Anurag Satish. “Computational Imaging using Electromagnetic Optics.” 2014. Doctoral Dissertation, University of Colorado. Accessed September 17, 2019.
http://scholar.colorado.edu/eeng_gradetds/8.
MLA Handbook (7th Edition):
Agrawal, Anurag Satish. “Computational Imaging using Electromagnetic Optics.” 2014. Web. 17 Sep 2019.
Vancouver:
Agrawal AS. Computational Imaging using Electromagnetic Optics. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2019 Sep 17].
Available from: http://scholar.colorado.edu/eeng_gradetds/8.
Council of Science Editors:
Agrawal AS. Computational Imaging using Electromagnetic Optics. [Doctoral Dissertation]. University of Colorado; 2014. Available from: http://scholar.colorado.edu/eeng_gradetds/8
20.
Ortiz guzman, John Erick.
Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques.
Degree: Docteur es, Génie électrique, 2017, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire
URL: http://www.theses.fr/2017IMTA0051
► Cette thèse présente plusieurs nouvelles techniques pour la convergence rapide des solutions aux éléments de frontière de problèmes électromagnétiques. Une attention spéciale a été dédiée…
(more)
▼ Cette thèse présente plusieurs nouvelles techniques pour la convergence rapide des solutions aux éléments de frontière de problèmes électromagnétiques. Une attention spéciale a été dédiée aux formulations pertinentes pour les solutions aux problèmes électromagnétiques dans les tissus biologiques à haute et basse fréquence. Pour les basses fréquences, de nouveaux schémas pour préconditionner et accélérer le problème direct de l'électroencéphalographie sont présentés dans cette thèse. La stratégie de régularisation repose sur une nouvelle formule de Calderon, obtenue dans cette thèse, alors que l'accélération exploite le paradigme d'approximation adaptive croisée (ACA). En ce qui concerne le régime haute fréquence, en vue d'applications de dosimétrie, l'attention de ce travail a été concentrée sur l'étude de la régularisation de l'équation intégrale de Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) à l'aide de techniques hiérarchiques. Le travail comprend une analyse complète de l'équation pour des géométries simplement et non-simplement connectées. Cela a permis de concevoir une nouvelle stratégie de régularisation avec une base hiérarchique permettant d'obtenir une équation pour les milieux pénétrable stable pour un large spectre de fréquence. Un cadre de travail propédeutique de discrétisation et une bibliothèque de calcul pour des thèmes de recherches sur les techniques de Calderon en 2D sont proposés en dernière partie de cette thèse. Cela permettra d'étendre nos recherches à l'imagerie par tomographie.
This thesis presents several new techniques for rapidly converging boundary element solutions of electromagnetic problems. A special focus has been given to formulations that are relevant for electromagnetic solutions in biological tissues both at low and high frequencies. More specifically, as pertains the low-frequency regime, this thesis presents new schemes for preconditioning and accelerating the Forward Problem in Electroencephalography (EEG). The regularization strategy leveraged on a new Calderon formula, obtained in this thesis work, while the acceleration leveraged on an Adaptive-Cross-Approximation paradigm. As pertains the higher frequency regime, with electromagnetic dosimetry applications in mind, the attention of this work focused on the study and regularization of the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) integral equation via hierarchical techniques. In this effort, a complete analysis of the equation for both simply and non-simply connected geometries has been obtained. This allowed to design a new hierarchical basis regularization strategy to obtain an equation for penetrable media which is stable in a wide spectrum of frequencies. A final part of this thesis work presents a propaedeutic discretization framework and associated computational library for 2D Calderon research which will enable our future investigations in tomographic imaging.
Advisors/Committee Members: Andriulli, Francesco Paolo (thesis director).
Subjects/Keywords: Equations intégrales; Électroencéphalographie; Électromagnétisme numérique; Integral equations; Electroencephalography; Computational electromagnetics; 004
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APA (6th Edition):
Ortiz guzman, J. E. (2017). Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques. (Doctoral Dissertation). Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire. Retrieved from http://www.theses.fr/2017IMTA0051
Chicago Manual of Style (16th Edition):
Ortiz guzman, John Erick. “Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques.” 2017. Doctoral Dissertation, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire. Accessed September 17, 2019.
http://www.theses.fr/2017IMTA0051.
MLA Handbook (7th Edition):
Ortiz guzman, John Erick. “Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques.” 2017. Web. 17 Sep 2019.
Vancouver:
Ortiz guzman JE. Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques. [Internet] [Doctoral dissertation]. Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire; 2017. [cited 2019 Sep 17].
Available from: http://www.theses.fr/2017IMTA0051.
Council of Science Editors:
Ortiz guzman JE. Fast boundary element formulations for electromagnetic modelling in biological tissues : Formulations rapides aux éléments de frontière pour la modélisation électromagnétique dans les tissus biologiques. [Doctoral Dissertation]. Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire; 2017. Available from: http://www.theses.fr/2017IMTA0051
Loughborough University
21.
Browne, Daniel R.
Application of multi-core and cluster computing to the Transmission Line Matrix method.
Degree: PhD, 2014, Loughborough University
URL: https://dspace.lboro.ac.uk/2134/14984
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617892
► The Transmission Line Matrix (TLM) method is an existing and established mathematical method for conducting computational electromagnetic (CEM) simulations. TLM models Maxwell s equations by…
(more)
▼ The Transmission Line Matrix (TLM) method is an existing and established mathematical method for conducting computational electromagnetic (CEM) simulations. TLM models Maxwell s equations by discretising the contiguous nature of an environment and its contents into individual small-scale elements and it is a computationally intensive process. This thesis focusses on parallel processing optimisations to the TLM method when considering the opposing ends of the contemporary computing hardware spectrum, namely large-scale computing systems versus small-scale mobile computing devices. Theoretical aspects covered in this thesis are: The historical development and derivation of the TLM method. A discrete random variable (DRV) for rain-drop diameter,allowing generation of a rain-field with raindrops adhering to a Gaussian size distribution, as a case study for a 3-D TLM implementation. Investigations into parallel computing strategies for accelerating TLM on large and small-scale computing platforms. Implementation aspects covered in this thesis are: A script for modelling rain-fields using free-to-use modelling software. The first known implementation of 2-D TLM on mobile computing devices. A 3-D TLM implementation designed for simulating the effects of rain-fields on extremely high frequency (EHF) band signals. By optimising both TLM solver implementations for their respective platforms, new opportunities present themselves. Rain-field simulations containing individual rain-drop geometry can be simulated, which was previously impractical due to the lengthy computation times required. Also, computationally time-intensive methods such as TLM were previously impractical on mobile computing devices. Contemporary hardware features on these devices now provide the opportunity for CEM simulations at speeds that are acceptable to end users, as well as providing a new avenue for educating relevant user cohorts via dynamic presentations of EM phenomena.
Subjects/Keywords: 621.384; TLM; Computational electromagnetics; Parallel computing; HPC; Mobile computing; Smartphones
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APA (6th Edition):
Browne, D. R. (2014). Application of multi-core and cluster computing to the Transmission Line Matrix method. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/14984 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617892
Chicago Manual of Style (16th Edition):
Browne, Daniel R. “Application of multi-core and cluster computing to the Transmission Line Matrix method.” 2014. Doctoral Dissertation, Loughborough University. Accessed September 17, 2019.
https://dspace.lboro.ac.uk/2134/14984 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617892.
MLA Handbook (7th Edition):
Browne, Daniel R. “Application of multi-core and cluster computing to the Transmission Line Matrix method.” 2014. Web. 17 Sep 2019.
Vancouver:
Browne DR. Application of multi-core and cluster computing to the Transmission Line Matrix method. [Internet] [Doctoral dissertation]. Loughborough University; 2014. [cited 2019 Sep 17].
Available from: https://dspace.lboro.ac.uk/2134/14984 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617892.
Council of Science Editors:
Browne DR. Application of multi-core and cluster computing to the Transmission Line Matrix method. [Doctoral Dissertation]. Loughborough University; 2014. Available from: https://dspace.lboro.ac.uk/2134/14984 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.617892
McMaster University
22.
Zhang, Yu.
Advances in the adjoint variable method for time-domain electromagnetic simulations.
Degree: DEng, 2015, McMaster University
URL: http://hdl.handle.net/11375/17471
► This thesis covers recent advances in the adjoint variable method for the sensitivity estimations through time-domain electromagnetic simulations. It considers both frequency-independent and frequency-dependent response…
(more)
▼ This thesis covers recent advances in the adjoint variable method for the sensitivity estimations through time-domain electromagnetic simulations. It considers both frequency-independent and frequency-dependent response functions, and at the same time, provides a novel adjoint treatment for addressing dispersive sensitivity parameters in the material constitutive relation. With this proposed adjoint technique, response sensitivities with respect to all N sensitivity parameters can be computed through at most one extra simulations regardless of the value of N. This thesis also extends the existing adjoint technique to estimate all N2 second-order sensitivity entries in the response Hessian matrix through N additional simulations. All adjoint sensitivity techniques presented in this thesis are numerically validated through various practical examples. Comparison shows that our produced adjoint results agree with those produced through central finite-difference approximations or through exact analytical approaches.
Dissertation
Doctor of Engineering (DEng)
Advisors/Committee Members: Bakr, Mohamed H., Electrical and Computer Engineering.
Subjects/Keywords: Adjoint variable method (AVM); computational electromagnetics; finite-difference time-domain (FDTD)
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APA ·
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Export
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APA (6th Edition):
Zhang, Y. (2015). Advances in the adjoint variable method for time-domain electromagnetic simulations. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/17471
Chicago Manual of Style (16th Edition):
Zhang, Yu. “Advances in the adjoint variable method for time-domain electromagnetic simulations.” 2015. Doctoral Dissertation, McMaster University. Accessed September 17, 2019.
http://hdl.handle.net/11375/17471.
MLA Handbook (7th Edition):
Zhang, Yu. “Advances in the adjoint variable method for time-domain electromagnetic simulations.” 2015. Web. 17 Sep 2019.
Vancouver:
Zhang Y. Advances in the adjoint variable method for time-domain electromagnetic simulations. [Internet] [Doctoral dissertation]. McMaster University; 2015. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/11375/17471.
Council of Science Editors:
Zhang Y. Advances in the adjoint variable method for time-domain electromagnetic simulations. [Doctoral Dissertation]. McMaster University; 2015. Available from: http://hdl.handle.net/11375/17471
University of Ottawa
23.
Trembinski, Richard.
The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
.
Degree: 2018, University of Ottawa
URL: http://hdl.handle.net/10393/38602
► Current marine navigation radars are capable of high-resolution imagery of marine ice but are not able to classify the marine ice. Classifying marine ice means…
(more)
▼ Current marine navigation radars are capable of high-resolution imagery of marine ice but are not able to classify the marine ice. Classifying marine ice means identifying the ice as first-year ice, multi-year ice or glacier ice. The latter two ice types are as hard as concrete and capable of damaging even ice hardened vessels such as icebreakers. The Canadian Coast Guard has identified the ability of marine navigation radars to classify marine ice as the single greatest improvement to be made in the safety of Arctic navigation.
This thesis presents new research that improves our understanding of electromagnetic backscatter from marine ice. The goal of this work was two-fold: to demonstrate the feasibility of using commercial computational electromagnetic modelling software to simulate real-world marine ice targets, and to identify an optimum frequency or range of frequencies at which the marine ice targets can be definitively classified.
Engineering models for scattering from electrically large objects made of a highly variable, complex, heterogenous, three-phase mixture of ice, air and brine are developed. To do so, an extensive literature review of the Arctic environment, and the physical and electrical properties of marine ice, is conducted to distill the required geophysical parameters of the three marine ice types of interest in this work. Using well-established dielectric mixing theory, these parameters are applied to homogenize the marine ice and model the target (in the presence of a flat sea halfspace) using a surface integral equation formulation. To reduce the computational resources required to numerically solve the integral equation models using the method of moments, computational electromagnetic modelling studies are conducted to select a suitable seawater halfspace representation and determine if the properties of larger objects can be inferred from scaled down models of the object.
A case study is presented for backscatter from marine ice from 6 to 10 GHz, which explores the effects of frequency on the co- and cross-polarized backscatter intensity (and hence the apparent radar cross-section) of the three marine ice types of interest. Good agreement is found between the co- and cross-polarized backscatter intensity responses found from the engineering model computations and some existing experimental data from real-world marine ice targets.
This work: (a) proves the feasibility of using computational electromagnetic modelling to simulate real-world marine ice targets, providing a new, cost-effective method for the study of backscatter from marine ice; (b) confirms the viability of using cross-polarization as a method of classification; and (c) identifies 10 to 16 GHz as a potential optimal frequency range for the classification of marine ice using dual-polarization radar.
Subjects/Keywords: Computational Electromagnetics;
Modelling;
Marine Ice;
Backscatter;
Radar Cross-Section;
Dual-polarization
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APA (6th Edition):
Trembinski, R. (2018). The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/38602
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Trembinski, Richard. “The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
.” 2018. Thesis, University of Ottawa. Accessed September 17, 2019.
http://hdl.handle.net/10393/38602.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Trembinski, Richard. “The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
.” 2018. Web. 17 Sep 2019.
Vancouver:
Trembinski R. The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
. [Internet] [Thesis]. University of Ottawa; 2018. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10393/38602.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Trembinski R. The Feasibility of Using Computational Electromagnetic Modelling for the Study of Backscatter from Marine Ice
. [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/38602
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
24.
Ricciardi, Gerald F.
A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics.
Degree: PhD, Electrical and Computer Engineering, 2000, Virginia Tech
URL: http://hdl.handle.net/10919/29518
► In the field of antenna design and analysis, often the need arises to numerically extrapolate the far-zone performance of a radiating structure from its known…
(more)
▼ In the field of antenna design and analysis, often the need arises to numerically extrapolate the far-zone performance of a radiating structure from its known (or assumed known) near-zone electromagnetic field. Mathematical processes developed to accomplish such a task are known in the literature as near-zone to far-zone transformations (NZ-FZTs) as well as near-field far-field (NF-FF) transformations. These processes make use of sampled near-zone field quantities along some virtual surface, viz., the transformation surface, that surrounds the radiating structure of interest. Depending upon the application, samples of the required near-zone field quantities are supplied via analytical, empirical, or
computational means. Over the years, a number of NZ-FZT processes have been developed to meet the demands of many applications. In short, their differences include, but are not limited to, the following: (1) the size and shape of the transformation surface, (2) the required near-zone field quantities and how they are sampled, (3) the
computational methodology used, and (4) the imbedding of various application-driven features. Each process has its pros and cons depending upon its specific application as well as the type of radiation structure under consideration. In this dissertation we put forth a new and original NZ-FZT process that allows the transformation surface along which the near-zone is sampled to be spheroidal in shape: namely a prolate or oblate spheroid. Naturally, there are benefits gained in doing so. Our approach uses a formulated eigenfunction expansion of spheroidal wave-harmonics to develop two distinct, yet closely related, NZ-FZT algorithms for each type of spheroidal transformation surface. The process only requires knowledge of the E-field along the transformation surface and does not need the corresponding H-field. Given is a systematic exposition of the formulation, implementation, and verification of the newly developed NZ-FZT process. Accordingly, computer software is developed to implement both NZ-FZT algorithms. In the validation process, analytical and empirical radiation structures serve as
computational benchmarks. Numerical models of both benchmark structures are created by integrating the software with a field solver, viz., a finite-difference time-domain (FDTD) code. Results of these computer models are compared with theoretical and empirical data to provide additional validation.
Advisors/Committee Members: Stutzman, Warren L. (committeechair), Safaai-Jazi, Ahmad (committee member), Rossi, John F. (committee member), Riad, Sedki Mohamed (committee member), Davis, William A. (committee member).
Subjects/Keywords: FDTD; antennas; eigenfunctions; computational electromagnetics
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Ricciardi, G. F. (2000). A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29518
Chicago Manual of Style (16th Edition):
Ricciardi, Gerald F. “A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics.” 2000. Doctoral Dissertation, Virginia Tech. Accessed September 17, 2019.
http://hdl.handle.net/10919/29518.
MLA Handbook (7th Edition):
Ricciardi, Gerald F. “A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics.” 2000. Web. 17 Sep 2019.
Vancouver:
Ricciardi GF. A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics. [Internet] [Doctoral dissertation]. Virginia Tech; 2000. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10919/29518.
Council of Science Editors:
Ricciardi GF. A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics. [Doctoral Dissertation]. Virginia Tech; 2000. Available from: http://hdl.handle.net/10919/29518
25.
García Doñoro, Daniel.
A new software suite for electromagnetics.
Degree: 2018, Universidad Carlos III de Madrid
URL: http://hdl.handle.net/10016/20185
Subjects/Keywords: Computational electromagnetics; CEM; Electrónica
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APA ·
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Export
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Manager
APA (6th Edition):
García Doñoro, D. (2018). A new software suite for electromagnetics. (Thesis). Universidad Carlos III de Madrid. Retrieved from http://hdl.handle.net/10016/20185
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
García Doñoro, Daniel. “A new software suite for electromagnetics.” 2018. Thesis, Universidad Carlos III de Madrid. Accessed September 17, 2019.
http://hdl.handle.net/10016/20185.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
García Doñoro, Daniel. “A new software suite for electromagnetics.” 2018. Web. 17 Sep 2019.
Vancouver:
García Doñoro D. A new software suite for electromagnetics. [Internet] [Thesis]. Universidad Carlos III de Madrid; 2018. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10016/20185.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
García Doñoro D. A new software suite for electromagnetics. [Thesis]. Universidad Carlos III de Madrid; 2018. Available from: http://hdl.handle.net/10016/20185
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
26.
Lezar, Evan.
GPU acceleration of matrix-based methods in computational electromagnetics.
Degree: Electrical and Electronic Engineering, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/6507
► Thesis (PhD (Electrical and Electronic Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: This work considers the acceleration of matrix-based computational electromagnetic (CEM) techniques using graphics…
(more)
▼ Thesis (PhD (Electrical and Electronic Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: This work considers the acceleration of matrix-based computational electromagnetic (CEM)
techniques using graphics processing units (GPUs). These massively parallel processors have
gained much support since late 2006, with software tools such as CUDA and OpenCL greatly
simplifying the process of harnessing the computational power of these devices. As with any
advances in computation, the use of these devices enables the modelling of more complex problems,
which in turn should give rise to better solutions to a number of global challenges faced
at present.
For the purpose of this dissertation, CUDA is used in an investigation of the acceleration
of two methods in CEM that are used to tackle a variety of problems. The first of these is the
Method of Moments (MOM) which is typically used to model radiation and scattering problems,
with the latter begin considered here. For the CUDA acceleration of the MOM presented here,
the assembly and subsequent solution of the matrix equation associated with the method are
considered. This is done for both single and double precision
oating point matrices.
For the solution of the matrix equation, general dense linear algebra techniques are used,
which allow for the use of a vast expanse of existing knowledge on the subject. This also means
that implementations developed here along with the results presented are immediately applicable
to the same wide array of applications where these methods are employed.
Both the assembly and solution of the matrix equation implementations presented result in
signi cant speedups over multi-core CPU implementations, with speedups of up to 300x and
10x, respectively, being measured. The implementations presented also overcome one of the
major limitations in the use of GPUs as accelerators (that of limited memory capacity) with
problems up to 16 times larger than would normally be possible being solved.
The second matrix-based technique considered is the Finite Element Method (FEM), which
allows for the accurate modelling of complex geometric structures including non-uniform dielectric
and magnetic properties of materials, and is particularly well suited to handling bounded
structures such as waveguide. In this work the CUDA acceleration of the cutoff and dispersion
analysis of three waveguide configurations is presented. The modelling of these problems using
an open-source software package, FEniCS, is also discussed.
Once again, the problem can be approached from a linear algebra perspective, with the
formulation in this case resulting in a generalised eigenvalue (GEV) problem. For the problems
considered, a total solution speedup of up to 7x is measured for the solution of the generalised
eigenvalue problem, with up to 22x being attained for the solution of the standard eigenvalue
problem that forms part of the GEV problem.
AFRIKAANSE OPSOMMING: In hierdie werkstuk word die versnelling van matriksmetodes…
Advisors/Committee Members: Davidson, D. B., University of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..
Subjects/Keywords: Electronic engineering; Electromagnetism; Graphics processing units; Computational electromagnetics (CEM)
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lezar, E. (2011). GPU acceleration of matrix-based methods in computational electromagnetics. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/6507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lezar, Evan. “GPU acceleration of matrix-based methods in computational electromagnetics.” 2011. Thesis, Stellenbosch University. Accessed September 17, 2019.
http://hdl.handle.net/10019.1/6507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lezar, Evan. “GPU acceleration of matrix-based methods in computational electromagnetics.” 2011. Web. 17 Sep 2019.
Vancouver:
Lezar E. GPU acceleration of matrix-based methods in computational electromagnetics. [Internet] [Thesis]. Stellenbosch University; 2011. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10019.1/6507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lezar E. GPU acceleration of matrix-based methods in computational electromagnetics. [Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/6507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
27.
Marchand, Renier Gustav.
The method of manufactured solutions for the verification of computational electromagnetic codes.
Degree: PhD, Electrical and Electronic Engineering, 2013, Stellenbosch University
URL: http://hdl.handle.net/10019.1/80210
► ENGLISH ABSTRACT: In this work the Method of Manufactured Solutions (MMS) is introduced for the code veri cation of full-wave frequency dependent electromagnetic computational software.…
(more)
▼ ENGLISH ABSTRACT: In this work the Method of Manufactured Solutions (MMS) is introduced for
the code veri cation of full-wave frequency dependent electromagnetic computational
software.
At rst the method is sketched in the context of the veri cation and validation
process and the need for proper code veri cation is highlighted.
Subsequently, the MMS is investigated in its natural context: the Finite
Element Method, speci cally for the E- eld Vector Wave Equation. The usefulness
of the method to detect error in a computational code is demonstrated.
The selection of Manufactured Solutions is discussed and it is demonstrated
how it can be used to nd the probable cause of bugs. Mutation testing is
introduced and used to show the ability to detect errors present in code.
The MMS is nally applied in a novel manner to a Method of Moments
(MoM) code. The challenges of numerical integration associated with the application
of the operator is discussed and correct integration is successfully
demonstrated. Subsequently the MMS is demonstrated to be successfully applied
to the MoM and mutation testing is used to demonstrate the practical
e cacy of the method.
The application of the MMS to the MoM is the main contribution of this
work.
AFRIKAANSE OPSOMMING: Die Metode van Vervaardigde Oplossings (MVO) word hier bekend gestel vir
die veri kasie van numeriese volgolf frekwensie-afhanklike elektromagnetise
kode.
Die metode word eerstens in die bre e konteks van algemene veri kasie en
validasie geplaas en gevolglik word die noodsaaklikheid van kode veri kasie
beklemtoon.
Daarna, word die toets-metode in die konteks van die Eindige Element
Metode vir die E-veld vektorgolf vergelyking bestudeer. Die MVO is oorspronklik
ontwikkel in die di erentiaalvergelyking omgewing. Die bruikbaarheid van
die metode vir elektromagnetiese simulasies word prakties gedemonstreer deur
die opsporing van werklike foute. Die metode word ook verder ondersoek vir
die oorsprong van foute. Mutasietoetsing word bekendgestel en word gebruik
om die metode verder prakties te veri eer.
Die MVO word laastens in 'n nuwe manier gebruik om 'n Moment Metode
kode te veri eer. Die praktiese probleme betrokke by numeriese integrasie word
ondersoek en die korrekte toepassing van die integraal operator word prakties
gedemonstreer. Daarna, word die MVO in hierdie konteks gedemonstreer deur
verskeie voorbeelde te ondersoek. Mutasietoetsing word weereens gebruik om
na die e ektiewiteit van die MVO te kyk om 'n Moment Metode kode te toets.
Die toepassing van die MVO op 'n Moment Metode kode is die hoof bydrae
van hierdie werk.
Advisors/Committee Members: Davidson, D. B., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..
Subjects/Keywords: Electronic engineering; Electromagnetic fields; Computational electromagnetics; Method of manufactured solutions (MMS)
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Marchand, R. G. (2013). The method of manufactured solutions for the verification of computational electromagnetic codes. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/80210
Chicago Manual of Style (16th Edition):
Marchand, Renier Gustav. “The method of manufactured solutions for the verification of computational electromagnetic codes.” 2013. Doctoral Dissertation, Stellenbosch University. Accessed September 17, 2019.
http://hdl.handle.net/10019.1/80210.
MLA Handbook (7th Edition):
Marchand, Renier Gustav. “The method of manufactured solutions for the verification of computational electromagnetic codes.” 2013. Web. 17 Sep 2019.
Vancouver:
Marchand RG. The method of manufactured solutions for the verification of computational electromagnetic codes. [Internet] [Doctoral dissertation]. Stellenbosch University; 2013. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/10019.1/80210.
Council of Science Editors:
Marchand RG. The method of manufactured solutions for the verification of computational electromagnetic codes. [Doctoral Dissertation]. Stellenbosch University; 2013. Available from: http://hdl.handle.net/10019.1/80210
University of Oklahoma
28.
Perera, Sudantha.
Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems.
Degree: PhD, 2016, University of Oklahoma
URL: http://hdl.handle.net/11244/47142
► The development of a large-scale phased array radar system such as the future MPAR will need a cost-effective tool for predicting electromagnetic characteristics of antennas.…
(more)
▼ The development of a large-scale phased array radar system such as the future MPAR will need a cost-effective tool for predicting electromagnetic characteristics of antennas. Simulating and optimizing of large finite phased array antennas using commercially available solvers are time-consuming and memory-extensive even though they are highly capable of solving general electromagnetic problems with acceptable accuracy. In this work, a full-wave electromagnetic solver based on finite-difference time-domain (FDTD) method has been developed for simulating phased array antennas. The planar array or array element can be simulated, optimized, or analyzed using FDTD theory based on an orthogonal, regular Cartesian lattice. The FDTD updating equation for diagonally anisotropic material was obtained for periodic structure based on the cylindrical coordinate system. This FDTD algorithm can be used to simulate active element patterns of conformally cylindrical array antennas. The simulation of active element patterns in an infinite faceted-cylindrical array was accomplished with a nonorthogonal and unstructured grid. The derivation of FDTD theory and periodic boundary condition for a structure based on the nonorthogonal and unstructured grid is presented. In this work, two simulation schemes, which are based on computed near-field current density information and the physical knowledge of finite array antennas, were presented for predicting broadside array radiation characteristics with the consumption of relatively low
computational resources. The validation of the simulation program and schemes was fulfilled by comparing simulation results with measurements taken by near-field and far-field techniques.
Advisors/Committee Members: Zhang, Yan (advisor), Martin, Kimball (committee member), McCann, Patrick (committee member), Sigmarsson, Hjalti (committee member), Doviak, Richard (committee member).
Subjects/Keywords: Phased Array Antennas; Computational Electromagnetics; Finite Difference Time Domain Method
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APA ·
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APA (6th Edition):
Perera, S. (2016). Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/47142
Chicago Manual of Style (16th Edition):
Perera, Sudantha. “Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed September 17, 2019.
http://hdl.handle.net/11244/47142.
MLA Handbook (7th Edition):
Perera, Sudantha. “Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems.” 2016. Web. 17 Sep 2019.
Vancouver:
Perera S. Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/11244/47142.
Council of Science Editors:
Perera S. Physical Knowledge Based Scalable Phased Array Antenna Modeling for Radar Systems. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/47142
Michigan Technological University
29.
Zhang, Xu.
Controlling light with metadevices.
Degree: PhD, Department of Electrical and Computer Engineering, 2018, Michigan Technological University
URL: https://digitalcommons.mtu.edu/etdr/700
► The development of metamaterials provides a new way to manipulate electromagnetic waves by sub-wavelength artificial structures, and hence brings new properties and functionalities that…
(more)
▼ The development of metamaterials provides a new way to manipulate electromagnetic waves by sub-wavelength artificial structures, and hence brings new properties and functionalities that cannot be found with conventional materials. This leads to the possibility of previously unthought-of applications, including perfect lenses, invisibility cloaks, and perfect absorbers. However, several critical challenges need to be addressed before transiting from intriguing scientific findings to real-world usable devices.
This dissertation deals with two challenges regarding the practical use of metamaterials. Firstly, fabrication of truly three-dimensional (3D) and large-scale metamaterials is needed to increase the degrees of freedom of the functionality for device level applications. Direct laser writing (DLW) technique is a potential choice to fabricate such materials with special design requirements. A hyperbolic metamaterial and a hollow waveguide with negative index metamaterial cladding that satisfy the vertical connectivity requirement are proposed, and hence they have the potential to be fabricated with DLW. Three different magnetic dipoles supported by the hyperbolic metamaterial are investigated and contribute to hyperbolic dispersion. In addition, the adverse effect of material absorption on the hollow waveguide with negative index cladding is studied, which leads to the second challenge: how to avoid losses. A loss compensation technique called the plasmon injection (Π) scheme is successfully applied to an experimental hyperlens and a magnifying superlens. The extension of this Π scheme to the hyperlens is analytically described and numerically implemented. The equivalent of the spatial filter with the Π scheme is demonstrated and the resolution enhancement is obtained for both the hyperlens and the magnifying superlens.
In addition, this dissertation also provides a possible solution to meet the need for miniaturized devices. Metamaterials have potential advantages compared with conventional materials for compact design due to their sub-wavelength unit cells and arbitrary control of electromagnetic responses. An extremely sub-wavelength negative index metamaterial (NIM) working at radio frequency (RF) is proposed. The idea of improving the transparency of the metamaterial by reducing the diluted plasma frequency is investigated. Meanwhile, at optical frequencies, a metamaterial-based beam splitter is proposed and able to achieve polarizing, partially polarizing and non-polarizing properties by changing its geometry.
Advisors/Committee Members: Durdu Guney.
Subjects/Keywords: Metamaterials; Optical design; Computational imaging;
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, X. (2018). Controlling light with metadevices. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/700
Chicago Manual of Style (16th Edition):
Zhang, Xu. “Controlling light with metadevices.” 2018. Doctoral Dissertation, Michigan Technological University. Accessed September 17, 2019.
https://digitalcommons.mtu.edu/etdr/700.
MLA Handbook (7th Edition):
Zhang, Xu. “Controlling light with metadevices.” 2018. Web. 17 Sep 2019.
Vancouver:
Zhang X. Controlling light with metadevices. [Internet] [Doctoral dissertation]. Michigan Technological University; 2018. [cited 2019 Sep 17].
Available from: https://digitalcommons.mtu.edu/etdr/700.
Council of Science Editors:
Zhang X. Controlling light with metadevices. [Doctoral Dissertation]. Michigan Technological University; 2018. Available from: https://digitalcommons.mtu.edu/etdr/700
University of Illinois – Urbana-Champaign
30.
Sarathy, Aditya.
Fast algorithms for small particle scattering problems.
Degree: MS, 1200, 2014, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/50498
► In scattering problems, commonly used techniques are surface and volume integral equations. Discrete dipole approximation (DDA) is an alternate and useful discretization technique to solve…
(more)
▼ In scattering problems, commonly used techniques are surface and volume integral equations. Discrete dipole approximation (DDA) is an alternate and useful discretization technique to solve these problems where the continuum scatterer is replaced by a set of polarizable dipoles. It is an alternative to volume integral equations and produces a dense matrix equation to be solved. Computationally, the method requires the solution of large dense systems of linear equations, and various iterative methods have been employed in the literature for the purpose. In this work, two distinct methods are proposed that can reduce the cost of computation.
The first method to reduce the computation time of the solution is using matrix decomposition methods. The idea in this method is using randomized algorithms for low rank approximating of matrices. When implemented using special kinds of random matrices, the
computational complexity of the multilevel solver is comparable to that of the fast multipole method. These methods, however, require visiting every entry of the interaction matrix at least once, thereby incurring a
computational bottleneck of 𝓞(N
2). They are error controllable and a greater error margin can reduce the computation time.
The second method to reduce the
computational complexity is the fast multipole method (FMM). This is based on the factorization of the Green's function and is useful only in those cases where the Green's function of the system can be decomposed into a product of special functions. The decomposition of the free space Green's function is well known using the addition theorem. However, in more complicated cases, this factorization is extremely complicated. In the case considered in this thesis, however, the scattering problem is formulated using the free space Green's function and can be sped up using the FMM also, which requires much less
computational time than the matrix decomposition method.
Advisors/Committee Members: Chew, Weng Cho (advisor).
Subjects/Keywords: Method of Moments; Computational Electromagnetics; Fast Multipole Method; Matrix Projection Algorithms
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APA ·
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Export
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Manager
APA (6th Edition):
Sarathy, A. (2014). Fast algorithms for small particle scattering problems. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50498
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sarathy, Aditya. “Fast algorithms for small particle scattering problems.” 2014. Thesis, University of Illinois – Urbana-Champaign. Accessed September 17, 2019.
http://hdl.handle.net/2142/50498.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sarathy, Aditya. “Fast algorithms for small particle scattering problems.” 2014. Web. 17 Sep 2019.
Vancouver:
Sarathy A. Fast algorithms for small particle scattering problems. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2014. [cited 2019 Sep 17].
Available from: http://hdl.handle.net/2142/50498.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sarathy A. Fast algorithms for small particle scattering problems. [Thesis]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50498
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] ▶
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Open Access Theses and Dissertations