subject:(FDTD)

University of Manchester

1. Nouman, Muhammad. INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:259435

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The finite dierence time domain (FDTD) method is based on Yee algorithmwhich employs a very simple way to discretize maxwell equations. Any structureof interest is… (more)

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The finite dierence time domain (FDTD) method is based on Yee algorithmwhich employs a very simple way to discretize maxwell equations. Any structureof interest is decomposed into cubic unit cells called voxels and the size of thearea that can be simulated is limited by computer resources.LOD method is an alternative method for the application of the FDTDmethod and it is by design implicit in nature. Implicit methods were introducedto overcome the time step limation inherent in the conventional explicit methods.This implies that a larger time step can be used for the computational domainwhen compared to the normal explicit FDTD method. This results in the speedup of the overall simulation time, highly desirable when electromagnetic fieldsare to be determined for a large computational space or whenever objects havingvery fine details are to be modeled.However during simulation as the wave propagates outward, it will eventuallycome to the edge of the allowable space, which is dictated by how the arrayshave been dimensioned in the program. If nothing were done to address this,unpredictable reflections would be generated that will go back inward. Thus,there would be no way to determine which is the real wave and which is thereflected noise.This is the reason that Absorbing Boundary Conditions (ABCs) have beenan issue for as long as FDTD has been used. In using these absorbing boundaryconditions the objective is to achieve an ideal ABC which absorbs all the outgoingwaves and produces no reflection, along with catering for all incident angles of thewaves propagating towards it. The idea is to simulate the open space in such away that the waves appear to propagate indefinitely. Huygens Absorbing boundaryconditions (HABC) are proactive in both in its design and implementation. Theyincorporate the idea of a hypothetical "Huygens surface" separating the two connectingfield regions such that any field propagating towards the HABC can becanceled by generating a counter field that is equal in magnitude and opposite indirection to its original counterpart.

CD-ROM containing supplementary codes submitted in pocket inside back cover of print version of thesis.'

Advisors/Committee Members: Costen, Fumie.

Subjects/Keywords: FDTD; LOD-FDTD; HABC

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APA (6^th Edition):

Nouman, M. (2015). INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:259435

Chicago Manual of Style (16^th Edition):

Nouman, Muhammad. “INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD.” 2015. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:259435.

MLA Handbook (7^th Edition):

Nouman, Muhammad. “INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD.” 2015. Web. 27 Feb 2021.

Vancouver:

Nouman M. INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Feb 27]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:259435.

Council of Science Editors:

Nouman M. INTRODUCTION OF HUYGENS ABSORBING BOUNDARY CONDITIONS INTO LOD METHOD FOR FDTD. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:259435

2. Mbaye, Mame Diarra. Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues.

Degree: Docteur es, Electronique, Optronique et Systèmes, 2018, Université Paris-Est

URL: http://www.theses.fr/2018PESC1144

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Le développement constant des systèmes de communication soulèvent des inquiétudes sur l’influence des ondes électromagnétique sur le corps humain. Une législation existante permet de rassurer… (more)

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Le développement constant des systèmes de communication soulèvent des inquiétudes sur l’influence des ondes électromagnétique sur le corps humain. Une législation existante permet de rassurer la population, mais, l’exposition quotidienne, souvent multi sources implique des interrogations sur ces nouveaux types d’usages. La méthode des Différence Finies dans le Domaine Temporel (FDTD) permet d’évaluer avec précision le niveau d’exposition a été décrit dans ce manuscrit. Cependant, cette méthode présente des limites si on souhaite représenter des structures présentant des courbures du fait de l’usage de mailles orthogonales. Ce manuscrit est une contribution à la problématique en développant une méthode de FDTD conforme dont les mailles suivent la forme des objets à modéliser. Même si, quelques méthodes de FDTD conforme existantes dans la littérature seront au préalable présentées. Dans cette étude, un soin particulier sera porté sur la validation de la méthode développée à travers plusieurs types de maillages différents et en comparant les résultats obtenus avec HFSS et la FDTD classique. Le débit d’absorption spécifique (DAS) sera également calculé en homogénéisant les tissus humains par pondération volumique. Ce qui permettra de réduire les temps de calcul

The constant development of communication systems raises concerns about the influence of electromagnetic waves on human body. Existing legislation helps to reassure population, but daily exposure, often multi-source, involves questions about these new types of use. The Time Domain Finite Difference (FDTD) method allows accurate assessment of the level of exposure described in this manuscript. However, this method has limitations if it is desired to represent structures with curvatures due to the use of orthogonal meshes. This manuscript is a contribution to the problem by developing a conformal FDTD method whose meshes follow the shape of the objects to be modeled. Even so, some existing FDTD compliant methods in the literature will be presented beforehand. In this study, particular attention will be paid to the validation of the method developed through several different types of meshes and comparing results obtained with HFSS and conventional FDTD. The specific absorption rate (SAR) will also be calculated by homogenizing human tissues by volume weighting. This will reduce computing time

Advisors/Committee Members: Picon, Odile (thesis director).

Subjects/Keywords: Fdtd; Das; Homogénéisation; Fdtd; Sar; Homogenization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mbaye, M. D. (2018). Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2018PESC1144

Chicago Manual of Style (16^th Edition):

Mbaye, Mame Diarra. “Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues.” 2018. Doctoral Dissertation, Université Paris-Est. Accessed February 27, 2021. http://www.theses.fr/2018PESC1144.

MLA Handbook (7^th Edition):

Mbaye, Mame Diarra. “Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues.” 2018. Web. 27 Feb 2021.

Vancouver:

Mbaye MD. Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues. [Internet] [Doctoral dissertation]. Université Paris-Est; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018PESC1144.

Council of Science Editors:

Mbaye MD. Méthode FDTD conforme appliquée au calcul du DAS avec homogénéisation utilisant les caractéristiques des tissus humains : Conformal FDTD applied to SAR calculation with homogenization using characteristics of human tissues. [Doctoral Dissertation]. Université Paris-Est; 2018. Available from: http://www.theses.fr/2018PESC1144

North Carolina State University

3. Mayhew, Rebecca. Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device.

Degree: MS, Electrical Engineering, 2010, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/6315

► This research studies the currents generated within the human body when subjected to a Human Electro-Muscular Incapacitation (HEMI) device â€“ commonly known as a Stun… (more)

▼ This research studies the currents generated within the human body when subjected to a Human Electro-Muscular Incapacitation (HEMI) device â€“ commonly known as a Stun Gun. The currents are calculated using the grid based Finite-Difference Time-Domain (FDTD) method of computational electromagnetics. The FDTD technique consists of first defining the Computational Domain - in this case the model of a human torso and a HEMI device. Then the electromagnetic source is defined and the FDTD algorithm and boundary logic is applied to the computational domain to calculate the magnetic and electric fields within the model. In this research, changes were made to the model of the electromagnetic source and to the model of the human torso in order to determine the changesâ€™ effects on the peak currents observed at key observation points within the body. The electromagnetic source was modeled as both a gap current source and a magnetic frill source. The input signal waveform and the length of wires connecting the HEMI device to the subject were changed. In addition, the probe penetration depth, probe separation width, and probe contact locations were all changed. Finally, changes to the human torso model were made, including modeling the skin in wet and dry conditions, as well as adding clothing of various thickness and electromagnetic properties. This research shows that modeling the source as a gap source or magnetic frill are equivalent and the length of the wires connecting the HEMI device to the subject has no impact on the currents within the body. It also shows that probe penetration and probe separation increase the current penetration into the body. Wet skin, or any slightly conductive layer, reduces current penetration to a greater degree than clothing with no conductive properties. However, the greatest impact on the currents at set observation points within the body was the location of the contact probes. This suggests that when a person is shot with a HEMI device, the location of impact of the probes has more of an effect on the currents that a person is subject to than the depth or separation of the probes, or whether the person was wet or wearing clothes. Advisors/Committee Members: Dr. Leda Lunardi, Committee Member (advisor), Dr. H Troy Nagle, Committee Member (advisor), Dr. Gianluca Lazzi, Committee Chair (advisor).

Subjects/Keywords: HEMI; electromagnetics; FDTD

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APA (6^th Edition):

Mayhew, R. (2010). Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/6315

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mayhew, Rebecca. “Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device.” 2010. Thesis, North Carolina State University. Accessed February 27, 2021. http://www.lib.ncsu.edu/resolver/1840.16/6315.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mayhew, Rebecca. “Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device.” 2010. Web. 27 Feb 2021.

Vancouver:

Mayhew R. Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device. [Internet] [Thesis]. North Carolina State University; 2010. [cited 2021 Feb 27]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/6315.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mayhew R. Finite-Difference Time-Domain Analysis of Currents from a Human Electro-Muscular Incapacitation Device. [Thesis]. North Carolina State University; 2010. Available from: http://www.lib.ncsu.edu/resolver/1840.16/6315

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

4. Hsieh, Hsi-yun. A GUI for Assisting FDTD Computations.

Degree: Master, Electrical Engineering, 2008, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908108-132421

► In the past when we use the FDTD method to analyze electromagnetic problems, it has to properly discretize the structure and time, then analyze by… (more)

Subjects/Keywords: Orthogonal; GUI; Uniform; FDTD

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APA (6^th Edition):

Hsieh, H. (2008). A GUI for Assisting FDTD Computations. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908108-132421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hsieh, Hsi-yun. “A GUI for Assisting FDTD Computations.” 2008. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908108-132421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hsieh, Hsi-yun. “A GUI for Assisting FDTD Computations.” 2008. Web. 27 Feb 2021.

Vancouver:

Hsieh H. A GUI for Assisting FDTD Computations. [Internet] [Thesis]. NSYSU; 2008. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908108-132421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hsieh H. A GUI for Assisting FDTD Computations. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908108-132421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

5. Lin, Yu-Pin. An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures.

Degree: Master, Communications Engineering, 2009, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730109-155853

► Using analytical formula to estimate a complex problem of cavity based on a transmission line approach is called the ETL (Equivalent Transmission Line) method .… (more)

Subjects/Keywords: Array of Apertures; FDTD; ETL

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APA (6^th Edition):

Lin, Y. (2009). An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730109-155853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Yu-Pin. “An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures.” 2009. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730109-155853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Yu-Pin. “An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures.” 2009. Web. 27 Feb 2021.

Vancouver:

Lin Y. An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures. [Internet] [Thesis]. NSYSU; 2009. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730109-155853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin Y. An Efficient Evaluation Scheme of Shielding Effectiveness of Rectangular Enclosures with Array of Small Apertures. [Thesis]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730109-155853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

6. Jones, Charles Rees. THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS.

Degree: PhD, Electrical and Computer Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-163038/ ;

► In the effort to simulate the biologically inspired continuum robots dynamic capabilities, researchers have been faced with the daunting task of simulatingin real-timethe complete… (more)

Subjects/Keywords: FDTD; numerical methods; cosserat rod

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APA (6^th Edition):

Jones, C. R. (2011). THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-163038/ ;

Chicago Manual of Style (16^th Edition):

Jones, Charles Rees. “THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS.” 2011. Doctoral Dissertation, Mississippi State University. Accessed February 27, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-163038/ ;.

MLA Handbook (7^th Edition):

Jones, Charles Rees. “THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS.” 2011. Web. 27 Feb 2021.

Vancouver:

Jones CR. THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2021 Feb 27]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-163038/ ;.

Council of Science Editors:

Jones CR. THE 3D DYNAMICS OF THE COSSERAT ROD AS APPLIED TO CONTINUUM ROBOTICS. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-163038/ ;

Texas A&M University

7. Al-Khaldi, Mohammad Mazen Mohammad. A Finite Difference Time Domain Study on the Design of Microwave Catheters.

Degree: MS, Electrical Engineering, 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/165697

► .An investigation of the design aspects along with proposed improvements in the construction of microwave ablation catheters are reported in this thesis. The computational methods… (more)

▼ .An investigation of the design aspects along with proposed improvements in the construction of microwave ablation catheters are reported in this thesis. The computational methods used to carry out this research include an in-house created cylindrical coordinate rotationally symmetric Finite Difference Time Domain (FDTD) scheme. Firstly, a systematic means of modelling and designing microwave catheters is proposed. The method capitalizes on the rotationally symmetric nature of the microwave catheter and reduces the design from three dimensions to a two-dimensional problem. Secondly issues related to resonant frequency and leaky waves, an inherent property of microwave ablation, are investigated and subsequent solutions are proposed. For the issue of resonant frequency, the addition of a terminating cap halves the catheter’s resonant frequency allowing for acceptable return loss, less than -10 dB, at a resonant frequency of 2.7 GHz without a sleeve choke and 2.45 GHz with a choke. Several designs are investigated in order to eliminate the power coupled into waves travelling along the coaxial feedline’s exterior. The proposed catheter design with the sleeve choke is successful at eliminating surface waves whilst attaining a return loss of -14.61 dB at resonance. The internally matched catheter is equally as effective and attains a return loss of -49.39 dB at resonance while the catheter with a floating sleeve only partially reduces the amplitude of surface waves whilst achieving a return loss of -39.08 dB at resonance. The effectiveness of adding a dielectric cylinder around the monopole in order to improve return loss, bandwidth and overall Specific Absorption Rate (SAR) distribution is also investigated. Near to far field transformations are implemented and the far field pattern of the catheter is shown to be that of a dipole, at resonance. Furthermore, a dispersive FDTD algorithm is developed to incorporate a metamaterial plug. The effects of this are shown to be highly dependent on the dielectric properties of the metamaterial and act to lower the resonant frequency allowing for overall length reductions. Finally, the bioheat equation is investigated and is implemented in the context of microwave catheters by analyzing temperature rise at varying radial distances from the catheter. Advisors/Committee Members: Chang, Kai (advisor), Nevels, Robert D (advisor), Wright, Steven M (committee member), Su, Chin B (committee member).

Subjects/Keywords: FDTD; Catheters; Microwave; Electromagnetics

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APA (6^th Edition):

Al-Khaldi, M. M. M. (2017). A Finite Difference Time Domain Study on the Design of Microwave Catheters. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165697

Chicago Manual of Style (16^th Edition):

Al-Khaldi, Mohammad Mazen Mohammad. “A Finite Difference Time Domain Study on the Design of Microwave Catheters.” 2017. Masters Thesis, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/165697.

MLA Handbook (7^th Edition):

Al-Khaldi, Mohammad Mazen Mohammad. “A Finite Difference Time Domain Study on the Design of Microwave Catheters.” 2017. Web. 27 Feb 2021.

Vancouver:

Al-Khaldi MMM. A Finite Difference Time Domain Study on the Design of Microwave Catheters. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/165697.

Council of Science Editors:

Al-Khaldi MMM. A Finite Difference Time Domain Study on the Design of Microwave Catheters. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165697

Penn State University

8. Luo, Wei. On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22616

► High dielectric materials (HDM) have been used to improve aspects of MRI such as decreasing specific absorption rate (SAR), increasing local signal-to-noise ratio (SNR), and… (more)

▼ High dielectric materials (HDM) have been used to improve aspects of MRI such as decreasing specific absorption rate (SAR), increasing local signal-to-noise ratio (SNR), and enhancing the excitation homogeneity, resulting in an improvement of MRI safety and an increase in imaging quality. The use of HDM comes with a relatively low cost and the HDM could be directly incorporated into the existing clinical practices without additional changes in MRI sequence and patient care. In the current research and development of HDM in MRI, there are several challenges. For example, (I) limited material has been introduced or created as HDM in MRI. (II) New measurement technique may be required to measure the electrical properties of a new HDM in the frequency range that is relevant to MRI. (III) Advanced optimization method is demanded to combine with numerical simulations to design the MRI coil incorporating HDM. (IV) The lack of a fair comparison between the coil design incorporating HDM and the coil design without HDM is one of the reasons that the coil engineers hesitate to use HDM in their design. (V) There is no general guideline on the usage of HDM for clinical practice and this is another reason that slows the development of HDM. Two different studies were discussed in this dissertation to advance the research and development of HDM in MRI. In the first study, a new HDM consisting of sintered BaTiO3 beads in deuterated water was created for MRI applications. This material has a much higher relative permittivity compared to all of the dielectric materials developed before. The relative permittivity and electrical conductivity of this new HDM were characterized at 3T (at approximately 125 MHz) and 7T (at approximately 300 MHz) using resonant cavities. Its superior performance in MRI was demonstrated by comparing the transmit efficiency, receive sensitivity, and SNR to previously used dielectric materials in simulation and experiment at 3T. This new HDM was later used to improve MRI performance in a spine imaging. In the second study, an attempt was made (I) to answer the question that whether an optimal MRI coil incorporated with HDM would outperform an optimal MRI coil without HDM and (II) to explore the improvement in coil efficiency brought by the effect of HDM. A simple hybrid design consisting of a loop coil and an HDM disk was optimized to image a lossy sphere at 123 MHz in electromagnetic simulation using particle swarm optimization. The coil location, coil radius, HDM location, HDM geometry, and HDM material properties were considered together as parameters in the optimization. The performance of the optimal hybrid design for imaging at any depth in the lossy sphere along the coil axis turned out to be better than the corresponding optimal Coil-only design, with an average of 87% and 23% improvement in coil efficiency for locations near the center and periphery of the sphere, respectively. This result showed, for the first time, that an optimal MRI coil incorporated with HDM would outperform an optimal MRI coil… Advisors/Committee Members: Qing X Yang, Dissertation Advisor/Co-Advisor, Qing X Yang, Committee Chair/Co-Chair, Akhlesh Lakhtakia, Committee Member, Michael T Lanagan, Committee Member, Osama O Awadelkarim, Committee Member, Thomas Neuberger, Committee Member, Christopher Collins, Special Member.

Subjects/Keywords: MRI; FDTD; Dielectric Material

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APA (6^th Edition):

Luo, W. (2014). On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22616

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Luo, Wei. “On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging.” 2014. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/22616.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Luo, Wei. “On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging.” 2014. Web. 27 Feb 2021.

Vancouver:

Luo W. On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/22616.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Luo W. On The Potential For Passive Dielectric Materials To Improve Safety And Performance Of Magnetic Resonance Imaging. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22616

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

9. Kwatra, Nitin. Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method.

Degree: MS, Electrical Engineering, 2009, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/1297

► The Alternating-Direction Implicit Finite-Difference Time-Domain (ADI-FDTD) method is a computational electromagnetic method which, unlike the traditional explicit FDTD method, is unconditionally stable and allows arbitrarily… (more)

▼ The Alternating-Direction Implicit Finite-Difference Time-Domain (ADI-FDTD) method is a computational electromagnetic method which, unlike the traditional explicit FDTD method, is unconditionally stable and allows arbitrarily large time steps. The decrease in the simulation time is achieved at the cost of accuracy. However, in computational problems where the results are averaging based, the effects of such local errors are largely minimized. For example, using ADI-FDTD in bioelectromagnetics, quantities like Specific Absorption Rates (SAR) and total induced currents can be computed over models with fine geometrical resolutions without decreasing the time step proportionally. In this work, the volume of neurons excited (recruitment volume) inside a human body due to external electric or magnetic stimulation is computed using the D-H formulation of ADI-FDTD method. The electric stimulation considered is through current injection by contact electrodes of a Human Electro-Muscular Incapacitative (HEMI) device. For magnetic stimulation, two high frequency current pulses flowing in opposite directions in circular coils are considered. A neuron can be excited if the electric field or the gradient of the electric field along its length exceeds the nerve threshold value. These modes of excitation are termed as `end mode' and `center mode' respectively. The nerve excitation threshold values are decided based on experimental investigations on laboratory animals found in the literature. Memory and simulation time requirements are reduced by employing expanding grid techniques and DFT averaging. The uniform grid of a 1 mm resolution model is logarithmically expanded to 5 mm in region far from source such as head, lower legs and arms. This reduces the computational size of the model by 90%. For HEMI current source stimulations, Discrete Fourier Transform (DFT) is used to find the induced electric fields due to the dominant frequencies in the current source. By using quasi-static assumptions, the DFT is evaluated for duration substantially lesser than the time period of the different frequencies. The field values are then obtained as the ratios to the fields at the source and then scaled depending upon the magnitude of the source. This study builds upon the efficient use of use of ADI-FDTD method for the solution of the low frequency bioelectromagnetics problems by employing expanding grid techniques and DFT averaging. Recruitment volumes due to a HEMI current source device are computed. A novel stimulation technique of magnetic stimulation is investigated. Advisors/Committee Members: Dr. J. K. Townsend, Committee Member (advisor), Dr. Griff. L. Bilbro, Committee Member (advisor), Dr. Gianluca Lazzi, Committee Chair (advisor).

Subjects/Keywords: recruitment volume; FDTD; ADI

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APA (6^th Edition):

Kwatra, N. (2009). Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/1297

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kwatra, Nitin. “Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method.” 2009. Thesis, North Carolina State University. Accessed February 27, 2021. http://www.lib.ncsu.edu/resolver/1840.16/1297.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kwatra, Nitin. “Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method.” 2009. Web. 27 Feb 2021.

Vancouver:

Kwatra N. Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method. [Internet] [Thesis]. North Carolina State University; 2009. [cited 2021 Feb 27]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1297.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kwatra N. Computation of recruitment volumes in the human body due to external electric or magnetic stimulation using ADI-FDTD method. [Thesis]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/1297

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

10. 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)

Subjects/Keywords: computational electromagnetics; FDTD; 0544

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APA (6^th 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 (16^th Edition):

Yu, Xue. “FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications.” 2013. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/35703.

MLA Handbook (7^th Edition):

Yu, Xue. “FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications.” 2013. Web. 27 Feb 2021.

Vancouver:

Yu X. FDTD Modeling of Graphene-based RF Devices: Fundamental Aspects and Applications. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Feb 27]. 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

Rice University

11. Cao, Yang. Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure.

Degree: PhD, Natural Sciences, 2015, Rice University

URL: http://hdl.handle.net/1911/87717

► Plasmon is considered to be the incompressible self-oscillation of conducting electrons in small nanoparticles. A classical spring model could be used to describe plasmon’s behavior.… (more)

▼ Plasmon is considered to be the incompressible self-oscillation of conducting electrons in small nanoparticles. A classical spring model could be used to describe plasmon’s behavior. Many different techniques have been applied to understand nanostructure’s plasmonic properties. Electron energy loss spectroscopy (EELS) is one of these tools, which is helpful for us to understand the interaction between fast moving electrons and nanomaterials. It could achieve very high spatial and energy resolution. Here, we develop a new finite-difference time-domain method to calculate EELS spectra and maps, which is based on a commercial software package “Lumerical”. The calculated results for different cases are compared with the well-known boundary element method (BEM) and show an excellent agreement. Our finite-difference time-domain (FDTD) method to calculate EELS spectra has further been proven really helpful by high-density plasmonic dimers’ experimental results. There are basically two different numerical techniques. One is based on finite difference method (FEM) and another is according to finite-difference time-domain method (FDTD). Both of them are very important to perform optical calculations in nanophotonics and plasmonics area. In general, they will try to solve Maxwell equations with many different boundary conditions numerically. Optical properties of nanomaterials are also very tremendous for us to understand plasmonics behavior in the external electromagnetic fields. We systematically performed FEM simulations for different dimensions’ split ring structure and identified each plasmon mode via induced charge plot. Later we also studied hollow Au Nanoshells: hollow Au-Ag Nanoshell and hollow Au-Co Nanoshell. The former showed the surprising in vivo instability in the near infrared region while the later has potential application in hot electron generation. Advisors/Committee Members: Nordlander, Peter J. (advisor), Geurts, Frank (committee member), Halas, Naomi (committee member).

Subjects/Keywords: EELS; FDTD; FEM; plasmonics; nanoshell

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APA (6^th Edition):

Cao, Y. (2015). Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/87717

Chicago Manual of Style (16^th Edition):

Cao, Yang. “Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure.” 2015. Doctoral Dissertation, Rice University. Accessed February 27, 2021. http://hdl.handle.net/1911/87717.

MLA Handbook (7^th Edition):

Cao, Yang. “Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure.” 2015. Web. 27 Feb 2021.

Vancouver:

Cao Y. Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure. [Internet] [Doctoral dissertation]. Rice University; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1911/87717.

Council of Science Editors:

Cao Y. Electron Energy Loss Spectroscopy and Optical Properties of Plasmonic Nanostructure. [Doctoral Dissertation]. Rice University; 2015. Available from: http://hdl.handle.net/1911/87717

Delft University of Technology

12. Kong, F. (author). Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method.

Degree: 2012, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:63a0d200-b44a-40c1-b0ef-35a3f0bcf34a

This thesis has studied how to modify the optical behaviors of the luminescent phosphors by introducing a 1D nanostructure.

Optics

Imaging Physics

Applied Sciences

Advisors/Committee Members: Urbach, H.P. (mentor), Boer, D.D. (mentor).

Subjects/Keywords: FDTD Simulation; Nano; Grating; Phosphor

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APA (6^th Edition):

Kong, F. (. (2012). Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:63a0d200-b44a-40c1-b0ef-35a3f0bcf34a

Chicago Manual of Style (16^th Edition):

Kong, F (author). “Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method.” 2012. Masters Thesis, Delft University of Technology. Accessed February 27, 2021. http://resolver.tudelft.nl/uuid:63a0d200-b44a-40c1-b0ef-35a3f0bcf34a.

MLA Handbook (7^th Edition):

Kong, F (author). “Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method.” 2012. Web. 27 Feb 2021.

Vancouver:

Kong F(. Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2021 Feb 27]. Available from: http://resolver.tudelft.nl/uuid:63a0d200-b44a-40c1-b0ef-35a3f0bcf34a.

Council of Science Editors:

Kong F(. Simulations of the Optical Behaviors of Nanostructured Phosphors Based on FDTD Method. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:63a0d200-b44a-40c1-b0ef-35a3f0bcf34a

University of Notre Dame

13. John Emory McRaven. Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>.

Degree: Electrical Engineering, 2005, University of Notre Dame

URL: https://curate.nd.edu/show/3j333199t75

► The goal of this thesis is to outline the significant issues affecting the performance of antenna-coupled metal-oxide-metal diodes for the detection of infrared radiation,… (more)

Subjects/Keywords: FDTD MOM

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APA (6^th Edition):

McRaven, J. E. (2005). Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/3j333199t75

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

McRaven, John Emory. “Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>.” 2005. Thesis, University of Notre Dame. Accessed February 27, 2021. https://curate.nd.edu/show/3j333199t75.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

McRaven, John Emory. “Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>.” 2005. Web. 27 Feb 2021.

Vancouver:

McRaven JE. Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>. [Internet] [Thesis]. University of Notre Dame; 2005. [cited 2021 Feb 27]. Available from: https://curate.nd.edu/show/3j333199t75.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

McRaven JE. Theoretical Considerations for the Performance of Antenna-Coupled Metal-Oxide-Metal Diodes</h1>. [Thesis]. University of Notre Dame; 2005. Available from: https://curate.nd.edu/show/3j333199t75

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New Mexico

14. Hasan, I.M. Mehdi. FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance.

Degree: Electrical and Computer Engineering, 2012, University of New Mexico

URL: http://hdl.handle.net/1928/20985

► The finite-difference time-domain (FDTD) technique is a very flexible and robust means to solve problems spanning a broad range of applications (defense, communication, computing, semiconductor… (more)

▼ The finite-difference time-domain (FDTD) technique is a very flexible and robust means to solve problems spanning a broad range of applications (defense, communication, computing, semiconductor devices and biomedicine), especially where geometrical complexities, nonlinearities and multiphysics dominate. In this thesis, novel photodetectors are developed via FDTD having sub-wavelength active areas that yield enhanced optical absorption at near-infrared (NIR) wavelengths by way of plasmonics or photonic nanojets. The response time of photodiodes is primarily limited by two factors: (1) the transit time of photo-generated carriers to the electrode and (2) depletion layer capacitance of the semiconductor. The former requires a thinner depletion layer, resulting in a large depletion layer capacitance. To suppress the increase of the depletion layer capacitance, it is necessary to decrease the active area of the photodiode with depletion layer thickness. However, the smaller the active area the lower the output of the photodiode under the constant optical power density. To overcome the trade-off between speed and responsivity, the incident light should be efficiently confined within a small active area. Surface plasmons play an important role in this phenomenon as surface plasmons can enhance the near-field when excited by a certain wavelength. Resonant surface plasmons can confine strong optical near fields in a sub wavelength volume, this has been demonstrated for near- infrared dipole antennas. As an alternative to plasmonics it is proposed here that photonic nanojets may be employed to focus light onto the small active region of a photodetector. A photonic nanojet is a narrow, high-intensity electromagnetic beam that propagates into the background medium from the shadow side surface of a plane-wave illuminated loss-less dielectric micro-cylinder or micro-sphere of diameter greater than the illuminating wavelength, λ. The transverse beam width of the nanojet can be as small as λ/3 and length can be as long as 20λ, so we can use a photonic nanojet to concentrate the energy into a small region. By using the E-field enhancement in a sub-wavelength active area provided by the photonic nanojet and comparing it with the enhancement of the plasmonic structures, we may improve the responsivity and speed of the photodetector. Advisors/Committee Members: Zarkesh-Ha, Payman, Simpson, Jamesina J., Graham, Edward D. Jr., Lester, Luke F., Simpson, Jamesina J., Zarkesh-Ha, Payman.

Subjects/Keywords: FDTD; Plasmonic; Photonic Nanojet

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APA (6^th Edition):

Hasan, I. M. M. (2012). FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/20985

Chicago Manual of Style (16^th Edition):

Hasan, I M Mehdi. “FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance.” 2012. Masters Thesis, University of New Mexico. Accessed February 27, 2021. http://hdl.handle.net/1928/20985.

MLA Handbook (7^th Edition):

Hasan, I M Mehdi. “FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance.” 2012. Web. 27 Feb 2021.

Vancouver:

Hasan IMM. FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance. [Internet] [Masters thesis]. University of New Mexico; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1928/20985.

Council of Science Editors:

Hasan IMM. FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance. [Masters Thesis]. University of New Mexico; 2012. Available from: http://hdl.handle.net/1928/20985

University of Waterloo

15. Matheson, Ryan. An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics.

Degree: 2010, University of Waterloo

URL: http://hdl.handle.net/10012/5001

► This thesis investigates the issues in deriving the Finite Di erence Time Domain Method, including the derivation of a unique method for exciting an FDTD… (more)

Subjects/Keywords: FDTD; Acoustics

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APA (6^th Edition):

Matheson, R. (2010). An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5001

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Matheson, Ryan. “An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics.” 2010. Thesis, University of Waterloo. Accessed February 27, 2021. http://hdl.handle.net/10012/5001.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Matheson, Ryan. “An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics.” 2010. Web. 27 Feb 2021.

Vancouver:

Matheson R. An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics. [Internet] [Thesis]. University of Waterloo; 2010. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10012/5001.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Matheson R. An Investigation and Application of the Finite Difference Time Domain Method as a Tool for Solving Equalization Problems in Acoustics. [Thesis]. University of Waterloo; 2010. Available from: http://hdl.handle.net/10012/5001

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Macêdo, Jorge Andrey da Silva. Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial.

Degree: Mestrado, Telecomunicações, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/ ;

►

Este trabalho apresenta um novo formalismo bi-dimensional em diferenças finitas no domínio do tempo (2D-FDTD) para a simulação de estruturas baseadas em metamateriais. A natureza… (more)

▼

Este trabalho apresenta um novo formalismo bi-dimensional em diferenças finitas no domínio do tempo (2D-FDTD) para a simulação de estruturas baseadas em metamateriais. A natureza dispersiva destes meios é levada em consideração de forma precisa pela inclusão dos modelos materiais de Drude para os tensores permissividade elétrica e permeabilidade magnética. Todos os elementos dos tensores são considerados neste formalismo, o que o torna muito atraente para a modelagem de uma classe geral de estruturas eletromagnéticas. Dois efeitos de enorme impacto são analisados em detalhes, sendo eles a cobertura de invisibilidade e o rotacionamento de campo. Ambos os efeitos requerem a utilização de técnicas de transformação de coordenadas a qual deve ser aplicada apenas na região onde os campos eletromagnéticos precisam ser manipulados, tirando vantagem da invariância das equações de Maxwell quanto a estas operações. Esta técnica redefine localmente os parâmetros de permissividade e permeabilidade do meio transformado. O formalismo implementado apresentou grande estabilidade e precisão, uma conseqüência direta da natureza dispersiva dos modelos materiais de Drude, o que o caracteriza como uma boa contribuição para uma completa compreensão da fenomenologia por trás destes efeitos fascinantes. Os resultados numéricos apresentaram boa concordância com os disponíveis na literatura. Foi também observado que ambas estruturas são muito sensíveis a variações de freqüência do campo de excitação.

This work introduces an extended two-dimensional finite difference time domain method (2D-FDTD) for the simulation of metamaterial based structures. The dispersive nature of these media is accurately taken into account through the inclusion of the Drude material models for the permittivity and permeability tensors. All tensor elements are properly accounted for, making the formalism quite attractive for the modeling of a general class of electromagnetic structures. Two striking effects are investigated with the proposed model, namely, the invisibility cloaking and the field rotation effects. Both effects require the utilization of a coordinate transformation technique which must be applied only in the region where the electromagnetic field needs to be manipulated, taking advantage of the invariance of Maxwell\'s equations with respect to these operations. This technique locally redefines the permittivity and permeability parameters of the transformed media. The implemented formalism has proved to be quite stable and accurate, a direct consequence of the dispersive nature of the Drude material model, which characterizes it as a good contribution to fully understand the phenomenology behind these fascinating effects. The numerical results are in good agreement with those available in the literature. It was also verified that both structures are very sensitive to frequency variations of the excitation field.

Advisors/Committee Members: Borges, Ben Hur Viana.

Subjects/Keywords: Anisotropia; Anisotropy; Dispersive media; FDTD; FDTD; Meios dispersivos; Metamateriais; Metamaterials

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APA (6^th Edition):

Macêdo, J. A. d. S. (2008). Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/ ;

Chicago Manual of Style (16^th Edition):

Macêdo, Jorge Andrey da Silva. “Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial.” 2008. Masters Thesis, University of São Paulo. Accessed February 27, 2021. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/ ;.

MLA Handbook (7^th Edition):

Macêdo, Jorge Andrey da Silva. “Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial.” 2008. Web. 27 Feb 2021.

Vancouver:

Macêdo JAdS. Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial. [Internet] [Masters thesis]. University of São Paulo; 2008. [cited 2021 Feb 27]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/ ;.

Council of Science Editors:

Macêdo JAdS. Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial. [Masters Thesis]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/ ;

Universitat Rovira i Virgili

17. Bertó Roselló, Francisco. Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing.

Degree: Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, 2018, Universitat Rovira i Virgili

URL: http://hdl.handle.net/10803/665620

► Some materials shown particular physical, optical and chemical properties at the nanoscale. The nanotechnology permits to scientist enhance their properties modifying the matter structure at… (more)

▼ Some materials shown particular physical, optical and chemical properties at the nanoscale. The nanotechnology permits to scientist enhance their properties modifying the matter structure at this level and take advantage of them for the development of new devices and applications. Particularly important is the research in biosensing in order to obtain more sensitive and reliable devices with a view for their deployment to society in the form of cost-effective and reliable diagnostic systems. The manufacturing of such devices in some cases implies the manipulation of the light in these materials at the nanoscale, for which it implies to have a deep knowledge of the optical behaviour of the structure. In this sense, the election of the appropriate material is decisive in the development of biosensing devices. Nanoporous anodic alumina (NAA) is a self-ordered porous material which their optical properties in the visible, their great tunability of the structure, their ability to act as a holder or scaffold of small objects and their stability under biological conditions make it especially appropriate as a platform for the development of optical biosensors. Theoretical studies on the NAA optical properties is a fundamental field of research. The numerical modelling of these properties permits to understand their relationship with the structural features of the NAA, providing a conceptual framework for the analysis of their optical behaviour. In this thesis, we have analyzed the suitability and developed several predictive models for the optical properties of the NAA valid in a wide range of geometrical characteristics. Subsequently our simulation model has been applied to study the suitability of two types of gold-coated NAA structures as a platform for reflectometric-based plasmonic biosensors. Finally, a theoretical study of the optical behaviour by means of numerical modelling of gradient-index NAA (NAA-GI) based structures has been performed. Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Ferré-Borrull, Josep (director).

Subjects/Keywords: Alúmina nanoporosa; FDTD simulació; Nanoestructures; FDTD simulación; Nanoestructuras; Nanoporous alumina; FDTD simulation; Nanostructures; Ciències; 004; 535; 62; 621.3

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APA (6^th Edition):

Bertó Roselló, F. (2018). Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/665620

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bertó Roselló, Francisco. “Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing.” 2018. Thesis, Universitat Rovira i Virgili. Accessed February 27, 2021. http://hdl.handle.net/10803/665620.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bertó Roselló, Francisco. “Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing.” 2018. Web. 27 Feb 2021.

Vancouver:

Bertó Roselló F. Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing. [Internet] [Thesis]. Universitat Rovira i Virgili; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10803/665620.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bertó Roselló F. Numerical modelling of nanoporous anodic alumina photonic structures for optical biosensing. [Thesis]. Universitat Rovira i Virgili; 2018. Available from: http://hdl.handle.net/10803/665620

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

18. Li, Wei-hao. Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method.

Degree: Master, Electrical Engineering, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-100007

► Electromagnetic interference problems have become serious gradually because many devices are getting more sophisticated and sensitive in modern life. Designers often need to consider a… (more)

Subjects/Keywords: Adaptive time step; FDTD; Electromagnetic Interference; Subgrid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, W. (2015). Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-100007

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Wei-hao. “Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method.” 2015. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-100007.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Wei-hao. “Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method.” 2015. Web. 27 Feb 2021.

Vancouver:

Li W. Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-100007.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li W. Electromagnetic Interference of Signal Traces Inside a Missile Using the FDTD Subgridding Method. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-100007

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

19. Lin, Chih-Hsin. A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method.

Degree: Master, Communications Engineering, 2016, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0116116-115734

► When designers design products, they will avoid the distortion of signal as possible. However, they sometimes may make input signal propagate in unusual form. For… (more)

Subjects/Keywords: FDTD; Lebedev grid; anisotropic; Electromagnetic Interference

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lin, C. (2016). A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0116116-115734

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Chih-Hsin. “A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method.” 2016. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0116116-115734.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Chih-Hsin. “A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method.” 2016. Web. 27 Feb 2021.

Vancouver:

Lin C. A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0116116-115734.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin C. A Method of Combination of Yee Grid and Lebedev Grid to Analysis Anisotropic Materials with FDTD Method. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0116116-115734

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rochester Institute of Technology

20. Kawamura, Daiji. Investigating block mask lithography variation using finite-difference time-domain simulation.

Degree: Microelectronic Engineering, 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5538

► Simulation work has long been realized as a method for analyzing semiconductor processing expediently and cost-effectively. As technology advancements strive to meet increasingly stringent parameter… (more)

Subjects/Keywords: Block; FDTD; Kawamura; Lithography; Panoramic; Simulation

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APA (6^th Edition):

Kawamura, D. (2011). Investigating block mask lithography variation using finite-difference time-domain simulation. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5538

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kawamura, Daiji. “Investigating block mask lithography variation using finite-difference time-domain simulation.” 2011. Thesis, Rochester Institute of Technology. Accessed February 27, 2021. https://scholarworks.rit.edu/theses/5538.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kawamura, Daiji. “Investigating block mask lithography variation using finite-difference time-domain simulation.” 2011. Web. 27 Feb 2021.

Vancouver:

Kawamura D. Investigating block mask lithography variation using finite-difference time-domain simulation. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Feb 27]. Available from: https://scholarworks.rit.edu/theses/5538.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kawamura D. Investigating block mask lithography variation using finite-difference time-domain simulation. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/5538

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

21. Cao, Zhipeng. Advances In Simulation And Thermography For high Field Mri.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/18817

► High field MRI systems can benefit from increased signal-to-noise ratio (SNR) but face challenges of decreased homogeneity in signal intensity across images and increased patient… (more)

▼ High field MRI systems can benefit from increased signal-to-noise ratio (SNR) but face challenges of decreased homogeneity in signal intensity across images and increased patient heating. Currently, engineering studies for high field MRI involve modeling of human subjects and RF coils and calculating the MR relevant electromagnetic fields, as well as collecting experimental MR data to validate the simulation prediction. Presented here is a computer-based MRI system simulator developed to solve the Bloch equation with consideration of accurate electromagnetic fields calculated with finite-difference-time-domain (FDTD) method. It is demonstrated that the MRI system simulator can simulate many realistic MR phenomena. It bridges the gap between field simulation and experimental MR imaging, and can potentially facilitate the validation of new ideas by MR researchers. By utilizing the system simulator and an FDTD solver, an analysis of high field MRI performance at up to 14 Tesla with current standard transmission and reception methods has been performed. It is found that for imaging of the human head, depending on the imaging sequence used high field MRI could have more-than-linear increase in SNR and less-than-quadratic increase in energy dissipation in the subject. Finally, in order to explore the possibility of patient-specific temperature monitoring to ensure safety due to increased power deposition at high field, a novel compressed sensing reconstruction technique is presented to improve the acquisition speed of proton resonance frequency shift thermography. Advisors/Committee Members: Qing X Yang, Dissertation Advisor/Co-Advisor, Qing X Yang, Committee Chair/Co-Chair, Jesse Louis Barlow, Committee Member, Thomas Neuberger, Committee Member, William Joseph Weiss, Committee Member, Christopher Collins, Special Member, Mark Griswold, Special Member.

Subjects/Keywords: MRI; FDTD; Simulation; Hyperthermia; Reconstruction; Compressed Sensing

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APA (6^th Edition):

Cao, Z. (2013). Advances In Simulation And Thermography For high Field Mri. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/18817

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cao, Zhipeng. “Advances In Simulation And Thermography For high Field Mri.” 2013. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/18817.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cao, Zhipeng. “Advances In Simulation And Thermography For high Field Mri.” 2013. Web. 27 Feb 2021.

Vancouver:

Cao Z. Advances In Simulation And Thermography For high Field Mri. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/18817.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cao Z. Advances In Simulation And Thermography For high Field Mri. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/18817

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

22. Abdallah, Samer S. Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors.

Degree: 2007, University of Waterloo

URL: http://hdl.handle.net/10012/3373

► Recently, a novel optical imaging technique was successfully used in measuring the functional response of living retinal tissues. The technique, functional ultra high resolution optical… (more)

Subjects/Keywords: Photoreceptors; Scattering; FDTD

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APA (6^th Edition):

Abdallah, S. S. (2007). Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/3373

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Abdallah, Samer S. “Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors.” 2007. Thesis, University of Waterloo. Accessed February 27, 2021. http://hdl.handle.net/10012/3373.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Abdallah, Samer S. “Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors.” 2007. Web. 27 Feb 2021.

Vancouver:

Abdallah SS. Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors. [Internet] [Thesis]. University of Waterloo; 2007. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10012/3373.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Abdallah SS. Finite-Difference Time-Domain Simulations of Light Scattering from Retinal Photoreceptors. [Thesis]. University of Waterloo; 2007. Available from: http://hdl.handle.net/10012/3373

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Washington State University

23. [No author]. The Study of RF Burns and AMI Exposure Using the FDTD Method .

Degree: 2012, Washington State University

URL: http://hdl.handle.net/2376/4151

► One of my research topic is about the human body exposure to AMI. Power utilities are increasingly deploying residential meters that communicate wirelessly. These meters… (more)

▼ One of my research topic is about the human body exposure to AMI. Power utilities are increasingly deploying residential meters that communicate wirelessly. These meters may employ multiple antennas and radiate at different frequencies, ranging from 850 MHz to 2.4 GHz. Unlike radiofrequency (RF) exposure caused by cell phones, where the position of the phone relative to the body is somewhat fixed, the position of a power meter relative to the body is rather unconstrained. In this work we use the finite-difference time-domain (FDTD) method to study the specific absorption rate (SAR) produced in full anatomical models of humans when they are exposed to the RF fields produced by a wireless AMI meter. When one accounts for the meter's true duty cycle or there is a realistic separation between the meter and an individual, all SAR values fall within safety limits. Another topic of my research is about the RF burns. Both the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the Institute of Electrical and Electronics Engineers (IEEE) have maximum permissible exposure (MPE) guidelines that specify the limits on the magnitude of the electromagnetic (EM) fields and contact currents to which humans are allowed to be exposed. However, even when the fields do not exceed the ICNIRP or IEEE limits, a radio frequency (RF) burn may occur when a person is in contact with a perfect electric conductor (PEC). In this work we use the FDTD method and a full anatomical model to calculate the contact current density when a person is in contact with a PEC rod that is on order of 2 m in length. The effects of rod length, rod diameter, and the type of touch are considered. Frequencies are between 10 MHz and 600 MHz. A SubGridding technique in FDTD field was investigated as a topic in my thesis. The fundamental FDTD method is not well suited to model problems in which the structure of interest has important geometric features at greatly different scales. In order to study such "multiscale" problems, numerous modified FDTD algorithms have been proposed that incorporate a subgridding technique. In 2006, Berenger proposed a promising new technique known as the Huygens subgridding (HSG) method. However, this technique suffers from a late-time instabilities. In this work, we demonstrate how the judicious use of artificial loss can be used to control this instability. We also explore other aspects of the HSG method, such as the reflection coefficient, for various discretizations.

Subjects/Keywords: Electromagnetics; FDTD; RF Burn; SAR; Smart Meter

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APA (6^th Edition):

author], [. (2012). The Study of RF Burns and AMI Exposure Using the FDTD Method . (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/4151

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “The Study of RF Burns and AMI Exposure Using the FDTD Method .” 2012. Thesis, Washington State University. Accessed February 27, 2021. http://hdl.handle.net/2376/4151.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “The Study of RF Burns and AMI Exposure Using the FDTD Method .” 2012. Web. 27 Feb 2021.

Vancouver:

author] [. The Study of RF Burns and AMI Exposure Using the FDTD Method . [Internet] [Thesis]. Washington State University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2376/4151.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. The Study of RF Burns and AMI Exposure Using the FDTD Method . [Thesis]. Washington State University; 2012. Available from: http://hdl.handle.net/2376/4151

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Muller, Jérôme. Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation.

Degree: Docteur es, Mécanique et énergétique, 2011, Université Henri Poincaré – Nancy I

URL: http://www.theses.fr/2011NAN10082

►

De récentes études ont montré que les ondes électromagnétiques, proche d'une structure diffusante telle qu'une pointe de microscope à force atomique (AFM), peuvent être diffusées… (more)

▼

De récentes études ont montré que les ondes électromagnétiques, proche d'une structure diffusante telle qu'une pointe de microscope à force atomique (AFM), peuvent être diffusées et détectées en champ lointain. Ainsi, la détection d'ondes de surface par microscopie optique en champ proche (SNOM) est une technique prometteuse dans le cadre des mesures thermiques aux petites échelles. Une telle technologie prend alors le nom de microscope TRSTM (Thermal Radiation Scanning Tunnelling Microscopy).Le travail de thèse présenté dans ce manuscrit se scinde en deux étapes. La première a trait à nos travaux expérimentaux basés sur le montage d'un dispositif TRSTM. Nous en décrivons les différentes composantes, ainsi que les difficultés rencontrées liées à son fonctionnement. En outre, divers outils numériques, destinés à détecter et extraire tout signal périodique utile, sont développés. La seconde étape se concentre sur nos travaux numériques. Nous y proposons un modèle de diffusion d'ondes électromagnétiques basé sur la FDTD (Finite-Difference Time-Domain) et la transformation champ proche/champ lointain. Ce modèle a été validé par l'étude de dipôles, puis de sphères dispersives à proximité d'un substrat diélectrique. Alors, un certain nombre de simulations de diffusion d'ondes évanescentes par une pointe, de diverses formes et de divers matériaux, proche d'une interface, est présenté.

Recent studies have shown that electromagnetic waves (in particular the thermal radiation), in the vicinity of a scattering object such as en atomic force microscope (AFM), can be scattered from near to far-field and thus detected. The detection of surface waves through scanning near-field optical microscopy (SNOM) is a promising technique for thermal measurement at small scales. Such technology is known as TRSTM. The thesis work presented in this manuscript is divided into tow part. The first one relates to our experimental work based on the development of a TRSTM device. Its various components are detailed, and the difficulties observed during its utilization are described. Furthermore, several digital tools, used to detect and extract any useful signal, are presented. The second part of our work focuses on the development of a numerical model based on the finite-difference time-domain (FDTD) and the near-field to far-field (NFTFF) transformation for the scattering of electromagnetic waves. This model has been validated by studying different cases of dipoles and dispersive spheres close to a dielectric substrate. Then, several simulations of scattering of evanescent waves by a tip, with various shapes and materials, near an interface, are presented.

Advisors/Committee Members: Lacroix, David (thesis director), Parent, Gilles (thesis director).

Subjects/Keywords: Fdtd; Trstm; Snom; Rayonnement thermique; 502.82

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APA (6^th Edition):

Muller, J. (2011). Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation. (Doctoral Dissertation). Université Henri Poincaré – Nancy I. Retrieved from http://www.theses.fr/2011NAN10082

Chicago Manual of Style (16^th Edition):

Muller, Jérôme. “Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation.” 2011. Doctoral Dissertation, Université Henri Poincaré – Nancy I. Accessed February 27, 2021. http://www.theses.fr/2011NAN10082.

MLA Handbook (7^th Edition):

Muller, Jérôme. “Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation.” 2011. Web. 27 Feb 2021.

Vancouver:

Muller J. Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation. [Internet] [Doctoral dissertation]. Université Henri Poincaré – Nancy I; 2011. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2011NAN10082.

Council of Science Editors:

Muller J. Réalisation et modélisation d'un microscope à sonde locale appliqué à l'étude du rayonnement thermique en champ proche : Realization and modeling of a scanning probe microscope applied to the study of thermal near-field radiation. [Doctoral Dissertation]. Université Henri Poincaré – Nancy I; 2011. Available from: http://www.theses.fr/2011NAN10082

Syracuse University

25. Aydin, Gokhan. A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations.

Degree: PhD, Electrical Engineering and Computer Science, 2011, Syracuse University

URL: https://surface.syr.edu/eecs_etd/298

► In this dissertation, a set of general purpose single-field finite-difference time-domain updating equations for solving electromagnetic problems is derived. The formulation uses a single-field… (more)

Subjects/Keywords: FDTD; Single-Field; Vector wave equation; Engineering

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APA (6^th Edition):

Aydin, G. (2011). A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/eecs_etd/298

Chicago Manual of Style (16^th Edition):

Aydin, Gokhan. “A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations.” 2011. Doctoral Dissertation, Syracuse University. Accessed February 27, 2021. https://surface.syr.edu/eecs_etd/298.

MLA Handbook (7^th Edition):

Aydin, Gokhan. “A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations.” 2011. Web. 27 Feb 2021.

Vancouver:

Aydin G. A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations. [Internet] [Doctoral dissertation]. Syracuse University; 2011. [cited 2021 Feb 27]. Available from: https://surface.syr.edu/eecs_etd/298.

Council of Science Editors:

Aydin G. A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations. [Doctoral Dissertation]. Syracuse University; 2011. Available from: https://surface.syr.edu/eecs_etd/298

University of Toronto

26. Vairavanathan, Vinujanan. FDTD Characterization of Antenna-channel Interactions via Macromodeling.

Degree: 2010, University of Toronto

URL: http://hdl.handle.net/1807/24644

►

Modeling of radio wave propagation is indispensable for the design and analysis of wireless communication systems. The use of the Finite-Difference Time-Domain (FDTD) method for… (more)

Subjects/Keywords: Electromagnetics; FDTD method; Antenna macromodels; Reciprocity theorem

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APA (6^th Edition):

Vairavanathan, V. (2010). FDTD Characterization of Antenna-channel Interactions via Macromodeling. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/24644

Chicago Manual of Style (16^th Edition):

Vairavanathan, Vinujanan. “FDTD Characterization of Antenna-channel Interactions via Macromodeling.” 2010. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/24644.

MLA Handbook (7^th Edition):

Vairavanathan, Vinujanan. “FDTD Characterization of Antenna-channel Interactions via Macromodeling.” 2010. Web. 27 Feb 2021.

Vancouver:

Vairavanathan V. FDTD Characterization of Antenna-channel Interactions via Macromodeling. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/24644.

Council of Science Editors:

Vairavanathan V. FDTD Characterization of Antenna-channel Interactions via Macromodeling. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/24644

Boston College

27. Kong, Jiantao. Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering.

Degree: PhD, Physics, 2018, Boston College

URL: http://dlib.bc.edu/islandora/object/bc-ir:108243

► Nonlocal effects, the wavenumber dependence in a medium's response to external disturbance, is treated in this thesis. Numerical computation methods to include nonlocal effects in… (more)

▼ Nonlocal effects, the wavenumber dependence in a medium's response to external disturbance, is treated in this thesis. Numerical computation methods to include nonlocal effects in plasmonic nanostructures’ electromagnetic response are discussed, and applications of plasmonics to a few other fields are elaborated. First, a computation scheme is proposed to extend conventional finite-difference time-domain (FDTD) methods to nonlocal domain. An effective film whose response is derived from Feibelman's d-function formalism is to replace the highly non-uniform metal surfaces in simulations. It successfully produces numerical results of plasmonic resonance shift and field enhancement which agrees with the experimental data to first order. This scheme is still classical, thus very fast compared to the other first principle quantum methods such as density functional theory. Then electron's scattering rate in an effective medium with plasmonic nanostructures embedded-in, in random phase approximation, is developed, with the wavenumber dependence in the medium’s response accounted. Utilizing this calculation scheme of electron’s scattering rate, further specific applications are following. We show by simulation of the plasmonic nanostructures and calculation of the electron scattering rates that hot-electron plasmon-protection (HELPP) effects can protect the extra energy of hot electrons from being dissipated as heat. This can be a prototype of the 3rd generation solar cells. In another application, we investigate the electron polar-optical-phonon (POP) scattering in heavily-doped semiconductors when plasmonic nanostructures are embedded-in. We show that electron-POP scattering can be significantly suppressed compared to that of bulk semiconductors. In the third application, we propose the plasmonic multiple exciton generation (PMEG) scheme, with simulations and calculations, showing that the efficiency of multiple exciton generation in conventional semiconductors could be enhanced significantly with proper designed plasmonic nanostructures embedded-in or attached-adjacent. Advisors/Committee Members: Krzysztof Kempa (Thesis advisor).

Subjects/Keywords: Electron Scattering; FDTD; Nanostructures; Nonlocal Effects; Plasmonics

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APA (6^th Edition):

Kong, J. (2018). Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:108243

Chicago Manual of Style (16^th Edition):

Kong, Jiantao. “Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering.” 2018. Doctoral Dissertation, Boston College. Accessed February 27, 2021. http://dlib.bc.edu/islandora/object/bc-ir:108243.

MLA Handbook (7^th Edition):

Kong, Jiantao. “Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering.” 2018. Web. 27 Feb 2021.

Vancouver:

Kong J. Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering. [Internet] [Doctoral dissertation]. Boston College; 2018. [cited 2021 Feb 27]. Available from: http://dlib.bc.edu/islandora/object/bc-ir:108243.

Council of Science Editors:

Kong J. Nonlocal Effects in Plasmonic Nanostructures’ Optical Response and Electron Scattering. [Doctoral Dissertation]. Boston College; 2018. Available from: http://dlib.bc.edu/islandora/object/bc-ir:108243

Portland State University

28. Higgins, James Alexander. Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications.

Degree: MS(M.S.) in Electrical and Computer Engineering, Electrical and Computer Engineering, 2012, Portland State University

URL: https://pdxscholar.library.pdx.edu/open_access_etds/867

► The THz region is a burgeoning field of research with applications in spectroscopy, integrated circuit fabrication, bio-medicine, and communications. Until recently, the THz region… (more)

▼ The THz region is a burgeoning field of research with applications in spectroscopy, integrated circuit fabrication, bio-medicine, and communications. Until recently, the THz region was largely unexplored, mainly due to the technical difficulties involved in making efficient and compact sources and detectors. As these challenges are addressed, the focus of research has shifted to practical applications, such as sensing and imaging. The focus of this thesis is to investigate the characterization of parallel plate waveguide multimode propagation and periodically notched resonant structures for use in sensing and material parameter extraction applications. Broadband and narrowband measurements are presented and analyzed. Measurements are compared to finite difference time domain simulations and analytic solutions that use a Fourier transform mode-matching technique. Agreement is observed between simulation and measurement of radiation patterns. Weighted estimates of individual mode analytic solutions produce equivalent radiation patterns, which allows insight into the energy coupled into each respective mode. Results show that higher order modes contribute both a greater conductive attenuation and higher coupling loss. Agreement is also observed between measurements and simulated single and periodically notched resonant structures. Results demonstrate shifting of the resonant peak with respect to changes in plate separation for the periodically notched structure. For the single notch resonator, simulations indicate the resonant peak is dependent on notch depth until the depth-to-width ratio is greater than two. This work demonstrates that multimode propagation can be identified and the amount of energy coupled into each mode may be estimated using radiation patterns. Experiments using quasi-optical time domain spectroscopic and continuous wave vector network analyzer systems in the THz region have been demonstrated. Finite difference time domain simulations have validated measurements on both systems. The results presented will advance the field of THz research by aiding in the design and analysis of sensing and material parameter extraction systems Advisors/Committee Members: Branimir Pejcinovic.

Subjects/Keywords: Electromagnetism; FDTD Simulation; Multimode parallel plate waveguide

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APA (6^th Edition):

Higgins, J. A. (2012). Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications. (Masters Thesis). Portland State University. Retrieved from https://pdxscholar.library.pdx.edu/open_access_etds/867

Chicago Manual of Style (16^th Edition):

Higgins, James Alexander. “Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications.” 2012. Masters Thesis, Portland State University. Accessed February 27, 2021. https://pdxscholar.library.pdx.edu/open_access_etds/867.

MLA Handbook (7^th Edition):

Higgins, James Alexander. “Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications.” 2012. Web. 27 Feb 2021.

Vancouver:

Higgins JA. Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications. [Internet] [Masters thesis]. Portland State University; 2012. [cited 2021 Feb 27]. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/867.

Council of Science Editors:

Higgins JA. Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications. [Masters Thesis]. Portland State University; 2012. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/867

University of Toronto

29. Kogon, Aaron J. Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method.

Degree: 2020, University of Toronto

URL: http://hdl.handle.net/1807/103134

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Infinitely-periodic geometries are efficiently modelled in the finite-difference time-domain (FDTD) method using periodic boundary conditions (PBCs). Several PBC implementations operate by maintaining a constant wave… (more)

Subjects/Keywords: Edge effects; FDTD; Finite periodic structures; 0607

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kogon, A. J. (2020). Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/103134

Chicago Manual of Style (16^th Edition):

Kogon, Aaron J. “Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method.” 2020. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/103134.

MLA Handbook (7^th Edition):

Kogon, Aaron J. “Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method.” 2020. Web. 27 Feb 2021.

Vancouver:

Kogon AJ. Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method. [Internet] [Masters thesis]. University of Toronto; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/103134.

Council of Science Editors:

Kogon AJ. Efficient Simulation of Driven Finite Periodic Structures using the Finite-difference Time-domain Method. [Masters Thesis]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/103134

University of Manchester

30. Hu, Runze. UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY.

Degree: 2020, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:326058

► In computational electromagnetics (EM), the accuracy of the numerical simulation is compromised by randomness which may arise in various forms such as electric parameters and… (more)

▼ In computational electromagnetics (EM), the accuracy of the numerical simulation is compromised by randomness which may arise in various forms such as electric parameters and input sources. Though EM problems are usually treated as deterministic, there exist many instances where some input parameters of EM simulators cannot be strictly determined due to limited knowledge regarding these parameters. The ambiguity of input parameters causes a degree of uncertainty in the responses of the system. In order to gain an understanding of the reliability of numerical simulations, the possible uncertainty together with the system response can be investigated. This thesis aims at quantifying the uncertainty of the finite-difference time-domain (FDTD) simulation induced by the uncertainty of input parameters, which is known as forward uncertainty quantification (UQ) or the uncertainty propagation problem. The Monte Carlo method (MCM) is the traditional technique utilised in UQ, yet it requires a considerable number of FDTD simulations, leading to excessive computational resources. In order to reduce the computational cost of UQ for the FDTD simulation, a series of UQ techniques, such as the stochastic collocation method and the non-intrusive polynomial chaos (NIPC) expansion method, have been investigated. In comparison to other UQ techniques, the NIPC method demonstrates high accuracy and computational efficiency. However, this method suffers from the curse of dimensionality whereby the number of required FDTD simulations grows substantially when the number of uncertain parameters increases. To lift the curse of dimensionality, the sparse schemes including the hyperbolic scheme and the least angle regression (LARS) method were also studied. Furthermore, this thesis investigated machine learning techniques for UQ. An artificial neural network based UQ method was proposed to quantify the uncertainty of the FDTD response. This method builds a surrogate model for the 11 FDTD simulation, and thus bypassing the thousands of system-runs required in the MCM. The proposed method has the potential to significantly reduce the computational cost of UQ, which could be of significant use within the bioelectromagnetics field. Advisors/Committee Members: ALSUSA, EMAD EA, Costen, Fumie, Alsusa, Emad.

Subjects/Keywords: Finite-difference Time-domain (FDTD); Uncertainty quantification

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hu, R. (2020). UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:326058

Chicago Manual of Style (16^th Edition):

Hu, Runze. “UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY.” 2020. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:326058.

MLA Handbook (7^th Edition):

Hu, Runze. “UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY.” 2020. Web. 27 Feb 2021.

Vancouver:

Hu R. UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY. [Internet] [Doctoral dissertation]. University of Manchester; 2020. [cited 2021 Feb 27]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:326058.

Council of Science Editors:

Hu R. UNCERTAINTY QUANTIFICATION FOR FD-FDTD COMPUTATIONS FOR THE HUMAN BODY. [Doctoral Dissertation]. University of Manchester; 2020. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:326058

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