subject:(Electromagnetics AND Photonics)

1. Kattel, Bibek. Evaluation of wireless router antennas and 3d-printed simulated antenna designs.

Degree: M.S. in Engineering Science, Engineering Science, 2019, University of Mississippi

URL: https://egrove.olemiss.edu/etd/1769

► As the size of the electronics devices is decreasing the overall size of the antenna inside them is also decreasing. As the antenna size becomes… (more)

Subjects/Keywords: Electromagnetics; Electromagnetics and Photonics

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APA (6^th Edition):

Kattel, B. (2019). Evaluation of wireless router antennas and 3d-printed simulated antenna designs. (Thesis). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/1769

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):

Kattel, Bibek. “Evaluation of wireless router antennas and 3d-printed simulated antenna designs.” 2019. Thesis, University of Mississippi. Accessed February 26, 2021. https://egrove.olemiss.edu/etd/1769.

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

MLA Handbook (7^th Edition):

Kattel, Bibek. “Evaluation of wireless router antennas and 3d-printed simulated antenna designs.” 2019. Web. 26 Feb 2021.

Vancouver:

Kattel B. Evaluation of wireless router antennas and 3d-printed simulated antenna designs. [Internet] [Thesis]. University of Mississippi; 2019. [cited 2021 Feb 26]. Available from: https://egrove.olemiss.edu/etd/1769.

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

Council of Science Editors:

Kattel B. Evaluation of wireless router antennas and 3d-printed simulated antenna designs. [Thesis]. University of Mississippi; 2019. Available from: https://egrove.olemiss.edu/etd/1769

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

2. Garner, Thomas S. Automation of data collection from an anechoic chamber.

Degree: M.S. in Engineering Science, Engineering Science, 2019, University of Mississippi

URL: https://egrove.olemiss.edu/etd/1790

► This paper describes the calibration methods and the process that is used on the Ole Miss electrical engineering anechoic chamber. Furthermore the MATLAB code that… (more)

Subjects/Keywords: Electromagnetics; Electromagnetics and Photonics

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APA (6^th Edition):

Garner, T. S. (2019). Automation of data collection from an anechoic chamber. (Thesis). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/1790

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):

Garner, Thomas S. “Automation of data collection from an anechoic chamber.” 2019. Thesis, University of Mississippi. Accessed February 26, 2021. https://egrove.olemiss.edu/etd/1790.

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

MLA Handbook (7^th Edition):

Garner, Thomas S. “Automation of data collection from an anechoic chamber.” 2019. Web. 26 Feb 2021.

Vancouver:

Garner TS. Automation of data collection from an anechoic chamber. [Internet] [Thesis]. University of Mississippi; 2019. [cited 2021 Feb 26]. Available from: https://egrove.olemiss.edu/etd/1790.

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

Council of Science Editors:

Garner TS. Automation of data collection from an anechoic chamber. [Thesis]. University of Mississippi; 2019. Available from: https://egrove.olemiss.edu/etd/1790

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

3. Hunsicker, Walker F. Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays.

Degree: PhD, Electrical Engineering, 2014, University of Mississippi

URL: https://egrove.olemiss.edu/etd/982

► Light-weight phased array antennas for aerospace and mobile applications require utilizing the same antenna aperture to provide multiple functions with dissimilar radiation pattern specifications (e.g.,… (more)

Subjects/Keywords: Electromagnetics and Photonics

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APA (6^th Edition):

Hunsicker, W. F. (2014). Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays. (Doctoral Dissertation). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/982

Chicago Manual of Style (16^th Edition):

Hunsicker, Walker F. “Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays.” 2014. Doctoral Dissertation, University of Mississippi. Accessed February 26, 2021. https://egrove.olemiss.edu/etd/982.

MLA Handbook (7^th Edition):

Hunsicker, Walker F. “Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays.” 2014. Web. 26 Feb 2021.

Vancouver:

Hunsicker WF. Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays. [Internet] [Doctoral dissertation]. University of Mississippi; 2014. [cited 2021 Feb 26]. Available from: https://egrove.olemiss.edu/etd/982.

Council of Science Editors:

Hunsicker WF. Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays. [Doctoral Dissertation]. University of Mississippi; 2014. Available from: https://egrove.olemiss.edu/etd/982

4. Liu, Qi. A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables.

Degree: M.S. in Engineering Science, Electrical Engineering, 2014, University of Mississippi

URL: https://egrove.olemiss.edu/etd/1299

► Use of the complex-envelope (CE) representation of band-pass limited sources and their resulting fields increases the allowable time-step in finite-difference time-domain (FDTD) simulations. The complex… (more)

Subjects/Keywords: Electromagnetics and Photonics

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APA (6^th Edition):

Liu, Q. (2014). A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables. (Thesis). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/1299

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):

Liu, Qi. “A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables.” 2014. Thesis, University of Mississippi. Accessed February 26, 2021. https://egrove.olemiss.edu/etd/1299.

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

MLA Handbook (7^th Edition):

Liu, Qi. “A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables.” 2014. Web. 26 Feb 2021.

Vancouver:

Liu Q. A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables. [Internet] [Thesis]. University of Mississippi; 2014. [cited 2021 Feb 26]. Available from: https://egrove.olemiss.edu/etd/1299.

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

Council of Science Editors:

Liu Q. A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables. [Thesis]. University of Mississippi; 2014. Available from: https://egrove.olemiss.edu/etd/1299

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

Lehigh University

5. Wu, Jiaheng. Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications.

Degree: MS, Photonics, 2019, Lehigh University

URL: https://preserve.lehigh.edu/etd/5805

In this thesis, general fundamentals and background knowledge of subwavelength gratings (SWGs) and their potential applications are introduced. SWGs targeting the infrared regime can greatly improve efficiency for potential applications, such as optical c Advisors/Committee Members: Chao Zhou.

Subjects/Keywords: Electromagnetics and Photonics

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APA (6^th Edition):

Wu, J. (2019). Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications. (Thesis). Lehigh University. Retrieved from https://preserve.lehigh.edu/etd/5805

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):

Wu, Jiaheng. “Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications.” 2019. Thesis, Lehigh University. Accessed February 26, 2021. https://preserve.lehigh.edu/etd/5805.

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

MLA Handbook (7^th Edition):

Wu, Jiaheng. “Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications.” 2019. Web. 26 Feb 2021.

Vancouver:

Wu J. Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications. [Internet] [Thesis]. Lehigh University; 2019. [cited 2021 Feb 26]. Available from: https://preserve.lehigh.edu/etd/5805.

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

Council of Science Editors:

Wu J. Computational Study of GaN-Based Subwavelength Gratings for Infrared Applications. [Thesis]. Lehigh University; 2019. Available from: https://preserve.lehigh.edu/etd/5805

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

6. Inman, Matthew Joseph. Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods.

Degree: PhD, Electrical Engineering, 2013, University of Mississippi

URL: https://egrove.olemiss.edu/etd/528

► The use of Graphical Processing Units (GPU's) for scientific applications has been evolving and expanding for the decade. GPU's provide an alternative to the CPU… (more)

Subjects/Keywords: Acceleration; Electromagnetics; Gpu; Electromagnetics and Photonics

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APA (6^th Edition):

Inman, M. J. (2013). Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods. (Doctoral Dissertation). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/528

Chicago Manual of Style (16^th Edition):

Inman, Matthew Joseph. “Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods.” 2013. Doctoral Dissertation, University of Mississippi. Accessed February 26, 2021. https://egrove.olemiss.edu/etd/528.

MLA Handbook (7^th Edition):

Inman, Matthew Joseph. “Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods.” 2013. Web. 26 Feb 2021.

Vancouver:

Inman MJ. Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods. [Internet] [Doctoral dissertation]. University of Mississippi; 2013. [cited 2021 Feb 26]. Available from: https://egrove.olemiss.edu/etd/528.

Council of Science Editors:

Inman MJ. Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods. [Doctoral Dissertation]. University of Mississippi; 2013. Available from: https://egrove.olemiss.edu/etd/528

University of Central Florida

7. Zhao, Jian. Imaging through Glass-air Anderson Localizing Optical Fiber.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6598

► The fiber-optic imaging system enables imaging deeply into hollow tissue tracts or organs of biological objects in a minimally invasive way, which are inaccessible to… (more)

▼ The fiber-optic imaging system enables imaging deeply into hollow tissue tracts or organs of biological objects in a minimally invasive way, which are inaccessible to conventional microscopy. It is the key technology to visualize biological objects in biomedical research and clinical applications. The fiber-optic imaging system should be able to deliver a high-quality image to resolve the details of cell morphology in vivo and in real time with a miniaturized imaging unit. It also has to be insensitive to environmental perturbations, such as mechanical bending or temperature variations. Besides, both coherent and incoherent light sources should be compatible with the imaging system. It is extremely challenging for current technologies to address all these issues simultaneously. The limitation mainly lies in the deficient stability and imaging capability of fiber-optic devices and the limited image reconstruction capability of algorithms. To address these limitations, we first develop the randomly disordered glass-air optical fiber featuring a high air-filling fraction (~28.5 %) and low loss (~1 dB per meter) at visible wavelengths. Due to the transverse Anderson localization effect, the randomly disordered structure can support thousands of modes, most of which demonstrate single-mode properties. By making use of these modes, the randomly disordered optical fiber provides a robust and low-loss imaging system which can transport images with higher quality than the best commercially available imaging fiber. We further demonstrate that deep-learning algorithm can be applied to the randomly disordered optical fiber to overcome the physical limitation of the fiber itself. At the initial stage, a laser-illuminated system is built by integrating a deep convolutional neural network with the randomly disordered optical fiber. Binary sparse objects, such as handwritten numbers and English letters, are collected, transported and reconstructed using this system. It is proved that this first deep-learning-based fiber imaging system can perform artifact-free, lensless and bending-independent imaging at variable working distances. In real-world applications, the gray-scale biological subjects have much more complicated features. To image biological tissues, we re-design the architecture of the deep convolutional neural network and apply it to a newly designed system using incoherent illumination. The improved fiber imaging system has much higher resolution and faster reconstruction speed. We show that this new system can perform video-rate, artifact-free, lensless cell imaging. The cell imaging process is also remarkably robust with regard to mechanical bending and temperature variations. In addition, this system demonstrates stronger transfer-learning capability than existed deep-learning-based fiber imaging system. Advisors/Committee Members: Schulzgen, Axel.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Zhao, J. (2019). Imaging through Glass-air Anderson Localizing Optical Fiber. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6598

Chicago Manual of Style (16^th Edition):

Zhao, Jian. “Imaging through Glass-air Anderson Localizing Optical Fiber.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6598.

MLA Handbook (7^th Edition):

Zhao, Jian. “Imaging through Glass-air Anderson Localizing Optical Fiber.” 2019. Web. 26 Feb 2021.

Vancouver:

Zhao J. Imaging through Glass-air Anderson Localizing Optical Fiber. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6598.

Council of Science Editors:

Zhao J. Imaging through Glass-air Anderson Localizing Optical Fiber. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6598

University of Central Florida

8. Guzman Sepulveda, Jose Rafael. Optical Sensing of Structural Dynamics in Complex Media.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6872

► Quantifying the structural dynamics of complex media is challenging because of the multiple temporal and spatial scales involved. Thanks to the ability to retrieve collective… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Guzman Sepulveda, J. R. (2019). Optical Sensing of Structural Dynamics in Complex Media. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6872

Chicago Manual of Style (16^th Edition):

Guzman Sepulveda, Jose Rafael. “Optical Sensing of Structural Dynamics in Complex Media.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6872.

MLA Handbook (7^th Edition):

Guzman Sepulveda, Jose Rafael. “Optical Sensing of Structural Dynamics in Complex Media.” 2019. Web. 26 Feb 2021.

Vancouver:

Guzman Sepulveda JR. Optical Sensing of Structural Dynamics in Complex Media. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6872.

Council of Science Editors:

Guzman Sepulveda JR. Optical Sensing of Structural Dynamics in Complex Media. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6872

University of Central Florida

9. Zhu, Zheyuan. Computational Imaging with Limited Photon Budget.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6864

► The capability of retrieving the image/signal of interest from extremely low photon flux is attractive in scientific, industrial, and medical imaging applications. Conventional imaging modalities… (more)

▼ The capability of retrieving the image/signal of interest from extremely low photon flux is attractive in scientific, industrial, and medical imaging applications. Conventional imaging modalities and reconstruction algorithms rely on hundreds to thousands of photons per pixel (or per measurement) to ensure enough signal-to-noise (SNR) ratio for extracting the image/signal of interest. Unfortunately, the potential of radiation or photon damage prohibits high SNR measurements in dose-sensitive diagnosis scenarios. In addition, imaging systems utilizing inherently weak signals as contrast mechanism, such as X-ray scattering-based tomography, or attosecond pulse retrieval from the streaking trace, entail prolonged integration time to acquire hundreds of photons, thus rendering high SNR measurement impractical. This dissertation addresses the problem of imaging from limited photon budget when high SNR measurements are either prohibitive or impractical. A statistical image reconstruction framework based on the knowledge of the image-formation process and the noise model of the measurement system has been constructed and successfully demonstrated on two imaging platforms – photon-counting X-ray imaging, and attosecond pulse retrieval. For photon-counting X-ray imaging, the statistical image reconstruction framework achieves high-fidelity X-ray projection and tomographic image reconstruction from as low as 16 photons per pixel on average. The capability of our framework in modeling the reconstruction error opens the opportunity of designing the optimal strategies to distribute a fixed photon budget for region-of-interest (ROI) reconstruction, paving the way for radiation dose management in an imaging-specific task. For attosecond pulse retrieval, a learning-based framework has been incorporated into the statistical image reconstruction to retrieve the attosecond pulses from the noisy streaking traces. Quantitative study on the required signal-to-noise ratio for satisfactory pulse retrieval enabled by our framework provides a guideline to future attosecond streaking experiments. In addition, resolving the ambiguities in the streaking process due to the carrier envelop phase has also been demonstrated with our statistical reconstruction framework. Advisors/Committee Members: Pang, Sean.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Zhu, Z. (2019). Computational Imaging with Limited Photon Budget. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6864

Chicago Manual of Style (16^th Edition):

Zhu, Zheyuan. “Computational Imaging with Limited Photon Budget.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6864.

MLA Handbook (7^th Edition):

Zhu, Zheyuan. “Computational Imaging with Limited Photon Budget.” 2019. Web. 26 Feb 2021.

Vancouver:

Zhu Z. Computational Imaging with Limited Photon Budget. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6864.

Council of Science Editors:

Zhu Z. Computational Imaging with Limited Photon Budget. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6864

University of New Mexico

10. Behzadi, Behsan. NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS.

Degree: Optical Science and Engineering, 2018, University of New Mexico

URL: https://digitalrepository.unm.edu/ose_etds/62

► The mid-infrared (2-14 μm) spectral region contains the strong absorption lines of many important molecular species, which make this region crucial for several well-know… (more)

▼ The mid-infrared (2-14 μm) spectral region contains the strong absorption lines of many important molecular species, which make this region crucial for several well-know applications such as spectroscopy, chemical and biochemical sensing, security, and industrial monitoring. To fully exploit this region through absorption spectroscopic techniques, compact and low-cost narrow-linewidth (NLW) mid-infrared (MIR) laser sources are of primary importance. This thesis is focused on three novel compact NLW MIR lasers: demonstration and characterization of a new glass-based spherical microlaser, investigation of the performance of a novel fiber laser, and the design of a monolithic laser on a silicon chip. Starting with fabrication of spherical microcavities based on MIR transparent materials, I showed the feasibility of achieving quality factors of more than 10 million in whispering- gallery mode (WGM) microresonators made of different types of fluoride glasses. Next using Erbium doped ZBLAN glass spherical microresonators, I demonstrated a new ultra- low threshold NLW MIR microlaser. In particular, all aspects of this room temperature continuous-wave (CW) microlaser with a wavelength of 2.71 μm are carefully characterized and studied and the origin of the measured mode structure and polarization is described using a simple analysis. To amplify the output power of this laser, I designed and fabricated a MIR fiber amplifier with a record gain of about 30 dB at 2.71 μm that facilitated the characterization process and boosted the MIR power level to usable level while preserving the laser linewidth. To demonstrate the application of MIR microresonators and microlasers, I studied intracavity absorption spectroscopy based on active and passive high quality WGM MIR microlasers and microresonators. I also estimated the sensitivity and detection limit of gas sensors based on these devices. The outcome of my analysis shows that ppm level sensitivity should be achievable using both active and passive microresonators. Next, I modeled the performance of two newly proposed configurations for NLW MIR generation based on stimulated Raman scattering. First, I studied a new family of Raman fiber lasers that are capable of generating any NLW MIR line in the 2.5-9.5 μm spectral region. I demonstrated the feasibility of this MIR laser family, calculated the threshold conditions, identified the condition for its single-mode operation, and laid the foundation for the first experimental demonstration of such lasers. Finally, I explored the performance of silicon-based on-chip Raman lasers and the parameters that have prevented expanding their wavelength to MIR range. Using the outcomes of this study, I proposed and then analyzed a new architecture for on-chip silicon Raman lasers capable of generating single NLW lines around 3.2 μm with sub-mW threshold pump power. Advisors/Committee Members: Mani Hossein-Zadeh, Ravinder K. Jain, Jean-Claude Diels, Ganesh Balakrishnan.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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

APA (6^th Edition):

Behzadi, B. (2018). NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS. (Doctoral Dissertation). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/ose_etds/62

Chicago Manual of Style (16^th Edition):

Behzadi, Behsan. “NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS.” 2018. Doctoral Dissertation, University of New Mexico. Accessed February 26, 2021. https://digitalrepository.unm.edu/ose_etds/62.

MLA Handbook (7^th Edition):

Behzadi, Behsan. “NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS.” 2018. Web. 26 Feb 2021.

Vancouver:

Behzadi B. NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS. [Internet] [Doctoral dissertation]. University of New Mexico; 2018. [cited 2021 Feb 26]. Available from: https://digitalrepository.unm.edu/ose_etds/62.

Council of Science Editors:

Behzadi B. NOVEL COMPACT NARROW-LINEWIDTH MID-INFRARED LASERS FOR SENSING APPLICATIONS. [Doctoral Dissertation]. University of New Mexico; 2018. Available from: https://digitalrepository.unm.edu/ose_etds/62

University of Central Florida

11. Chen, Haiwei. Advanced liquid crystal displays with supreme image qualities.

Degree: 2017, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5698

► Several metrics are commonly used to evaluate the performance of display devices. In this dissertation, we analyze three key parameters: fast response time, wide color… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Chen, H. (2017). Advanced liquid crystal displays with supreme image qualities. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5698

Chicago Manual of Style (16^th Edition):

Chen, Haiwei. “Advanced liquid crystal displays with supreme image qualities.” 2017. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5698.

MLA Handbook (7^th Edition):

Chen, Haiwei. “Advanced liquid crystal displays with supreme image qualities.” 2017. Web. 26 Feb 2021.

Vancouver:

Chen H. Advanced liquid crystal displays with supreme image qualities. [Internet] [Doctoral dissertation]. University of Central Florida; 2017. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5698.

Council of Science Editors:

Chen H. Advanced liquid crystal displays with supreme image qualities. [Doctoral Dissertation]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/5698

University of Central Florida

12. Luo, Zhenyue. High Efficiency and Wide Color Gamut Liquid Crystal Displays.

Degree: 2015, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5017

► Liquid crystal display (LCD) has become ubiquitous and indispensable in our daily life. Recently, it faces strong competition from organic light emitting diode (OLED).… (more)

▼ Liquid crystal display (LCD) has become ubiquitous and indispensable in our daily life. Recently, it faces strong competition from organic light emitting diode (OLED). In order to maintain a strong leader position, LCD camp has an urgent need to enrich the color performance and reduce the power consumption. This dissertation focuses on solving these two emerging and important challenges. In the first part of the dissertation we investigate the quantum dot (QD) technology to improve the both the color gamut and the light efficiency of LCD. QD emits saturated color and grants LCD the capability to reproduce color vivid images. Moreover, the QD emission spectrum can be custom designed to match to transmission band of color filters. To fully take advantage of QD’s unique features, we propose a systematic modelling of the LCD backlight and optimize the QD spectrum to simultaneously maximize the color gamut and light efficiency. Moreover, QD enhanced LCD demonstrates several advantages: excellent ambient contrast, negligible color shift and controllable white point. Besides three primary LCD, We also present a spatiotemporal four-primary QD enhanced LCD. The LCD’s color is generated partially from time domain and partially from spatial domain. As a result, this LCD mode offers 1.5× increment in spatial resolution, 2× brightness enhancement, slightly larger color gamut and mitigated LC response requirement (~4ms). It can be employed in the commercial TV to meet the challenging Energy star 6 regulation. Besides conventional LCD, we also extend the QD applications to liquid displays and smart lighting devices. The second part of this dissertation focuses on improving the LCD light efficiency. Conventional LCD system has fairly low light efficiency (4%~7%) since polarizers and color filters absorb 50% and 67% of the incoming light respectively. We propose two approaches to reduce the light loss within polarizers and color filters. The first method is a polarization preserving backlight system. It can be combined with linearly polarized light source to boost the LCD efficiency. Moreover, this polarization preserving backlight offers high polarization efficiency (~77.8%), 2.4× on-axis luminance enhancement, and no need for extra optics films. The second approach is a LCD backlight system with simultaneous color/polarization recycling. We design a novel polarizing color filter with high transmittance (>90%), low absorption loss (~3.3%), high extinction ratio (>10,000:1) and large angular tolerance (up to ±50˚). This polarizing color filter can be used in LCD system to introduce the color/polarization recycling and accordingly boost LCD efficiency by ~3 times. These two approaches open new gateway for ultra-low power LCDs. In the final session of this dissertation, we demonstrate a low power and color vivid reflective liquid crystal on silicon (LCOS) display with low viscosity liquid crystal mixture. Compared with commercial LC material, the new LC mixture offers ~4X faster response at 20 °C and ~8X faster response at -20 °C.… Advisors/Committee Members: Wu, Shin-Tson.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Luo, Z. (2015). High Efficiency and Wide Color Gamut Liquid Crystal Displays. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5017

Chicago Manual of Style (16^th Edition):

Luo, Zhenyue. “High Efficiency and Wide Color Gamut Liquid Crystal Displays.” 2015. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5017.

MLA Handbook (7^th Edition):

Luo, Zhenyue. “High Efficiency and Wide Color Gamut Liquid Crystal Displays.” 2015. Web. 26 Feb 2021.

Vancouver:

Luo Z. High Efficiency and Wide Color Gamut Liquid Crystal Displays. [Internet] [Doctoral dissertation]. University of Central Florida; 2015. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5017.

Council of Science Editors:

Luo Z. High Efficiency and Wide Color Gamut Liquid Crystal Displays. [Doctoral Dissertation]. University of Central Florida; 2015. Available from: https://stars.library.ucf.edu/etd/5017

University of Central Florida

13. Kagalwala, Kumel. Entanglement and Coherence in Classical and Quantum Optics.

Degree: 2015, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5150

► We explore the concepts of coherence and entanglement as they apply to both the classical and quantum natures of light. In the classical domain,… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Kagalwala, K. (2015). Entanglement and Coherence in Classical and Quantum Optics. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5150

Chicago Manual of Style (16^th Edition):

Kagalwala, Kumel. “Entanglement and Coherence in Classical and Quantum Optics.” 2015. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5150.

MLA Handbook (7^th Edition):

Kagalwala, Kumel. “Entanglement and Coherence in Classical and Quantum Optics.” 2015. Web. 26 Feb 2021.

Vancouver:

Kagalwala K. Entanglement and Coherence in Classical and Quantum Optics. [Internet] [Doctoral dissertation]. University of Central Florida; 2015. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5150.

Council of Science Editors:

Kagalwala K. Entanglement and Coherence in Classical and Quantum Optics. [Doctoral Dissertation]. University of Central Florida; 2015. Available from: https://stars.library.ucf.edu/etd/5150

University of Central Florida

14. Rao, Ashutosh. Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon.

Degree: 2018, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5836

► Ion-sliced thin-film lithium niobate (LN) compact waveguide technology has facilitated the resurgence of integrated photonics based on lithium niobate. These thin-film LN waveguides offer over… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Rao, A. (2018). Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5836

Chicago Manual of Style (16^th Edition):

Rao, Ashutosh. “Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon.” 2018. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5836.

MLA Handbook (7^th Edition):

Rao, Ashutosh. “Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon.” 2018. Web. 26 Feb 2021.

Vancouver:

Rao A. Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon. [Internet] [Doctoral dissertation]. University of Central Florida; 2018. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5836.

Council of Science Editors:

Rao A. Thin-film Lithium Niobate Photonics for Electro-optics, Nonlinear Optics, and Quantum Optics on Silicon. [Doctoral Dissertation]. University of Central Florida; 2018. Available from: https://stars.library.ucf.edu/etd/5836

University of Central Florida

15. Xu, Daming. Advanced Blue Phase Liquid Crystal Displays.

Degree: 2016, University of Central Florida

URL: https://stars.library.ucf.edu/etd/4926

► Thin-film transistor (TFT) liquid crystal displays (LCDs) have become indispensable in our daily lives. Their widespread applications range from smartphones, laptops, TVs to navigational devices,… (more)

▼ Thin-film transistor (TFT) liquid crystal displays (LCDs) have become indispensable in our daily lives. Their widespread applications range from smartphones, laptops, TVs to navigational devices, data projectors and wearable displays. Over past decades, massive efforts have been invested in device development, material characterization and manufacturing technology. As a result, the performance of LCDs, such as viewing angle, contrast ratio, color gamut and resolution, have been improved significantly. Nonetheless, there are still urgent needs for fast response time and low power consumption. Fast response time helps reduce motion image blurs and enable color sequential displays. The latter is particularly attractive since it eliminates spatial color filters, which in turn triples optical efficiency and resolution density. The power consumption can be reduced greatly by using color sequential displays, but liquid crystals with submillisecond response time are required to minimize color breakup. The state-of-the-art gray-to-gray response time of nematic LCDs is about 5ms, which is too slow to meet this requirement. With the urgent needs for submillisecond response time, polymer-stabilized blue phase liquid crystal is emerging as a strong candidate for achieving this goal. Compared to conventional nematic LCDs, blue phase LCDs exhibit several revolutionary features: submillisecond gray-to-gray response time, no need for alignment layer, optically isotropic voltage-off state, and large cell gap tolerance. However, some bottlenecks such as high operation voltage, low optical transmittance, noticeable hysteresis and slow TFT charging remain to be overcome before their widespread applications can be realized. This dissertation is dedicated to addressing these challenges from material development and device design viewpoints. First, we started to investigate the device physics of blue phase LCDs. We have built a numerical model based on the refraction effect for simulating the electro-optics of blue phase devices. The model well agrees with experimental data. Based on this model, we explored approaches from device and material viewpoints to achieve low operation voltage. On the device side, with protrusion and etched electrodes, we can reduce the operating voltage to below 10V and enhance the transmittance to over 80%. On the material side, high Kerr constant is indeed helpful for lowering the operation voltage, but we also need to pay attention to the individual ?n and ?? values of liquid crystal host according to the device structures employed. High-?? LC hosts help enhance Kerr constant, leading to a reduced operation voltage; but they may be subject to serious capacitance charging issues due to the huge dielectric anisotropy. Our model provides important guidelines for future device design and material development. To further enhance transmittance and reduce voltage, we have proposed a Z-shaped electrode structure. By optimizing the device structure, we have successfully reduced the operating voltage to ~8V and enhanced… Advisors/Committee Members: Wu, Shin-Tson.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Xu, D. (2016). Advanced Blue Phase Liquid Crystal Displays. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4926

Chicago Manual of Style (16^th Edition):

Xu, Daming. “Advanced Blue Phase Liquid Crystal Displays.” 2016. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/4926.

MLA Handbook (7^th Edition):

Xu, Daming. “Advanced Blue Phase Liquid Crystal Displays.” 2016. Web. 26 Feb 2021.

Vancouver:

Xu D. Advanced Blue Phase Liquid Crystal Displays. [Internet] [Doctoral dissertation]. University of Central Florida; 2016. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/4926.

Council of Science Editors:

Xu D. Advanced Blue Phase Liquid Crystal Displays. [Doctoral Dissertation]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/4926

University of Central Florida

16. Ulhassan, Absar. Non-Hermitian Optics.

Degree: 2018, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6011

► From the viewpoint of quantum mechanics, a system must always be Hermitian since all its corresponding eigenvalues must be real. In contrast, the eigenvalues of… (more)

▼ From the viewpoint of quantum mechanics, a system must always be Hermitian since all its corresponding eigenvalues must be real. In contrast, the eigenvalues of open systems-unrestrained because of either decay or amplification-can be in general complex. Not so long ago, a certain class of non-Hermitian Hamiltonians was discovered that could have a completely real eigenvalue spectrum. This special class of Hamiltonians was found to respect the property of commutation with the parity-time (PT) operator. Translated into optics, this implies a balance between regions exhibiting gain and loss. Traditionally, loss has been perceived as a foe in optics and something that needs to be avoided at all costs. As we will show, when used in conjunction with gain, the presence of loss can lead to a host of counterintuitive outcomes in such non-Hermitian configurations that would have been otherwise unattainable in standard arrangements. We will study PT symmetric phase transitions in various optical settings that include semiconductor microrings and coupled fiber cavities, and show how they can allow mode-selectivity in lasers. One of the key outcomes of this effort was the realization of higher order degeneracies in a three-cavity laser configuration that can exhibit orders-of-magnitude larger sensitivity to external perturbations. We will also consider systems that display nonlinear effects such as gain saturation, thus allowing novel phase transitions. Some interesting properties associated with degeneracies in non-Hermitian settings will be investigated as well. Such degeneracies, called exceptional points (EPs), are much more drastic compared to standard degeneracies of eigenvalues because the corresponding eigenvectors also coalesce, which in turn reduces the dimensionality of the phase space. We will show that dynamic parameter contours enclosing or close to EPs can lead to a robust chiral mode conversion process – something that can be potentially used to realize omni-polarizing optical devices. Advisors/Committee Members: Christodoulides, Demetrios.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Ulhassan, A. (2018). Non-Hermitian Optics. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6011

Chicago Manual of Style (16^th Edition):

Ulhassan, Absar. “Non-Hermitian Optics.” 2018. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6011.

MLA Handbook (7^th Edition):

Ulhassan, Absar. “Non-Hermitian Optics.” 2018. Web. 26 Feb 2021.

Vancouver:

Ulhassan A. Non-Hermitian Optics. [Internet] [Doctoral dissertation]. University of Central Florida; 2018. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6011.

Council of Science Editors:

Ulhassan A. Non-Hermitian Optics. [Doctoral Dissertation]. University of Central Florida; 2018. Available from: https://stars.library.ucf.edu/etd/6011

University of Central Florida

17. Akhlaghi Bouzan, Milad. Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing.

Degree: 2017, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6090

► Properties of light such as amplitude and phase, temporal and spatial coherence, polarization, etc. are abundantly used for sensing and imaging. Regardless of the passive… (more)

▼ Properties of light such as amplitude and phase, temporal and spatial coherence, polarization, etc. are abundantly used for sensing and imaging. Regardless of the passive or active nature of the sensing method, optical intensity fluctuations are always present! While these fluctuations are usually regarded as noise, there are situations where one can harness the intensity fluctuations to enhance certain attributes of the sensing procedure. In this thesis, we developed different sensing methodologies that use statistical properties of optical fluctuations for gauging specific information. We examine this concept in the context of three different aspects of computational optical imaging and sensing. First, we study imposing specific statistical properties to the probing field to image or characterize certain properties of an object through a statistical analysis of the spatially integrated scattered intensity. This offers unique capabilities for imaging and sensing techniques operating in highly perturbed environments and low-light conditions. Next, we examine optical sensing in the presence of strong perturbations that preclude any controllable field modification. We demonstrate that inherent properties of diffused coherent fields and fluctuations of integrated intensity can be used to track objects hidden behind obscurants. Finally, we address situations where, due to coherent noise, image accuracy is severely degraded by intensity fluctuations. By taking advantage of the spatial coherence properties of optical fields, we show that this limitation can be effectively mitigated and that a significant improvement in the signal-to-noise ratio can be achieved even in one single-shot measurement. The findings included in this dissertation illustrate different circumstances where optical fluctuations can affect the efficacy of computational optical imaging and sensing. A broad range of applications, including biomedical imaging and remote sensing, could benefit from the new approaches to suppress, enhance, and exploit optical fluctuations, which are described in this dissertation. Advisors/Committee Members: Dogariu, Aristide.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Akhlaghi Bouzan, M. (2017). Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6090

Chicago Manual of Style (16^th Edition):

Akhlaghi Bouzan, Milad. “Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing.” 2017. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6090.

MLA Handbook (7^th Edition):

Akhlaghi Bouzan, Milad. “Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing.” 2017. Web. 26 Feb 2021.

Vancouver:

Akhlaghi Bouzan M. Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing. [Internet] [Doctoral dissertation]. University of Central Florida; 2017. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6090.

Council of Science Editors:

Akhlaghi Bouzan M. Harnessing Spatial Intensity Fluctuations for Optical Imaging and Sensing. [Doctoral Dissertation]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/6090

University of Central Florida

18. Wang, Yang. Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments.

Degree: 2017, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5760

► At present, the energy of a single isolated attosecond pulse is limited to nanojoule levels. As a result, an intense femtosecond pulse has always… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Wang, Y. (2017). Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5760

Chicago Manual of Style (16^th Edition):

Wang, Yang. “Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments.” 2017. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5760.

MLA Handbook (7^th Edition):

Wang, Yang. “Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments.” 2017. Web. 26 Feb 2021.

Vancouver:

Wang Y. Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments. [Internet] [Doctoral dissertation]. University of Central Florida; 2017. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5760.

Council of Science Editors:

Wang Y. Generation of High-Flux Attosecond Pulses and Towards Attosecond-Attosecond Pump-Probe Experiments. [Doctoral Dissertation]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/5760

University of Central Florida

19. Eftekhar, Mohammad Amin. Nonlinear Dynamics in Multimode Optical Fibers.

Degree: 2018, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6215

► Multimode optical fibers have recently reemerged as a viable platform for addressing a number of long-standing issues associated with information bandwidth requirements and power-handling capabilities.… (more)

▼ Multimode optical fibers have recently reemerged as a viable platform for addressing a number of long-standing issues associated with information bandwidth requirements and power-handling capabilities. The complex nature of heavily multimoded systems can be effectively exploited to observe altogether novel physical effects arising from spatiotemporal and intermodal linear and nonlinear processes. Here, we have studied nonlinear dynamics in multimode optical fibers (MMFs) in both the normal and anomalous dispersion regimes. In the anomalous dispersion regime, the nonlinearity leads to a formation of spatiotemporal 3-D solitons. Unlike in single-mode fibers, these solitons are not unique and their properties can be modified through the additional degrees of freedom offered by these multimoded settings. In addition, soliton related processes such as soliton fission and dispersive wave generation will be also drastically altered in such multimode systems. Our theoretical work unravels some of the complexities of the underlying dynamics and helps us better understand these effects. The nonlinear dynamics in such multimode systems can be accelerated through a judicious fiber design. A cancelation of Raman self-frequency shifts and Blue-shifting multimode solitons were observed in such settings as a result of an acceleration of intermodal oscillations. Spatiotemporal instabilities in parabolic-index multimode fibers will also be discussed. In the normal dispersion regime, this effect can be exploited to generate an ultrabroad and uniform supercontinuum that extends more than 2.5 octaves. To do so, the unstable spectral regions are pushed away from the pump, thus sweeping the entire spectrum. Multimode parabolic pulses were also predicted and observed in passive normally dispersive tapered MMFs. These setting can obviate the harsh bandwidth limitation present in single-mode system imposed by gain medium and be effectively used for realizing high power multimode fiber lasers. Finally, an instant and efficient second-harmonic generation was observed in the multimode optical fibers. Through a modification of initial conditions, the efficiency of this process could be enhanced to a record high of %6.5. Advisors/Committee Members: Christodoulides, Demetrios.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Eftekhar, M. A. (2018). Nonlinear Dynamics in Multimode Optical Fibers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6215

Chicago Manual of Style (16^th Edition):

Eftekhar, Mohammad Amin. “Nonlinear Dynamics in Multimode Optical Fibers.” 2018. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6215.

MLA Handbook (7^th Edition):

Eftekhar, Mohammad Amin. “Nonlinear Dynamics in Multimode Optical Fibers.” 2018. Web. 26 Feb 2021.

Vancouver:

Eftekhar MA. Nonlinear Dynamics in Multimode Optical Fibers. [Internet] [Doctoral dissertation]. University of Central Florida; 2018. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6215.

Council of Science Editors:

Eftekhar MA. Nonlinear Dynamics in Multimode Optical Fibers. [Doctoral Dissertation]. University of Central Florida; 2018. Available from: https://stars.library.ucf.edu/etd/6215

University of Central Florida

20. Hodaei, Hossein. Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points.

Degree: 2017, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5740

► In recent years, non-Hermitian degeneracies also known as exceptional points (EPs) have emerged as a new paradigm for engineering the response of optical systems.… (more)

▼ In recent years, non-Hermitian degeneracies also known as exceptional points (EPs) have emerged as a new paradigm for engineering the response of optical systems. EPs can appear in a wide class of open non-Hermitian configurations. Among different types of non-conservative photonic systems, parity-time (PT) symmetric arrangements are of particular interest since they provide an excellent platform to explore the physics of exceptional points. In this work, the intriguing properties of exceptional points are utilized to address two of the long standing challenges in the field of integrated photonics- enforcing single mode lasing in intrinsically multimode cavities and enhancing the sensitivity of micro-resonators. In the first part of this work, I will describe how stable single mode lasing can be readily achieved in longitudinally and transversely multi-moded microring cavities through the systematic utilization of abrupt phase transitions at exceptional points. This technique will be first demonstrated in a parity-time laser that is comprised of a gain cavity coupled to an identical but lossy counterpart. A detailed study of the behavior of this system around the exceptional point will be presented. Furthermore, we report the first experimental realization of a dark state laser in which by strategically designing the spectral locations of exceptional points, widely tunable single-mode lasing can be attained even at high pump levels. Despite the presence of loss in such open laser systems, the slope efficiency remains virtually intact. Our results demonstrate the potential of exceptional points as a versatile design tool for mode management in on-chip laser configurations. In the second part of my dissertation, I will show how the exceptional points and their underlying degeneracies can be used to significantly boost the intrinsic sensitivity of microcavities. I will demonstrate the enhanced sensitivity in a binary PT-symmetric coupled cavity arrangement that is biased at an exceptional point. Then I will report the first observation of higher-order exceptional points in a ternary parity-time symmetric microring laser system with a judiciously tailored gain-loss distribution. The enhanced response associated with this ternary system follows a cubic root dependence on externally introduced perturbation, which can in turn be detected in the spectral domain. Using such arrangements, more than one order of magnitude enhancement in the sensitivity is observed experimentally. These results can pave the way towards improving the performance of current on-chip micro-cavity sensors. Advisors/Committee Members: Khajavikhan, Mercedeh.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Hodaei, H. (2017). Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5740

Chicago Manual of Style (16^th Edition):

Hodaei, Hossein. “Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points.” 2017. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5740.

MLA Handbook (7^th Edition):

Hodaei, Hossein. “Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points.” 2017. Web. 26 Feb 2021.

Vancouver:

Hodaei H. Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points. [Internet] [Doctoral dissertation]. University of Central Florida; 2017. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5740.

Council of Science Editors:

Hodaei H. Novel Photonic Resonance Arrangements Using Non-Hermitian Exceptional Points. [Doctoral Dissertation]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/5740

University of Central Florida

21. Malinowski, Marcin. Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6526

► The field of integrated photonics aims at compressing large and environmentally-sensitive optical systems to micron-sized circuits that can be mass-produced through existing semiconductor fabrication facilities.… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Malinowski, M. (2019). Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6526

Chicago Manual of Style (16^th Edition):

Malinowski, Marcin. “Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6526.

MLA Handbook (7^th Edition):

Malinowski, Marcin. “Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications.” 2019. Web. 26 Feb 2021.

Vancouver:

Malinowski M. Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6526.

Council of Science Editors:

Malinowski M. Third-order Optical Nonlinearities for Integrated Microwave Photonics Applications. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6526

University of Central Florida

22. Ru, Qitian. Broadband Mid-infrared Frequency Combs Generated via Frequency Division.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6570

► Frequency combs have revolutionized metrology and demonstrated numerous applications in science and technology. Combs operating in the mid-infrared region could be beneficial for molecular spectroscopy… (more)

▼ Frequency combs have revolutionized metrology and demonstrated numerous applications in science and technology. Combs operating in the mid-infrared region could be beneficial for molecular spectroscopy for several reasons. First, numerous molecules have their spectroscopic signatures in this region. Furthermore, the atmospheric window (3-5μm and 8-14μm) is located here. Additionally, a mid-infrared frequency comb could be employed as a diagnostic tool for the many components of human breath, as well as for detection of harmful gases and contaminants in the atmosphere. In this thesis, I used synchronously pumped subharmonic optical parametric oscillators (OPOs) operating at degeneracy to produce ultra-broadband outputs near half of the pump laser frequency. One attractive property of the subharmonic OPOs is that the signal/idler waves of the OPO are frequency- and phase-locked to the pump frequency comb. We explored three new nonlinear materials in the subharmonic OPO and demonstrated a broadband spectrum for mid-infrared frequency comb generation. (1) Orientation-patterned (OP) gallium arsenide (GaAs) was selected as the first material because it has high nonlinearity. We found that the OP-GaAs based OPO yielded an approximately two-octave wide spectrum (2.8–11μm). (2) Gallium phosphide (GaP) has near zero group velocity dispersion (GVD) at 4.7 μm and a large bandgap. The OP-GaP OPO yielded a spectrum of more than two octaves (3–12.5μm). Also, because of the large bandgap, GaP is suitable for telecom 1.56-μm pumping, having the advantage of much smaller GVD than in periodically-poled-lithium-niobite (PPLN). The telecom laser (1.56μm) pumped OP-GaP OPO was demonstrated with more than one octave wide spectrum. (3) Finally, we explored the phenomenon of random phase matching in the zinc selenide (ZnSe) polycrystalline material. The first random phase matched OPO was demonstrated with more than one octave spectrum (3.1– 9μm), which is also the first OPO based on ZnSe. Advisors/Committee Members: Vodopyanov, Konstantin.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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

APA (6^th Edition):

Ru, Q. (2019). Broadband Mid-infrared Frequency Combs Generated via Frequency Division. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6570

Chicago Manual of Style (16^th Edition):

Ru, Qitian. “Broadband Mid-infrared Frequency Combs Generated via Frequency Division.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6570.

MLA Handbook (7^th Edition):

Ru, Qitian. “Broadband Mid-infrared Frequency Combs Generated via Frequency Division.” 2019. Web. 26 Feb 2021.

Vancouver:

Ru Q. Broadband Mid-infrared Frequency Combs Generated via Frequency Division. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6570.

Council of Science Editors:

Ru Q. Broadband Mid-infrared Frequency Combs Generated via Frequency Division. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6570

University of Central Florida

23. Talukder, Md Javed Rouf. High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6583

► See-through augmented reality and virtual reality displays are emerging due to their widespread applications in education, engineering design, medical, retail, transportation, automotive, aerospace, gaming, and… (more)

▼ See-through augmented reality and virtual reality displays are emerging due to their widespread applications in education, engineering design, medical, retail, transportation, automotive, aerospace, gaming, and entertainment. For augmented reality and virtual reality displays, high-resolution density, high luminance, fast response time and high ambient contrast ratio are critically needed. High-resolution density helps eliminate the screen-door effect, high luminance and fast response time enable low duty ratio operation, which plays a key role for suppressing image blurs. A dimmer placed in front of AR display helps to control the incident background light, which in turn improves the image contrast. In this dissertation, we have focused three crucial display metrics: high luminance, fast motion picture response time (MPRT) and high ambient contrast ratio. We report a fringe-field switching liquid crystal display, abbreviated as d-FFS LCD, by using a low viscosity material and new diamond-shape electrode configuration. Our proposed device shows high transmittance, fast motion picture response time, low operation voltage, wide viewing angle, and indistinguishable color shift and gamma shift. We also investigate the rubbing angle effects on transmittance and response time. When rubbing angle is 0 degree, the virtual wall effect is strong, resulting in fast response time but compromised transmittance. When rubbing angle is greater than 1.2 degree, the virtual walls disappear, as a result, the transmittance increases dramatically, but the tradeoff is in slower response time. We also demonstrate a photo-responsive guest-host liquid crystal (LC) dimmer to enhance the ambient contrast ratio in augmented reality displays. The LC composition consists of photo-stable chiral agent, photosensitive azobenzene, and dichroic dye in a nematic host with negative dielectric anisotropy. In this device, transmittance changes from bright state to dark state by exposing a low intensity UV or blue light. Reversal process can be carried out by red light or thermal effect. Such a polarizer-free photo-activated dimmer can also be used for wide range of applications, such as diffractive photonic devices, portable information system, vehicular head-up displays, and smart window for energy saving purpose. A dual-stimuli polarizer-free dye-doped liquid crystal (LC) device is demonstrated as a dimmer. Upon UV/blue light exposure, the LC directors and dye molecules turn from initially vertical alignment (high transmittance state) to twisted fingerprint structure (low transmittance state). The reversal process is accelerated by combining a longitudinal electric field to unwind the LC directors from twisted fingerprint to homeotropic state, and a red light to transform the cis azobenzene back to trans. Such an electric-field-assisted reversal time can be reduced from ~10s to a few milliseconds, depending on the applied voltage. Considering power consumption, low manufacturing cost, and large fabrication tolerance, this device can be used as a smart… Advisors/Committee Members: Wu, Shintson.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Talukder, M. J. R. (2019). High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6583

Chicago Manual of Style (16^th Edition):

Talukder, Md Javed Rouf. “High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6583.

MLA Handbook (7^th Edition):

Talukder, Md Javed Rouf. “High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality.” 2019. Web. 26 Feb 2021.

Vancouver:

Talukder MJR. High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6583.

Council of Science Editors:

Talukder MJR. High Performance Liquid Crystal Devices for Augmented Reality and Virtual Reality. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6583

University of Central Florida

24. Hayenga, William. Fundamental Properties of Metallic Nanolasers.

Degree: 2019, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6604

► The last two decades have witnessed tremendous advancements in the area of nanophotonics and plasmonics, which has helped propel the development of integrated photonic sources.… (more)

▼ The last two decades have witnessed tremendous advancements in the area of nanophotonics and plasmonics, which has helped propel the development of integrated photonic sources. Of central importance to such circuits is compact, scalable, low threshold, and efficient coherent sources that can be driven at high modulation frequencies. In this regard, metallic nanolasers offer a unique platform. Their introduction has enabled confinement of light at a subwavelength scale and the ultra-small size of the modes afforded by these structures allows for cavity enhancing effects that can help facilitate thresholdless lasing and large direct modulation bandwidths. In this report, I present my work on the study of the fundamental properties of metallic nanolasers. I start with a rate equation model to predict threshold behavior and the modulation response of metallic nanolasers. Next, I explain the second-order coherence measurement setup that was built, based on a modified Hanbury-Brown and Twiss experiment, to assess the intensity autocorrelation of various optically pumped metallic nanolasers. These studies concluded that metallic coaxial and disk-shaped nanolasers are capable of generating truly coherent radiation. Subsequently, design considerations are taken into account for electrically pumped coaxial nanolasers. This has led to the demonstration of electrically injected coaxial and disk-shaped nanolasers at cryogenic temperatures. Lastly, the appearance of collective behaviors in metallic nanolasers lattices is explored. Individually supporting modes that are highly vectorial by nature, when such cavities are fabricated in close proximity to one another, coupling through their overlapping fields results in the formation of a set of supermodes. The tendency of the system to minimize the overall loss leads to each element of the lattice having a geometric dependent field distribution and helps promotes single-mode lasing. We show both through simulations and experimentally that this effect can lead to the direct generation of vector vortices. Advisors/Committee Members: Khajavikhan, Mercedeh.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Hayenga, W. (2019). Fundamental Properties of Metallic Nanolasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6604

Chicago Manual of Style (16^th Edition):

Hayenga, William. “Fundamental Properties of Metallic Nanolasers.” 2019. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6604.

MLA Handbook (7^th Edition):

Hayenga, William. “Fundamental Properties of Metallic Nanolasers.” 2019. Web. 26 Feb 2021.

Vancouver:

Hayenga W. Fundamental Properties of Metallic Nanolasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2019. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6604.

Council of Science Editors:

Hayenga W. Fundamental Properties of Metallic Nanolasers. [Doctoral Dissertation]. University of Central Florida; 2019. Available from: https://stars.library.ucf.edu/etd/6604

University of Central Florida

25. Klee, Anthony. Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.

Degree: 2016, University of Central Florida

URL: https://stars.library.ucf.edu/etd/4925

► Mode-locked lasers have numerous applications in the areas of communications, spectroscopy, and frequency metrology. Harmonically mode-locked semiconductor lasers with external ring cavities offer a unique… (more)

▼ Mode-locked lasers have numerous applications in the areas of communications, spectroscopy, and frequency metrology. Harmonically mode-locked semiconductor lasers with external ring cavities offer a unique combination of benefits in that they can produce high repetition rate pulse trains with low timing jitter, achieve narrow axial mode linewidths, have the potential for entire monolithic integration on-chip, feature high wall-plug efficiency due to direct electrical pumping, and can be engineered to operate in different wavelength bands of interest. However, lasers based on InP/InGaAsP quantum well devices which operate in the important telecom C-band have thus far been relatively limited in bandwidth as compared to competing platforms. Broad bandwidth is critical for increasing information carrying capacity and enabling femtosecond pulse production for coherent continuum generation in offset frequency stabilization. The goal of the work in this dissertation is to maximize the bandwidth of semiconductor lasers, bringing them closer to reaching their full potential as all-purpose sources. Dispersion in the laser cavity is a primary limiter of the achievable bandwidth in the laser architectures covered in this dissertation. In the first part of this dissertation, an accurate self-referenced technique based on multi-heterodyne detection is developed for measuring the spectral phase of a mode-locked laser. This technique is used to characterize the dispersion in several semiconductor laser architectures. In the second part, this knowledge is applied to reduce the dispersion in a laser cavity using a programmable pulse shaper, and thus increase the laser's spectral bandwidth. We demonstrate a 10 GHz frequency comb with bandwidth spanning 5 THz, representing a twofold improvement over the previously achievable bandwidth. Finally, this laser is converted to a stand-alone system by reconfiguring it as a coupled opto-electronic oscillator and a novel stabilization scheme is presented. Advisors/Committee Members: Delfyett, Peter.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Klee, A. (2016). Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/4925

Chicago Manual of Style (16^th Edition):

Klee, Anthony. “Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.” 2016. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/4925.

MLA Handbook (7^th Edition):

Klee, Anthony. “Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers.” 2016. Web. 26 Feb 2021.

Vancouver:

Klee A. Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2016. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/4925.

Council of Science Editors:

Klee A. Broad Bandwidth Optical Frequency Combs from Low Noise, High Repetition Rate Semiconductor Mode-Locked Lasers. [Doctoral Dissertation]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/4925

University of Central Florida

26. Mehta, Naman Anilkumar. Multi-Purpose device for analyzing and measuring ultra-short pulses.

Degree: 2016, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5135

► Intensity auto correlator is device to measure pulse widths of ultrashort pulses on the order of picoseconds and femtoseconds. I have built an in-house, compact,… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Mehta, N. A. (2016). Multi-Purpose device for analyzing and measuring ultra-short pulses. (Masters Thesis). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5135

Chicago Manual of Style (16^th Edition):

Mehta, Naman Anilkumar. “Multi-Purpose device for analyzing and measuring ultra-short pulses.” 2016. Masters Thesis, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5135.

MLA Handbook (7^th Edition):

Mehta, Naman Anilkumar. “Multi-Purpose device for analyzing and measuring ultra-short pulses.” 2016. Web. 26 Feb 2021.

Vancouver:

Mehta NA. Multi-Purpose device for analyzing and measuring ultra-short pulses. [Internet] [Masters thesis]. University of Central Florida; 2016. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5135.

Council of Science Editors:

Mehta NA. Multi-Purpose device for analyzing and measuring ultra-short pulses. [Masters Thesis]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/5135

University of Central Florida

27. Suttinger, Matthew. Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance.

Degree: 2017, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6088

► Quantum Cascade Lasers are a novel source of coherent infrared light, unique in their tunability over the mid-infrared and terahertz range of frequencies. Advances in… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Suttinger, M. (2017). Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance. (Masters Thesis). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6088

Chicago Manual of Style (16^th Edition):

Suttinger, Matthew. “Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance.” 2017. Masters Thesis, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6088.

MLA Handbook (7^th Edition):

Suttinger, Matthew. “Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance.” 2017. Web. 26 Feb 2021.

Vancouver:

Suttinger M. Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance. [Internet] [Masters thesis]. University of Central Florida; 2017. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6088.

Council of Science Editors:

Suttinger M. Thermal and Waveguide Optimization of Broad Area Quantum Cascade Laser Performance. [Masters Thesis]. University of Central Florida; 2017. Available from: https://stars.library.ucf.edu/etd/6088

University of Central Florida

28. Vazquez-Guardado, Abraham. Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions.

Degree: 2018, University of Central Florida

URL: https://stars.library.ucf.edu/etd/6262

► Light-matter interaction is a pivotal effect that involves the synergetic interplay of electromag- netic fields with fundamental particles. In this regard localized surface plasmons (LSP)… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Vazquez-Guardado, A. (2018). Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/6262

Chicago Manual of Style (16^th Edition):

Vazquez-Guardado, Abraham. “Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions.” 2018. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/6262.

MLA Handbook (7^th Edition):

Vazquez-Guardado, Abraham. “Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions.” 2018. Web. 26 Feb 2021.

Vancouver:

Vazquez-Guardado A. Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions. [Internet] [Doctoral dissertation]. University of Central Florida; 2018. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/6262.

Council of Science Editors:

Vazquez-Guardado A. Cavity-Coupled Plasmonic Systems for Enhanced Light-Matter Interactions. [Doctoral Dissertation]. University of Central Florida; 2018. Available from: https://stars.library.ucf.edu/etd/6262

University of Central Florida

29. Yang, Xu. Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers.

Degree: 2016, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5205

► Nowadays, Vertical-Cavity Surface-Emitting Lasers (VCSELs) are the most popular optical sources in short-reach data communications. In the commercial oxide VCSEL technology, an oxide aperture is… (more)

▼ Nowadays, Vertical-Cavity Surface-Emitting Lasers (VCSELs) are the most popular optical sources in short-reach data communications. In the commercial oxide VCSEL technology, an oxide aperture is created inside resonant cavity in realizing good mode and current confinement, however, high electrical resistance comes along with forming the oxide aperture and the electrical parasitic bandwidth becomes the main limitation in modulation speed. In this report, electrical bandwidths of oxide-free lithographic VCSELs have been studied along with their general lasing properties. Due to the new ways of fabricating the aperture, record low resistances have been achieved in oxide-free lithographic VCSELs with various sizes, while high slope efficiencies and high output powers have been maintained. High speed simulation has been performed showing the very low differential resistances will benefit much to the electrical parasitic bandwidths, and are expected to produce higher modulation speed. A bottom emitting structure has been proposed and analyzed, showing reduction in both mirror resistance and capacitance will further improve the modulation speed. The total 3-dB modulation bandwidth is expected to be 50-80 GHz, much higher than the bandwidth reached in existing oxide VCSELs. Lithographic VCSELs also show superior lasing characteristics, including record low thermal resistance and record high output power. The maximum power exceeds 19 mW in a 6 µm device and over 50 % power conversion efficiency has been achieved. A maximum single mode operation power of 5 mW has been observed from a 1 µm diameter VCSEL. High temperature stress testing has been performed showing lithographic VCSELs can operate more reliably than oxide VCSELs under extreme operating conditions. Lithographic VCSEL with low electrical resistance, single-mode operation, high efficiency, and high power will be a strong candidate as the optical source in high speed data communications, as well as other applications such as high power VCSEL arrays and optical sensing. Advisors/Committee Members: Deppe, Dennis.

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Yang, X. (2016). Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5205

Chicago Manual of Style (16^th Edition):

Yang, Xu. “Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers.” 2016. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5205.

MLA Handbook (7^th Edition):

Yang, Xu. “Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers.” 2016. Web. 26 Feb 2021.

Vancouver:

Yang X. Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2016. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5205.

Council of Science Editors:

Yang X. Electrical Parasitic Bandwidth Limitations of Oxide-Free Lithographic Vertical-Cavity Surface-Emitting Lasers. [Doctoral Dissertation]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/5205

University of Central Florida

30. Li, Mingxin. Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers.

Degree: 2016, University of Central Florida

URL: https://stars.library.ucf.edu/etd/5204

► Vertical-cavity surface-emitting lasers (VCSELs) have been greatly improved and successfully commercialized over the past few decades owing to their ability to provide both mode and… (more)

Subjects/Keywords: Electromagnetics and Photonics; Optics

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APA (6^th Edition):

Li, M. (2016). Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/5204

Chicago Manual of Style (16^th Edition):

Li, Mingxin. “Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers.” 2016. Doctoral Dissertation, University of Central Florida. Accessed February 26, 2021. https://stars.library.ucf.edu/etd/5204.

MLA Handbook (7^th Edition):

Li, Mingxin. “Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers.” 2016. Web. 26 Feb 2021.

Vancouver:

Li M. Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers. [Internet] [Doctoral dissertation]. University of Central Florida; 2016. [cited 2021 Feb 26]. Available from: https://stars.library.ucf.edu/etd/5204.

Council of Science Editors:

Li M. Intrinsic Modulation Response Modeling and Analysis for Lithographic Vertical-Cavity Surface-Emitting Lasers. [Doctoral Dissertation]. University of Central Florida; 2016. Available from: https://stars.library.ucf.edu/etd/5204

Open Access Theses and Dissertations