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Permanent link (DOI): https://doi.org/10.7939/R3SN01G45

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Terahertz Amplification and Modulation Devices on Gallium Nitride Open Access

Descriptions

Other title
Subject/Keyword
THz amplification
Negative differential resistance
Gallium nitride
THz modulation
THz source
Gunn Effect
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Carnio, Brett N.
Supervisor and department
Elezzabi, Abdulhakem (Electrical Engineering)
Barlage, Douglas (Electrical Engineering)
Examining committee member and department
Cadien, Ken (Chemical and Materials Engineering)
Jacob, Zubin (Electrical Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Electromagnetics and Microwaves
Date accepted
2015-06-01T14:27:36Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
This thesis focuses on developing a high power, compact source of Terahertz (THz) radiation. An amplifier and an oscillator are designed using an active device exhibiting the Gunn Effect. The amplification properties of the amplifier and oscillator are first studied using the commercial software Comsol Multiphysics. Then, the electrical properties of the active device are studied using the commercial software Crosslight APSYS. This thesis also focuses on the modulation of THz radiation by a 2 dimensional electron gas (2DEG). THz time-domain spectroscopy (THz-TDS) experiments are performed on gallium nitride (GaN) samples in the presence and absence of a 2DEG and the measurements are used to predict the modulation introduced by the 2DEG. Additionally, THz-TDS experiments are performed on a bare sapphire wafer and GaN thin films (having various doping densities) grown on a sapphire substrate. The refractive index of the sapphire and GaN is determined from the measurements and compared to literature values. Furthermore, the GaN relative permittivity is determined from the measurements and compared to the Drude model.
Language
English
DOI
doi:10.7939/R3SN01G45
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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