Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers
Petschke, Adam Christopher
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https://hdl.handle.net/2142/81147
Description
Title
Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers
Author(s)
Petschke, Adam Christopher
Issue Date
2009
Doctoral Committee Chair(s)
Chuang, Shun-Lien
Department of Study
Electrical and Computer Engineering
Discipline
Electrical and Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
We also perform an experimental study of the role of the substrate on the optical and electrical properties. We find that the effect of the substrate thickness on the laser performance is dependent on other waveguide parameters. In particular, if the plasma layer is thick enough, the role of the substrate should be minimal. We use two-dimensional finite element modeling (FEM) to determine the threshold material gain coefficient and compare it to the experimental results of the threshold current density. We find that the threshold current density is roughly constant until the substrate thickness becomes smaller than 150 microm.
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