{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/81147"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/81147","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers","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. 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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.","Made available in DSpace on 2015-09-25T20:09:45Z (GMT). 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