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Proceedings Paper

Optimization of semi-insulating surface-plasmon waveguides within terahertz QCL's using computational models
Author(s): Christopher Baird; Bryan Crompton; Philip Slingerland; Robert Giles; William E. Nixon
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Paper Abstract

The possibility of a compact source of coherent terahertz radiation is being realized through the development of quantum cascade lasers (QCL's). These lasers consist of a semiconducting heterostructure active region and an internal waveguide that make intraband lasing transitions possible. The use of terahertz QCL's in promising applications such as medical imaging, defense, and security is currently limited by low output laser power. Systematic optimization of the QCL's waveguide reduces mode losses, improves confinement, and increases output power. Waveguide optimization is especially important for lasers operating at low terahertz frequencies where semi-insulating surface-plasmon waveguide performance degrades significantly. Prediction codes have been developed that systematically optimize semi-insulating surface-plasmon waveguides. The methods and results of these optimizations will be presented for a full suite of terahertz QCL waveguides at different frequencies. The use of the optimization code to investigate graded-doping waveguide structures will also be presented.

Paper Details

Date Published: 26 April 2010
PDF: 10 pages
Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 767109 (26 April 2010); doi: 10.1117/12.855819
Show Author Affiliations
Christopher Baird, Univ. of Massachusetts Lowell (United States)
Bryan Crompton, Univ. of Massachusetts Lowell (United States)
Philip Slingerland, Univ. of Massachusetts Lowell (United States)
Robert Giles, Univ. of Massachusetts Lowell (United States)
William E. Nixon, U.S. Army National Ground Intelligence Ctr. (United States)

Published in SPIE Proceedings Vol. 7671:
Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense
Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe, Editor(s)

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