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Proceedings Paper

Investigation of plasmonic resonances in the two-dimensional electron gas of an InGaAs/InP high electron mobility transistor
Author(s): Justin W. Cleary; Robert E. Peale; Himanshu Saxena; Walter R. Buchwald
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Paper Abstract

The observation of THz regime transmission resonances in an InGaAs/InP high electron mobility transistor (HEMT) can be attributed to excitation of plasmons in its two-dimensional electron gas (2DEG). Properties of grating-based, gate-voltage tunable resonances are shown to be adequately modeled using commercial finite element method (FEM) software when the HEMT layer structure, gate geometry and sheet charge concentration are taken into account. The FEM results are shown to produce results consistent with standard analytical theories in the 10-100 cm-1 wavenumber range. An original analytic formula presented here describes how the plasmonic resonance may change in the presence of a virtual gate, or region of relatively high free charge carriers that lies in the HEMT between the physical grating gate and the 2DEG. The virtual gate and corresponding analytic formulation are able to account for the red-shifting experimentally observed in plasmonic resonances. The calculation methods demonstrated here have the potential to greatly aid in the design of future detection devices that require specifically tuned plasmonic modes in the 2DEG of a HEMT, as well as giving new insights to aid in the development of more complete analytic theories.

Paper Details

Date Published: 25 May 2011
PDF: 9 pages
Proc. SPIE 8023, Terahertz Physics, Devices, and Systems V: Advance Applications in Industry and Defense, 80230X (25 May 2011); doi: 10.1117/12.883480
Show Author Affiliations
Justin W. Cleary, Solid State Scientific Corp. (United States)
Robert E. Peale, Univ. of Central Florida (United States)
Himanshu Saxena, Zyberwear, Inc. (United States)
Walter R. Buchwald, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8023:
Terahertz Physics, Devices, and Systems V: Advance Applications in Industry and Defense
Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe, Editor(s)

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