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Proceedings Paper

Far infrared and terahertz quantum well intra-subband photodetector (QWISP)
Author(s): David Z.-Y. Ting; Yia-Chung Chang; Sumith V. Bandara; Sarath D. Gunapala
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Paper Abstract

We describe a new device concept for far infrared (FIR) / terahertz (THz) radiation detection based on the use of dopant-assisted intra-subband absorption mechanism in quantum wells. We compare the Quantum Well Intra-Subband Photodetector (QWISP) to the FIR/THz quantum-well infrared photodetector (QWIP) and heterojunction internal photoemission (HIP) devices to clarify the device concept. We demonstrate QWISP's effectiveness through theoretical simulations by comparing it with the FIR/THz QWIP with comparable dark current levels and peak spectral positions. In particular, our modeling results show that in a device designed for ~110 μm peak response, the QWISP peak absorption coefficient and responsivity, respectively, are approximately 100 and 10 times strong than those for the FIR/THz QWIP. The QWISP is a compact device with normal incidence response, does not require very low barriers, and is compatible with existing GaAs focal-plane array technology.

Paper Details

Date Published: 26 September 2007
PDF: 12 pages
Proc. SPIE 6660, Infrared Systems and Photoelectronic Technology II, 66600F (26 September 2007); doi: 10.1117/12.735138
Show Author Affiliations
David Z.-Y. Ting, Jet Propulsion Lab. (United States)
Yia-Chung Chang, Univ. of Illinois at Urbana-Champaign (United States)
Sumith V. Bandara, Jet Propulsion Lab. (United States)
Sarath D. Gunapala, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 6660:
Infrared Systems and Photoelectronic Technology II
Eustace L. Dereniak; Randolph E. Longshore; John P. Hartke; Ashok K. Sood, Editor(s)

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