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Proceedings Paper

Optical coupling mechanisms in quantum well infrared photodetectors
Author(s): Sumith V. Bandara; Sarath D. Gunapala; John K. Liu; Winn Hong; Jin Suk Park
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Paper Abstract

Light coupling systems, such as gratings are required because quantum well infrared photodetectors do not respond to normal incident light due to the quantum mechanical selection rules associated with intersubband transitions. The resolution of the photolithography and accuracy of the etching become key issues in producing smaller grating features sizes especially in shorter wavelengths. An enhancement factor of three due to 2D periodic grating fabricated on a QWIP structure was observed. Variation of the enhancement factor with groove depth and feature size of the grating can be theoretically explained.

Paper Details

Date Published: 15 April 1997
PDF: 6 pages
Proc. SPIE 2999, Photodetectors: Materials and Devices II, (15 April 1997); doi: 10.1117/12.271180
Show Author Affiliations
Sumith V. Bandara, Jet Propulsion Lab. (United States)
Sarath D. Gunapala, Jet Propulsion Lab. (United States)
John K. Liu, Jet Propulsion Lab. (United States)
Winn Hong, Jet Propulsion Lab. (United States)
Jin Suk Park, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 2999:
Photodetectors: Materials and Devices II
Gail J. Brown; Manijeh Razeghi, Editor(s)

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