Wide spectral response of two-dimensional grating for quantum well infrared detector and wideband bound/quasi-bound QWIPs

Dongfeng Pan; Jinmin Li; YiPing Zeng; Mei-Ying Kong

doi:10.1117/12.255159

22 October 1996 Wide spectral response of two-dimensional grating for quantum well infrared detector and wideband bound/quasi-bound QWIPs

Dongfeng Pan, Jinmin Li, YiPing Zeng, Mei-Ying Kong

Author Affiliations +

Proceedings Volume 2816, Infrared Detectors for Remote Sensing: Physics, Materials, and Devices; (1996) https://doi.org/10.1117/12.255159
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

By defining a grating coupling efficiency for quantum well infrared photodetectors (QWIPs) and including all possible high order diffracted waves, the authors calculate the spectral response of grating for QWIPs on the basis of modal expansion method (MEM). Numerical simulations show that the two dimensional grating can cover very wide spectral range, including 3 - 5 micrometer and 8 - 12 micrometer. The influence of the depth of grating and cavity width on the spectral response has been shown. A method of improving the response bandwidth of grating coupled QWIPs has been realized. A wideband bound-quasibound type QWIP has been fabricated. The measured detectivity (80 K) at the wavelength of 6.6 micrometer, 7.8 micrometer, 9.0 micrometer and 9.5 micrometer are 2.6 multiplied by 10⁹, 2.1 multiplied by 10⁹,4.8 multiplied by 10⁹ and 4.4 multiplied by 10⁹ cmHz^1/2/W, respectively. The experiment has a good agreement with the theoretical results.

Citation Download Citation

Dongfeng Pan, Jinmin Li, YiPing Zeng, and Mei-Ying Kong "Wide spectral response of two-dimensional grating for quantum well infrared detector and wideband bound/quasi-bound QWIPs", Proc. SPIE 2816, Infrared Detectors for Remote Sensing: Physics, Materials, and Devices, (22 October 1996); https://doi.org/10.1117/12.255159

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