Electromagnetic modeling of QWIP FPA pixels

K. K. Choi; M. D. Jhabvala; D. P. Forrai; A. Waczynski; J. Sun; R. Jones

doi:10.1117/12.883456

20 May 2011 Electromagnetic modeling of QWIP FPA pixels

K. K. Choi, M. D. Jhabvala, D. P. Forrai, A. Waczynski, J. Sun, R. Jones

Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 80120R (2011) https://doi.org/10.1117/12.883456
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Rigorous electromagnetic (EM) field modeling is applied to calculate the external quantum efficiency (QE) of various quantum well infrared photodetector (QWIP) pixel geometries with thinned substrates. We found that for a 24 × 24 × 1.5 μm³ cross-grating QWIP, the QE is peaked at 13.0, 11.0, and 8.4 μm, insensitive to the grating periods. These peaks are identified as the first three harmonic resonances associated with the pixel resonant cavity. For a regular prismshaped corrugated QWIP (C-QWIPs) with a 25-μm pitch, the QE oscillates about its classical value of 24.5% within the calculated wavelength range from 3 to 15 μm. A peaked value of 32% occurs at 9.1 μm. For pyramidal C-QWIPs, the maximum QE is 42%, and for cone-shaped C-QWIPs, it is 35%. In the presence of an anti-reflection coating, the oscillation amplitude diminishes, and the average values generally rise to near the peaks of the oscillations. The modeling results are compared with the experimental data for grating QWIP focal plane arrays (FPAs) and prismshaped C-QWIP FPAs; satisfactory agreements were achieved for both. After verifying our EM approach, we explored other detector geometries and found new types of resonator QWIPs (R-QWIPs) that can provide 30% QE at certain wavelengths on a 1.5-μm-thick active material. Combining the high QE of a resonator and the high gain of a thin material layer, the new R-QWIPs will have a conversion efficiency far higher than the existing QWIP detectors. The present resonator approach will also have an impact on other detector technologies.

Citation Download Citation

K. K. Choi, M. D. Jhabvala, D. P. Forrai, A. Waczynski, J. Sun, and R. Jones "Electromagnetic modeling of QWIP FPA pixels", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 80120R (20 May 2011); https://doi.org/10.1117/12.883456

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