C-QWIP focal plane array sensitivity

K. K. Choi; D. P. Forrai; D. Endres; J. Sun; P. Pinsukanjana; J. W. Devitt

doi:10.1117/12.816617

6 May 2009 C-QWIP focal plane array sensitivity

K. K. Choi, D. P. Forrai, D. Endres, J. Sun, P. Pinsukanjana, J. W. Devitt

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 729807 (2009) https://doi.org/10.1117/12.816617
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

We are developing corrugated quantum well infrared photodetector (C-QWIP) technology for long wavelength applications. A number of large format 1024 × 1024 C-QWIP focal plane arrays (FPAs) have been demonstrated. The measured quantum efficiency η is ranging from 15 - 37%, depending on the detector type, doping density and number of quantum wells in the detector material. The photoconductive gain is between 0.07 and 0.19, while the spectral width is between 1.5 and 3.5 microns. Despite the large integrated η of the C-QWIPs, the number of collected photoelectrons can be limited in shorter cutoff, small pixel FPAs under high speed operation. In this case, the read noise will have a large impact on the system sensitivity. In this paper, we will discuss the detector model, the measured pixel characteristics, and the effects of read noise on the FPA performance. Our analysis shows that the tolerable read noise improves with the cutoff wavelength. For example, to achieve a sensitivity of 20 mK at 2 msec integration time, the respective read noise will be 1000, 2000, 3000, and 4000 e¯ at λ_c = 8.8, 9.4, 10.7 and 11.7 μm. This analysis will help to determine the read noise requirement for the C-QWIP FPAs.

Citation Download Citation

K. K. Choi, D. P. Forrai, D. Endres, J. Sun, P. Pinsukanjana, and J. W. Devitt "C-QWIP focal plane array sensitivity", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 729807 (6 May 2009); https://doi.org/10.1117/12.816617

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KEYWORDS

Sensors

Staring arrays

Quantum wells

Quantum efficiency

Doping

Readout integrated circuits

Electrons

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