8 September 2011 Strain-compensated InP-based InGaAsInAlAs quantum cascade infrared detectors for 3-5μm atmospheric window
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Abstract
Infrared detection within the atmospheric window between 3 to 5μm has gained great interest because of its wide range of applications, such as eye-safe free-space optical communication links and high-precision time-of-flight measurements used in 3D imaging. In this letter, we report on the characteristics of two InP-based strain-compensated InGaAs/InAlAs quantum cascade detectors (QCDs) detecting around 4 μm and 4.5 μm, which are promising candidates for applications in this wavelength range. Maximal responsivity values of 11.43mA/W at 180K and 10.1 mA/W at 78K and Johnson noise limited detectivities of 2.43×1010 and 2×1010 Jones at 78K, for the 4.5 μm and the 4 μm device, respectively, were obtained. In addition, both devices can work up to room temperature with responsivities of 0.81 mA/W(4.5μm) and 1.64 mA/W(4μm).
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Shen-qiang Zhai, Shen-qiang Zhai, Jun-qi Liu, Jun-qi Liu, Ning Kong, Ning Kong, Feng-qi Liu, Feng-qi Liu, Lu Li, Lu Li, Li-jun Wang, Li-jun Wang, Zhan-guo Wang, Zhan-guo Wang, } "Strain-compensated InP-based InGaAsInAlAs quantum cascade infrared detectors for 3-5μm atmospheric window", Proc. SPIE 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, 81931X (8 September 2011); doi: 10.1117/12.900225; https://doi.org/10.1117/12.900225
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