30 August 2017 A GaAs-based up-converter for mid-infrared detection utilizing quantum cascade transport
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Abstract
The next generation infrared (IR) detection technology demands for very-large-format focal plane arrays (FPAs) with high performance. Semiconductor up-converters can convert IR photons to near-infrared (NIR) photons, and can be potential candidates for large-format IR imaging since the mechanical bonding with the read-out circuits can be avoided. However, previously reported up-converters and corresponding up-conversion systems suffer from low detectivity because of the trade-off between responsivity and dark current. To solve this issue, a cascade infrared up-converter (CIUP) is demonstrated in this work. Based on a quantum cascade transport mechanism, high IR responsivity is achieved while the dark current is maintained fairly low. A 4-μm InGaAs/AlGaAs CIUP has been fabricated, and both the CIUP and up-conversion system are under background-limited infrared performance (BLIP) regime below 120 K. The upconversion efficiency is 2.1 mW/W at 3.3 V and 78 K. Taking shot noise as the main noise in the up-conversion system, the BLIP detectivity of the system is 2.4×109 Jones at 3.3 V and 78 K, higher than the semiconductor up-converters at similar wavelengths reported so far. To further improve the CIUP performance, an AlInP hole-blocking layer is introduced taking place of the AlAs layer. AlInP/GaAs has larger valence band discontinuity than AlAs/GaAs, showing the advantage of tightly confining injected holes into the emission quantum well. By adopting the AlInP hole-blocking layer, the quantum efficiency and detectivity of the up-conversion system can be enhanced.
Conference Presentation
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Zhibiao Hao, Zhibiao Hao, Lili Xie, Lili Xie, Chao Wang, Chao Wang, Yaqi Liu, Yaqi Liu, Lai Wang, Lai Wang, Jian Wang, Jian Wang, Bing Xiong, Bing Xiong, Changzheng Sun, Changzheng Sun, Yanjun Han, Yanjun Han, Hongtao Li, Hongtao Li, Yi Luo, Yi Luo, } "A GaAs-based up-converter for mid-infrared detection utilizing quantum cascade transport", Proc. SPIE 10403, Infrared Remote Sensing and Instrumentation XXV, 1040309 (30 August 2017); doi: 10.1117/12.2273105; https://doi.org/10.1117/12.2273105
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