Infrared and Laser Engineering, Volume. 49, Issue 1, 103008(2020)
GaAs/AlGaAs QWIP IRFPA for 10.55 μm long wavelength
640×512 Quantum Well Infrared Photo-detector(QWIP) long wavelength infrared(LWIR) focal plane arrays(FPA) were made by using GaAs/AlGaAs quantum well structure. The response spectra were at 10.55 μm. Integrated with rotation sterling cooler which gave a temperature of 50 K, the FPA was measured to find the results that NETD was about 22.5 mK. The FPA assembly kept good performance after the switch-on-off cycling test and thermal vacuum test. The illumination non-uniformity of the focal plane with a cold shield was calculated with a numerical method. The results were compared with the approximate analytic method. It is shown that numerical method should be used for small F-numbers. Thus, the measured non-uniformity is believed to be dominated by the illumination non-uniformity. By using the MEEP FDTD software, calculation about the near-field photo-coupled electrical-field energy were designed and results show that current QWIP structure parameters are near optimized in term of optical diffraction.
Get Citation
Copy Citation Text
Li Xiangyang, Li Ning, Xu Jintong, Chu Kaihui, Xu Guoqing, Wang Ling, Zhang Yan, Zhu Longyuan, Wang Jiqiang, Lu Wei. GaAs/AlGaAs QWIP IRFPA for 10.55 μm long wavelength[J]. Infrared and Laser Engineering, 2020, 49(1): 103008
Category: 特约专栏———新型红外器件
Received: Oct. 5, 2019
Accepted: Nov. 15, 2019
Published Online: Jun. 8, 2020
The Author Email: Xiangyang Li (lixy@mail.sitp.ac.cn)