High-speed mid-wave infrared interband cascade photodetector at room temperature

High-speed mid-wave infrared (MWIR) photodetectors have important applications in the emerging areas such high-precision frequency comb spectroscopy and light detection and ranging (LIDAR). In this work, we report a high-speed room-temperature mid-wave infrared interband cascade photodetector based on a type-II InAs/GaSb superlattice. The devices show an optical cut-off wavelength around 5 mu m and a 3-dB bandwidth up to 7.04 GHz. The relatively low dark current density around 9.39 x 10(-2) A/cm(2) under -0.1 V is also demonstrated at 300 K. These results validate the advantages of ICIPs to achieve both high-frequency operation and low noise at room temperature. Limitations on the high-speed performance of the detector are also discussed based on the S-parameter analysis and other RF performance measurement. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement