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

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  • Z. XIE
  • J. HUANG
  • X. CHAI
  • Z. DENG
  • Y. CHEN
  • Q. LU
  • Z. XU
  • J. CHEN
  • Y. ZHOU
  • B. CHEN
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<mark>Journal publication date</mark>20/11/2020
<mark>Journal</mark>Optics Express
Issue number24
Volume28
Number of pages9
Pages (from-to)36915-36923
Publication StatusPublished
<mark>Original language</mark>English

Abstract

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 μm and a 3-dB bandwidth up to 7.04 GHz. The relatively low dark current density around 9.39 × 10-2 A/cm2 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.