Suppressing spectral crosstalk in dual-band long- wavelength infrared photodetectors with monolithically integrated air-gapped distributed bragg reflectors

Yiyun Zhang, Abbas Haddadi, Arash Dehzangi, Romain Chevallier, Manijeh Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Antimonide-based type-II superlattices (T2SLs) have made possible the development of high-performance infrared cameras for use in a wide variety of thermal imaging applications, many of which could benefit from dual-band imaging. The performance of this material system has not reached its limits. One of the key issues in dual-band infrared photodetection is spectral crosstalk. In this paper, air-gapped distributed Bragg reflectors (DBRs) have been monolithically integrated between the two channels in long-/very long-wavelength dual-band InAs/InAs1-xSbx/AlAs1-xSbx-based T2SLs photodetectors to suppress the spectral crosstalk. This air-gapped DBR has achieved a significant spectral suppression in the 4.5-7.5 μ m photonic stopband while transmitting the optical wavelengths beyond 7.5 μ m, which is confirmed by theoretical calculations, numerical simulation, and experimental results.

Original languageEnglish (US)
Article number8543222
JournalIEEE Journal of Quantum Electronics
Volume55
Issue number1
DOIs
StatePublished - Feb 2019

Keywords

  • Antimonide-based type-II superlattices
  • dual-band infrared photodetectors
  • monolithically-integrated air-gapped DBRs
  • spectral cross-talk suppression

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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