Recent Advances in InAs/GaSb Superlattices for Very Long Wavelength Infrared Detection

G. J. Brown*, F. Szmulowicz, K. Mahalingam, S. Houston, Y. Wei, A. Gin, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations


New infrared (IR) detector materials with high sensitivity, multi-spectral capability, improved uniformity and lower manufacturing costs are required for numerous long and very long wavelength infrared imaging applications. One materials system has shown great theoretical and, more recently, experimental promise for these applications: InAs/InxGa1-xSb type-II superlattices. In the past few years, excellent results have been obtained on photoconductive and photodiode samples designed for infrared detection beyond 15 microns. The infrared properties of various compositions and designs of these type-II superlattices have been studied. The infrared photoresponse spectra are combined with quantum mechanical modeling of predicted absorption spectra to provide insight into the underlying physics behind the quantum sensing in these materials. Results for superlattice photodiodes with cut-off wavelengths as long as 25 microns will be presented.

Original languageEnglish (US)
Pages (from-to)457-466
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2003
EventQuantum Sensing: Evolution and Revolution from Past to Future - San Jose, CA, United States
Duration: Jan 27 2003Jan 30 2003


  • Detector
  • Infrared
  • Photodiodes
  • Superlattice

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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