Mid-infrared gas detection using optically immersed, room-temperature, semiconductor devices

J. G. Crowder, H. R. Hardaway, C. T. Elliott

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We report the application of optically immersed, room-temperature InSb/InAlSb LED and photodiode devices to the ppm-level detection of nitrogen dioxide (NO2) at a wavelength of 6 µm. The LED emission and the photodiode detectivity are both increased by the optical immersion, resulting in a power dissipation of only 0.25 mW in the LED. A White cell is used for high gas sensitivity and its relatively small numerical aperture can be conveniently matched to the field of view of the hyperspherically immersed devices.

Original languageEnglish
Pages (from-to)882-884
Number of pages3
JournalMeasurement Science and Technology
Issue number6
Publication statusPublished - 2002


  • Gas detection
  • Gas sensing
  • InSb/InAlSb
  • Mid-infrared
  • Nitrogen dioxide
  • Optical immersion
  • Room-temperature LED
  • Room-temperature photodiode


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