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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 9 — Mar. 20, 2010
  • pp: 1563–1573

Laser optical gas sensor by photoexcitation effect on refractive index

Geunsik Lim, Upul P. DeSilva, Nathaniel R. Quick, and Aravinda Kar  »View Author Affiliations


Applied Optics, Vol. 49, Issue 9, pp. 1563-1573 (2010)
http://dx.doi.org/10.1364/AO.49.001563


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Abstract

Laser optical gas sensors are fabricated by using the crystalline silicon carbide polytype 6 H - Si C , which is a wide-bandgap semiconductor, and tested at high temperatures up to 650 ° C . The sensor operates on the principle of semiconductor optics involving both the semiconductor and optical properties of the material. It is fabricated by doping 6 H - Si C with an appropriate dopant such that the dopant energy level matches the quantum of energy of the characteristic radiation emitted by the combustion gas of interest. This radiation changes the electron density in the semiconductor by photoexcitation and, thereby, alters the refractive index of the sensor. The variation in the refractive index can be determined from an interference pattern. Such patterns are obtained for the reflected power of a He–Ne laser of wavelength 632.8 nm as a function of temperature. SiC sensors have been fabricated by doping two quadrants of a 6 H - Si C chip with Ga and Al of dopant energy levels E V + 0.29 eV and E V + 0.23 eV , respectively. These doped regions exhibit distinct changes in the refractive index of SiC in the presence of carbon dioxide ( CO 2 ) and nitrogen monoxide (NO) gases respectively. Therefore Ga- and Al-doped 6 H - Si C can be used for sensing CO 2 and NO gases at high temperatures, respectively.

© 2010 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: January 7, 2010
Manuscript Accepted: February 18, 2010
Published: March 11, 2010

Citation
Geunsik Lim, Upul P. DeSilva, Nathaniel R. Quick, and Aravinda Kar, "Laser optical gas sensor by photoexcitation effect on refractive index," Appl. Opt. 49, 1563-1573 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-9-1563

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