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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 17 — Jun. 10, 2011
  • pp: 2640–2653

Optical response of laser-doped silicon carbide for an uncooled midwave infrared detector

Geunsik Lim, Tariq Manzur, and Aravinda Kar  »View Author Affiliations


Applied Optics, Vol. 50, Issue 17, pp. 2640-2653 (2011)
http://dx.doi.org/10.1364/AO.50.002640


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Abstract

An uncooled mid-wave infrared (MWIR) detector is developed by doping an n-type 4H-SiC with Ga using a laser doping technique. 4H-SiC is one of the polytypes of crystalline silicon carbide and a wide bandgap semiconductor. The dopant creates an energy level of 0.30 eV , which was confirmed by optical spectroscopy of the doped sample. This energy level corresponds to the MWIR wavelength of 4.21 μm . The detection mechanism is based on the photoexcitation of electrons by the photons of this wavelength absorbed in the semiconductor. This process modifies the electron density, which changes the refractive index, and, therefore, the reflectance of the semiconductor is also changed. The change in the reflectance, which is the optical response of the detector, can be measured remotely with a laser beam, such as a He–Ne laser. This capability of measuring the detector response remotely makes it a wireless detector. The variation of refractive index was calculated as a function of absorbed irradiance based on the reflectance data for the as-received and doped samples. A distinct change was observed for the refractive index of the doped sample, indicating that the detector is suitable for applications at the 4.21 μm wavelength.

© 2011 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(040.3060) Detectors : Infrared
(040.5160) Detectors : Photodetectors
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Detectors

History
Original Manuscript: September 7, 2010
Revised Manuscript: January 12, 2011
Manuscript Accepted: February 12, 2011
Published: June 7, 2011

Citation
Geunsik Lim, Tariq Manzur, and Aravinda Kar, "Optical response of laser-doped silicon carbide for an uncooled midwave infrared detector," Appl. Opt. 50, 2640-2653 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-17-2640

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