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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 12 — Dec. 1, 2012
  • pp: 3254–3258

Large-area microstructured photomixer as scannable detector of continuous-wave terahertz radiation

Armaghan Eshaghi, Mahmoud Shahabadi, Lukas Chrostowski, and Saeid Kamal  »View Author Affiliations


JOSA B, Vol. 29, Issue 12, pp. 3254-3258 (2012)
http://dx.doi.org/10.1364/JOSAB.29.003254


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Abstract

Detection of continuous-wave (CW) terahertz (THz) radiation is demonstrated using a large-area microstructured photomixer. The photomixer, which has interdigitated electrodes, is utilized in an incoherent detection scheme without any focusing optics for the incoming THz radiation. The large-area microstructured photomixer is driven at a high laser power of 900 mW, which results in an increased responsivity of 120 mA/W, in comparison with conventional small-area photomixer detectors. By mapping out the receiving pattern of the photomixer detector, we show that the large-area photomixer is capable of scanning the incident THz beam by changing the incidence angles of the CW laser beams used in the photomixing detection process. We demonstrate a scan range of ±50°. Moreover, the optimum spot size of the laser beams illuminating the photomixer detector for maximizing the responsivity of the detector is specified.

© 2012 Optical Society of America

OCIS Codes
(160.5140) Materials : Photoconductive materials
(190.7070) Nonlinear optics : Two-wave mixing

ToC Category:
Materials

History
Original Manuscript: June 27, 2012
Revised Manuscript: September 10, 2012
Manuscript Accepted: October 10, 2012
Published: November 8, 2012

Citation
Armaghan Eshaghi, Mahmoud Shahabadi, Lukas Chrostowski, and Saeid Kamal, "Large-area microstructured photomixer as scannable detector of continuous-wave terahertz radiation," J. Opt. Soc. Am. B 29, 3254-3258 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-12-3254


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