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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 20 — Oct. 15, 2013
  • pp: 4037–4039

Design principle of Au grating couplers for quantum-well infrared photodetectors

Chi Zhang, Huiting Chang, Fangyuan Zhao, and Xinhua Hu  »View Author Affiliations


Optics Letters, Vol. 38, Issue 20, pp. 4037-4039 (2013)
http://dx.doi.org/10.1364/OL.38.004037


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Abstract

Based on analytic formulas and numerical simulations, we investigate the enhancement effect of Au gratings with spoof plasmon resonances on quantum-well infrared photodetectors (QWIPs) operating between 2 and 30 μm. It is found that a simple analytic formula can well estimate the resonant wavelengths of Au gratings. Using optimal grating parameters, the absorption in the QW active region can be enhanced by 4-5 times compared with that in the reference structure (without gratings and with an isotropic active region). For s-polarized light, a high enhancement (>1.4) can occur in a broad range of incident angle (|θ|<40°).

© 2013 Optical Society of America

OCIS Codes
(130.3060) Integrated optics : Infrared
(230.5160) Optical devices : Photodetectors
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Detectors

History
Original Manuscript: July 18, 2013
Revised Manuscript: August 24, 2013
Manuscript Accepted: September 3, 2013
Published: October 4, 2013

Citation
Chi Zhang, Huiting Chang, Fangyuan Zhao, and Xinhua Hu, "Design principle of Au grating couplers for quantum-well infrared photodetectors," Opt. Lett. 38, 4037-4039 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-20-4037


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