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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 770–778

Enhanced dual-band infrared absorption in a Fabry-Perot cavity with subwavelength metallic grating

Guoguo Kang, Ismo Vartiainen, Benfeng Bai, and Jari Turunen  »View Author Affiliations


Optics Express, Vol. 19, Issue 2, pp. 770-778 (2011)
http://dx.doi.org/10.1364/OE.19.000770


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Abstract

The performance of infrared (IR) dual-band detector can be substantially improved by simultaneously increasing IR absorptions for both sensor bands. Currently available methods only provide absorption enhancement for single spectral band, but not for the dual-band. The Fabry-Perot (FP) cavity generates a series of resonances in multispectral bands. With this flexibility, we introduced a novel type of dual-band detector structure containing a multilayer FP cavity with two absorbing layers and a subwavelength-period grating mirror, which is capable of simultaneously enhancing the middle wave infrared (MWIR) and the long wave infrared (LWIR) detection. Compared with the bare-absorption-layer detector (common dual-band detector), the optimized FP cavity can provide about 13 times and 17 times absorption enhancement in LWIR and MWIR bands respectively.

© 2011 OSA

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(230.0230) Optical devices : Optical devices
(230.5750) Optical devices : Resonators
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

History
Original Manuscript: November 12, 2010
Revised Manuscript: December 16, 2010
Manuscript Accepted: December 16, 2010
Published: January 5, 2011

Citation
Guoguo Kang, Ismo Vartiainen, Benfeng Bai, and Jari Turunen, "Enhanced dual-band infrared absorption in a Fabry-Perot cavity with subwavelength metallic grating," Opt. Express 19, 770-778 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-2-770


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