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

Guoguo Kang; Ismo Vartiainen; Benfeng Bai; Jari Turunen

doi:10.1364/OE.19.000770

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

Guoguo Kang^*, Ismo Vartiainen, Benfeng Bai, Jari Turunen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

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.

Original language	English
Pages (from-to)	770-778
Number of pages	9
Journal	Optics Express
Volume	19
Issue number	2
DOIs	https://doi.org/10.1364/OE.19.000770
Publication status	Published - 17 Jan 2011
Externally published	Yes

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title = "Enhanced dual-band infrared absorption in a Fabry-Perot cavity with subwavelength metallic grating",

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.",

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AU - Kang, Guoguo

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AU - Bai, Benfeng

AU - Turunen, Jari

PY - 2011/1/17

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AB - 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.

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

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