High sensitivity refractive index gas sensing enhanced by surface plasmon resonance with nano-cavity antenna array

doi:10.1088/1674-1056/21/8/087104

Abstract The surface plasmon resonance gas sensor is presented for refractive index detection using nano-cavity antenna array. The gas sensor monitors the changes of the refractive index by measuring the spectral shift of the resonance dip, for modulating the wavelength of incident light. It is demonstrated that minute changes in the refractive index of a medium close to the surface of a metal film, owing to a shift in the resonance dip of the wavelength, can be detected. The average detection sensitivity is about 3200 nm/RIU (refractive index units), which is twice more than that of metal grating-based gas sensor. The reflectivity of the surface plasmon resonance dip is only ～ 0.03%, and the full widths at half maximum (FWHMs) of bandwidth of the angle and wavelength are ～ 0.20° and 4.71 nm, respectively.

Keywords: subwavelength structures sensor resonators surface plasmons

Received: 21 November 2011
Revised: 13 January 2012
Accepted manuscript online:

PACS:	71.45.Lr	(Charge-density-wave systems)
	87.19.lt	(Sensory systems: visual, auditory, tactile, taste, and olfaction)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund: Project supported by the Natural Science Foundation of Chongqing Science and Technology Program, China (Grant No. CSTC, 2010BB2352) and the Fund of Chongqing Education Committee (Grant No. KJ121224).

Corresponding Authors: Zhao Hua-Jun
E-mail: zhaohjcu@163.com

Cite this article:

Zhao Hua-Jun (赵华君 ) High sensitivity refractive index gas sensing enhanced by surface plasmon resonance with nano-cavity antenna array 2012 Chin. Phys. B 21 087104

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High sensitivity refractive index gas sensing enhanced by surface plasmon resonance with nano-cavity antenna array

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