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Title: Low refractive index gas sensing using a surface plasmon resonance fibre device
Authors: Kalli, Kyriacos 
Allsop, Thomas D P 
Neal, Ron M. 
Davies, Edward M. 
Mou, Chengbo 
Bond, Peter R. 
Rehman, Saeed Ur 
Webb, David 
Calverhouse, P. 
Bennion, Ian 
Keywords: Fiber optics;Single-mode optical fibers;Spectral sensitivity;Chemical detectors;Optical fibers;Refractive index
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: Sep-2010
Publisher: Iop Science
Source: Measurement Science and Technology, 2010, vol. 21, no. 9, Article number 094029
Journal: Measurement Science and Technology 
Abstract: A series of surface plasmonic fibre devices were fabricated using multiple coatings deposited on a lapped section of a single mode fibre. Coupling from the guided mode to surface plasmons was promoted following UV laser irradiation of the coated region through a phase mask, which generated a surface relief grating structure. The devices showed high spectral sensitivities and strong coupling for low refractive indices as compared to other grating-type fibre devices. The plasmonic devices were used to detect the variation in the refractive indices of alkane gases with measured wavelength and coupling sensitivity to index of 3400 nm RIU -1 and 8300 dB RIU -1, respectively. As a demonstration of the performance of these gas sensors, a minimum concentration of 2% by volume of butane in ethane was achieved.
ISSN: 0957-0233
DOI: 10.1088/0957-0233/21/9/094029
Rights: © 2010 IOP Publishing Ltd.
Type: Article
Appears in Collections:Άρθρα/Articles

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