Journal
OPTICS EXPRESS
Volume 22, Issue 8, Pages 8943-8948Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.008943
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Funding
- National Natural Science Foundation of China [61265001, 11264016]
- Natural Science Foundation of Jiangxi Province, China [20122BAB202005]
- Scientific Research Foundation of Jiangxi Provincial Education Department [GJJ13236, GJJ13237, GJJ12172]
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We present a novel and simple optical structure, i.e., the symmetrical metal-cladding waveguide, in which a polymer layer is added into the guiding layer, for sensitive detection of chemical vapor by using the enhanced Goos-Hanchen (GH) shift (nearly a millimeter scale). Owing to the high sensitivity of the excited ultrahigh-order modes, the vapor-induced effect (swelling effect and refractive index change) in the polymer layer will lead to a dramatic variation of the GH shift. The detected GH shift signal is irrelevant to the power fluctuation of the incident light. The detection limit of 9.5 ppm for toluene and 28.5 ppm for benzene has been achieved. (C) 2014 Optical Society of America
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