| 1. | Chen G.Y.♦, Codemard C.A.♦, Lewis R.J.♦, Jankowski Ł., Chan J.S.♦, Gorman P.M♦, Zervas M.N.♦, Enhanced responsivity with skew ray excitation of reflection- and transmission-type refractometric sensors, OPTICS LETTERS, ISSN: 0146-9592, DOI: 10.1364/OL.39.003822, Vol.39, No.13, pp.3822-3825, 2014 Abstract:The responsivity of optical fibers to refractive index can be enhanced using high-order skew rays compared with using meridional rays. Skew rays can have a much higher number of reflections with increased interaction length along the core–cladding interface, which gives rise to stronger interactions with the external medium. Reflection/transmission-type refractometric sensors based on twin-coupled-core and multimode fibers showed one/two orders of magnitude increase in responsivity with skew ray excitation. The responsivity and sensitivity for the two types are ∼2000%/RIU, ∼1400%/RIU, and 4.9×10−5 RIU, 7.0×10−5 RIU, respectively. Keywords:Fiber optics sensors, Fiber properties, Remote sensing and sensors, Propagation, Biological sensing and sensors Affiliations:| Chen G.Y. | - | University of Southampton (GB) | | Codemard C.A. | - | Advanced Laser Laboratory SPI Lasers (GB) | | Lewis R.J. | - | Cardiff University (GB) | | Jankowski Ł. | - | IPPT PAN | | Chan J.S. | - | University of Southampton (GB) | | Gorman P.M | - | Advanced Laser Laboratory SPI Lasers (GB) | | Zervas M.N. | - | University of Southampton (GB) |
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