Enhanced responsivity with skew ray excitation of reflection- and transmission-type refractometric sensors
Date
2014
Authors
Chen, G.Y.
Codemard, C.A.
Lewis, R.J.
Jankowski, L.
Chan, J.S.
Gorman, P.M.
Zervas, M.N.
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Journal article
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Optics Letters, 2014; 39(13):3822-3825
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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.
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Copyright 2014 Optical Society of America