title: Enhanced responsivity with skew ray excitation of reflection- and transmission-type refractometric sensors.
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.
authors: George Y
authors: GY
authors: Chen
authors: Christophe A
authors: CA
authors: Codemard
authors: Richard J
authors: RJ
authors: Lewis
authors: Lukasz
authors: L
authors: Jankowski
authors: Jaclyn S
authors: JS
authors: Chan
authors: Philip M
authors: PM
authors: Gorman
authors: Michalis N
authors: MN
authors: Zervas
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D005336:Fiber Optic Technology; D054023:Lasers, Semiconductor; D055100:Optical Fibers; D055620:Optical Phenomena; D012031:Refractometry / Q000295:instrumentation*