6533b86cfe1ef96bd12c82be
RESEARCH PRODUCT
A Refractive Index Sensor Based on the Resonant Coupling to Cladding Modes in a Fiber Loop
Antonio DiezEnrique SilvestreMauricio ReyesMiguel V. AndresDavid Monzón-hernándezAlejandro Martínez-ríosJose L. Cruzsubject
All-silica fiberMaterials scienceTransducersPhysics::Opticslcsh:Chemical technologyBiochemistryGraded-index fiberRessonància magnètica nuclearArticleAnalytical ChemistryDouble-clad fiberOpticsFiber Optic Technologylcsh:TP1-1185Electrical and Electronic EngineeringInstrumentationbusiness.industryoptical fiber devicesrefractive index sensormode couplingEquipment DesignLong-period fiber gratingCladding (fiber optics)Atomic and Molecular Physics and OpticsÒptica Aparells i instrumentsEquipment Failure AnalysisSolutionsRefractometryNormalized frequency (fiber optics)businessStep-index profilePhotonic-crystal fiberdescription
We report an easy-to-build, compact, and low-cost optical fiber refractive index sensor. It consists of a single fiber loop whose transmission spectra exhibit a series of notches produced by the resonant coupling between the fundamental mode and the cladding modes in a uniformly bent fiber. The wavelength of the notches, distributed in a wavelength span from 1,400 to 1,700 nm, can be tuned by adjusting the diameter of the fiber loop and are sensitive to refractive index changes of the external medium. Sensitivities of 170 and 800 nm per refractive index unit for water solutions and for the refractive index interval 1.40-1.442, respectively, are demonstrated. We estimate a long range resolution of 3 × 10(-4) and a short range resolution of 2 × 10(-5) for water solutions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-08-01 | Sensors (Basel, Switzerland) |