Investigation of modal-interference-induced fiber optic refractive index sensor: markedly enhanced sensitivity realized by shining an optical vortex beam

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Arijit DattaAshish Shukla

Abstract

A highly sensitive multimode-interference-based refractive index sensor is reported here by shining an optical vortex beam. The sensor probe is formed by splicing a length of no-core fiber in between two air-core vortex fibers. The coupling characteristics of various modes inside the sensor and their effect on sensing properties are numerically analyzed. Simulation results show that the sensing scheme proffers a maximum sensing resolution of 7.59×10-6 and 4.18×10-6 RIU for no-core fiber length of 29.40 and 44.60 mm, respectively. Because of its high sensitivity, the study has potential applications in the chemical and biological sensing fields.

References

May 4, 2004·Applied Optics·Carmel RotschildStephen G Lipson
Feb 17, 2006·Optics Letters·Qian Wang, Gerald Farrell
Aug 12, 2006·Optics Letters·Waleed S MohammedXijia Gu
Nov 22, 2008·Applied Optics·Robert K TysonJaime Viegas
Sep 3, 2011·Optics Letters·J E Antonio-LopezD A May-Arrioja
Mar 5, 2013·Optics Letters·Andrey S OstrovskyVíctor Arrizón
Feb 3, 2016·Applied Optics·John E SaundersHans-Peter Loock

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