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Sensitivity enhancement of turn-around-point long period gratings by tuning initial coupling condition
P BISWAS, N BASUMALLICK, S BANDYOPADHYAY, K DASGUPTA, A GHOSH, S BANDYOPADHYAY
Published in Institute of Electrical and Electronics Engineers Inc.
2015
Volume: 15
   
Issue: 2
Pages: 1240 - 1245
Abstract
Long period grating (LPG) at turn-around-point (TAP) has been studied with a view to enumerate the dependence of sensitivity of a particular resonant mode at the TAP to surrounding refractive index on the initial coupling strength. It has been shown theoretically and also validated experimentally that sensitivity can be enhanced significantly by tailoring the coupling strength of the cladding mode at the resonant wavelength near the TAP. Sensitivity characteristics have been studied for surrounding refractive index in the range 1.335-1.360, which is of interest in the field of biosensors, where the sensitivity of conventional LPGs is relatively small. We could attain a sensitivity of ∼ 1850 RIU using a TAP-LPG with ∼ 3 -dB attenuation at resonance. © 2014 IEEE.
About the journal
JournalData powered by TypesetIEEE Sensors Journal
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN1530-437X