Biswas, Palas and Basumallick, Nandini and Bandyopadhyay, Sankhyabrata and Dasgupta, Kamal and Ghosh, Ajay and Bandyopadhyay, Somnath (2015) Sensitivity Enhancement of Turn-Around-Point Long Period Gratings By Tuning Initial Coupling Condition. IEEE Sensors Journal, 15 (2). pp. 1240-1245. ISSN 1530-437X

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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 similar to 1850 nm/RIU using a TAP-LPG with similar to 3-dB attenuation at resonance.

Item Type: Article
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 21 Dec 2015 09:10
Last Modified: 21 Dec 2015 09:10

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