Biswas, Palas and Basumallick, Nandini and Dasgupta, Kamal and Bandyopadhyay, Somnath (2014) Response of strongly over-coupled resonant mode of a long period grating to high refractive index ambiance. Journal of Lightwave Technology, 32 (11). pp. 2072-2078. ISSN 0733-8724

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Over-coupling of the resonant band of interest has been found to have significant influence on the refractive index sensitivity of long period grating (LPG) for surrounding material having refractive index higher than the cladding material. In this paper we report, for the first time to the best of our knowledge, a quantitative analysis using the concept of radiation mode coupling that elaborates the influence of initial coupling strength on the response of LPG to high refractive index surrounding. The simulated results agree well with those obtained experimentally where it could be shown that that a suitably over-coupled resonant mode of LPG can have a sensitivity similar to 724 dB/RIU in the range of the ambient refractive index which is slightly higher than the cladding where the conventional LPGs have almost no sensitivity.

Item Type: Article
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 04 Dec 2014 06:24
Last Modified: 04 Dec 2014 06:24

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