Abstract
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
∼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.
© 2014 IEEE
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