Effect of induced inner curvature on refractive index sensitivity in internally tilted long-period gratings

Mojtaba Arjmand; Francesco Chiavaioli; Simone Berneschi; Francesco Baldini; Mahmood Soltanolkotabi; Cosimo Trono

doi:10.1364/OL.41.001443

Effect of induced inner curvature on refractive index sensitivity in internally tilted long-period gratings

Opt Lett. 2016 Apr 1;41(7):1443-6. doi: 10.1364/OL.41.001443.

Authors

Mojtaba Arjmand, Francesco Chiavaioli, Simone Berneschi, Francesco Baldini, Mahmood Soltanolkotabi, Cosimo Trono

PMID: 27192257
DOI: 10.1364/OL.41.001443

Abstract

A new complete analysis of the effect of induced inner curvature on refractive index (RI) sensitivity in internally tilted long-period gratings (ITLPGs) is presented. The responses in terms of RI sensitivity of a standard LPG and different ITLPGs with curvature values between 15 and 19 m^-1 were compared. The analysis suggests first, that the larger the induced curvature, the greater the RI sensitivity; and second, that the RI sensitivity exponentially increases with both the curvature and cladding mode order. RI sensitivity greater than 100 nm RIU^-1 can be attained with curvature greater than 25 m^-1 for LP₀₆ mode. Conversely, the temperature sensitivity of ITLPGs is comparable to standard LPGs for the considered cladding mode order.