title: Effect of induced inner curvature on refractive index sensitivity in internally tilted long-period gratings.
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-1were 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-1can be attained with curvature greater than 25  m-1for LP06mode. Conversely, the temperature sensitivity of ITLPGs is comparable to standard LPGs for the considered cladding mode order.
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Arjmand
authors.forename: Francesco
authors.initials: F
authors.lastname: Chiavaioli
authors.forename: Simone
authors.initials: S
authors.lastname: Berneschi
authors.forename: Francesco
authors.initials: F
authors.lastname: Baldini
authors.forename: Mahmood
authors.initials: M
authors.lastname: Soltanolkotabi
authors.forename: Cosimo
authors.initials: C
authors.lastname: Trono