Efecto de una película fina depositada sobre un LPG en la medida del índice externo

Abstract

Long period gratings (LPG) have a number of attractive properties that may be exploited for sensing applications. LPG's exhibit sensitivity to the refractive index of the medium surrounding the fibre, which has been exploited to form sensors capable of measuring the refractive index of a solution, allowing concentrations of sodium chloride and ethylene glycol. In this paper a technique to improve the answer of these sensors is presented. It consists on the deposition of a thin film on the fiber by the Langmuir Blodgett deposition technique.