Realization of sucrose sensor using 1D photonic crystal structure vis-à-vis band gap analysis

Abstract

A 1D photonic crystal based biosensor is explored for effective sensing of sucrose concentration in an aqueous solution. The proposed structure is realized with SOI based LiNbO3–air–LiNbO3 configuration, where thickness of LiNbO3 and air layer are considered as 650 nm and 350 nm respectively. Reflected light energy from the structure is computed through analysis of a photonic band gap (PBG) by employing finite difference time domain technique. Simulations are carried out for investigation of shifts in reflected wavelength, PBG edges, PBG width, diffraction loss, reflected light energy, transmitted light energy, sensitivity and limit of detection (LOD) with reference to various sucrose concentrations. From the comparative analysis of vital sensing parameters with the existing researches, the proposed photonic sensor shows better sensitivity and low LOD which is suitable for bio sensing applications.