Salinity-Temperature Sensor using One-Dimensional Deformed Photonic Crystal

Abstract

In this paper, new salinity and temperature sensor according to deformed one-dimensional photonic structure is proposed. The structure is constructed by alternating the couple of layers Air/Fused-Silica P-times. In the middle of the structure, a cavity containing the seawater is inserted to mesure its salinity and temperature. The Transfer Matrix Method (TMM) is used to simulate the wave-transmittance spectra. It is showed that, the quality factor (Q-factor) of the resonance peaks depends to the repetitive number (P) of layers. After that, the thickness of the layers is deformed by changing the deformation degree (h). The parameters P and h are optimized to get the maximal Q-factor with the minimal number of layers and structure’s thickness. The best sensitivity [[EQUATION]] of the proposed salinity sensor is 558.82 nm/RFIU with a detection limit of 0.0034 RFIU. In addition, the best sensitivity [[EQUATION]] of the designed temperature sensor is 600 nm/RFIU with a detection limit of 0.0005 RFIU.