Salinity Sensor Based on 1-D Photonic Crystals by Tamm Resonance With Different Geometrical Shapes

Abstract

Abstract In this paper, we demonstrate a novel Salinity sensor based on Tamm-Plasmon-polariton (TPP), comprising of different shapes of Bragg reflector (ordinary, texturing, and Sawtooth) and metallic layer, is proposed. The finite element method is used to study the considered structure and sensing performance by using the COMSOL multiphysics simulation procedure. Here, we study the effect of surface morphology on the sensitivity; firstly, in the case of one-dimensional photonic crystals centered defect, it has a negative effect on the sensitivity, secondly, texturing and sawtooth in the case of Tamm resonance is increase the sensitivity as For texturing the surface, the sensitivity (S) = 569nm/RIU, quality factor (Q) =236, and figure of merit (FOM)= 170 RIU-1. While, for Sawtooth surface, S = 612.29nm/RIU, Q = 272.4, and FOM = 199RIU-1. The consequences of structural parameters on the efficiency of sensing are studied and new procedures are proposed to enhance TPP-based sensors. A simple and functional alternative to conventional salinity sensors may be the proposed solution.