ENHANCED ACETONE DETECTION SENSITIVITY USING TAMM RESONANCE AND SPR SENSOR WITH 1D PHOTONIC CRYSTALS

This study demonstrates the design of a highly sensitive acetone sensor based on surface plasmon resonance (SPR)-induced Tamm resonances within a one-dimensional photonic crystal (1D-PC) structure. The proposed sensor integrates a BK7 prism, a 70[Formula: see text]nm gold film, a 100[Formula: see text]nm air cavity, and a 1D photonic crystal composed of alternating MgF2 and Si layers with respective thicknesses of 250 and 150[Formula: see text]nm, all deposited on a glass substrate. The transfer matrix method (TMM)-based MATLAB and finite element method-based COMSOL Multiphysics 6.1 simulations are used for obtaining the results of the proposed work. The proposed sensor is capable of detecting any minute change in acetone concentration by shifting the Tamm resonance peak inside the photonic band gap due to the change in the refractive index of the acetone sample. The modeling results show that the proposed sensor achieves a maximum sensitivity of 1000[Formula: see text]nm/RIU under normal incidence, which can be further enhanced to 4000[Formula: see text]nm/RIU corresponding to 70 ∘ of incident angle under the s-polarized case. The highest recorded figure of merit (FOM) and quality factor (QF) values of the sensor are 2870.2 and 3520, respectively. The simple, label-free, and rapid detection capabilities of the proposed design may be useful for designing future sensors of different domains.