On the sensitivity of optical fiber surface plasmon resonance based sensor for detection of dielectric analytes using COMSOL Multiphysics

Due to the importance of the public health toward the exposure to hazardous gases, real-time and sensitive gas sensors are among the priorities at present. Among different types of gas sensors, optical sensors with advantages like high sensitivity, low cost, miniaturization, and online monitoring have received great attention between the researchers. In this article, a fiber optic sensor based on surface plasmon resonance (SPR) of gold thin film is simulated by COMSOL Multiphysics. For this purpose, a single-mode optical fiber was considered to be uncladed on its middle part and coated with a thin film of gold and the sensitivity and resonance condition of the device was investigated as a function of thickness of the metal.