Antimonene, Barium Titanate and Silver Layer–Based Surface Plasmon Resonance Sensor for Dental Application: A Numerical Analysis

One of the most promising techniques for the study of the optical properties of dental materials is the use of surface plasmon resonance (SPR). This optical phenomenon occurs when a monochromatic light beam is incident on a conductive metallic surface. Conventional terms include a prism with a thin film coating of a noble metal, e.g. gold or silver and a 2-dimensional or dielectric material. Interaction of the light metal leads to the oscillation of electrons in the conduction band, thus inducing SPR at the metal–dielectric interface. The phenomenon can be utilized to measure various optical parameters of teeth, e.g. sensitivity and reflectance. A prototype sensor was designed and tested to evaluate the parameters using MATLAB software in combination with the characteristic transfer matrix (CTM). Various performance parameters of interest to the sensor were studied, including a full width at half maximum (FWHM) of 6.266°, a sensitivity of 190.48° per refractive index unit (deg/RIU), a figure of merit of 30.401 RIU⁻¹, and detection accuracy of 0.159 degree⁻¹. The results show that the proposed sensor is useful for biomedical applications.