PCF-Based SPR Sensor for Alcohol Detection
Muhammad Mahir Mahmud, Shrabani Das, Faria Anowara Adhora, Md. Tabil Ahammed
Abstract
This paper presents the design and optimization of a photonic crystal fiber-based surface plasmon resonance (PCF -SPR) sensor for the precise detection of the refractive index of alcoholic beverages. Using numerical analysis with the finite element method (FEM), the sensor integrates a symmetrical PCF structure coated with a circular gold layer to enhance its interaction with the analyte. The proposed sensor demonstrates exceptional performance, achieving a maximum wavelength sensitivity of 37,166.67 nm/RIU, a resolution of 2.69x10-6 RIU, and a high figure of merit of 616.79 RIU-I. These characteristics highlight the sensor's suitability for accurate and cost-effective refractive index detection, offering a significant improvement over traditional method. The sensor's high sensitivity makes it an ideal candidate for real-time alcohol monitoring in industrial, environmental, and quality control applications, providing a reliable, time-efficient solution for detecting low-concentration alcohol solutions.