SPR Microstructured D-Type Optical Fiber Sensor Configuration for Refractive Index Measurement

Abstract

This paper presents the performance analysis of a sensing configuration of refractive index, based on surface plasmon resonance (SPR) in microstructured D-type optical fiber with a thin gold layer, using the finite-element method. The configuration is analyzed in terms of the loss and distribution Poynting vector. The results are compared with a conventional SPR D-type optical fiber sensor for refractive index measurement. The simulation results show an improvement of the sensitivity and resolution ( $10\times 10^{3}$ nm/RIU and $9.8\times 10^{-6}$ RIU, respectively, when considering an accurately spectral variation detection of 0.1 nm).