A D-Shaped SPR-Based PCF Bio-sensor with a High Sensitivity for Wide Refractive Index Detection
摘要
In this paper, a high-sensitivity biosensor for refractive index (RI) detection based on surface plasmon resonance (SPR) is proposed and analyzed. Based on the new D-shaped photonic crystal fiber (PCF). In the design, we chose gold on the polished part as the plasmonic material to improve the SPR effect. In addition, the numerical results were analyzed using the finite element method (FEM) for sensing applications. Accordingly, we measure RI at different wavelengths. The simulation results showed a high sensitivity of 12,300 nm/RIU in the RI range ranging from 1.27 to 1.41 and a maximum amplitude sensitivity AS of 1623.6 RIU−1, with a sensing RI resolution of 8.13 × 10−6 RIU and a maximum figure of merit (FOM) of 560 RIU−1. Due to the excellent parameters of the proposed sensor and the possibility of measuring larger RI ranges of the analyte, it is believed to be very useful in biomedicine and environmental sciences.