High-Sensitivity Gold-Coated Refractive Index Biosensor Based on Surface Plasmon Resonance

High-sensitivity gold-coated photonic crystal fiber (PCF) refractive index (RI) biosensor based on surface plasmon resonance (SPR) is proposed. To evaluate the sensing characteristics of the proposed sensor, the finite element method (FEM) is used. As a base material, silica is used and as a plasmonic material, 40-nm thickness gold layer is chosen. Resonance of electrons requires active plasmonic material. Gold is chosen because it has the highest plasmonic activity of all active plasmonic materials and offers the best resonance. The uppermost wavelength sensitivity response of 45,409.14 nm/RIU is obtained at RI 1.35. The maximum amplitude resolution, amplitude sensitivity response, birefringence, transmittance, coupling length, and dispersion of 2.52 x 10(-05), 7679.06 RIU-1, 3.1 x 10(-4), - 24.5 dB, 1,87,500 & mu;m, and - 7000 ps/(nm-km) are obtained respectively. The proposed sensor is a strong contender for detecting microfluidic analytes in the biosensor field for its exceptional sensitivity response, compact structural design, and tunable performance.

Automated summary

A high-sensitivity gold-coated photonic crystal fiber biosensor based on surface plasmon resonance is proposed in this paper. The sensing characteristics of the sensor are evaluated using the finite element method. Silica is used as the base material and a 40-nm gold layer is chosen as the plasmonic material. The sensor exhibits exceptional sensitivity response, compact structural design, and tunable performance, making it a strong contender for detecting microfluidic analytes in the biosensor field.