D-Shaped Photonic Crystal Fiber Plasmonic Sensor Based on Silver-Titanium Dioxide Composite Micro-grating

• DOI: 10.1007/s11468-021-01468-9
• Publication Date: 2021-05-25T13:03:03Z
• Authors: Hairui Fang; Chenjing Wei; Hanrui Yang; Bo Zhao; Long Yuan; Jing Li
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

A D-shaped photonic crystal fiber surface plasmon resonance (PCF-SPR) sensor is proposed for highly sensitive liquid refractive index sensing. Taking sensing sensitivity into consideration, silver-titanium dioxide (Ag-TiO2) composite micro-grating is introduced and SPR is excited within Ag-TiO2 composite micro-grating at the flat D-shaped PCF surface. The finite element method (FEM) based on COMSOL is applied to analyzed numerically response characteristics of the D-shaped sensor, which was research dependent on wavelength and amplitude interrogation method. The results displayed that designed sensor reached excellent amplitude sensitivity of 2245 RIU−1 and wavelength sensitivity of 10,300 nm/RIU for liquid refractive index varying between 1.33 and 1.40. And it also shows that the maximum figure of merit was 480 RIU−1 for proposed sensor after optimization of structural parameters, which has a great prospect in the biological detection and chemical analysis.