High-sensitivity three-core photonic crystal fiber sensor based on surface plasmon resonance with gold film coatings

Abstract

A high-sensitivity three-core photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) is proposed in this paper. The gold film is selected as the plasmonic metal and coated on the outside surface of the PCF to excite the SPR phenomenon. There are three different diameter air holes of d1, d2, and d3 distributed on the cross-section of the sensor. Among them, sensor performance can be affected by changing the diameter of the central hole and the thickness of the gold film. The sensor shows the maximum confinement loss value and spectral sensitivity of 50 dB cm−1 and 30600 nm RIU−1, respectively, at analyte RI (na = 1.41), and the corresponding maximum resolution is 3.27 × 10–6. The above simulation result shows that the sensor has excellent performance, thus laying the foundation for future research.

A D-type dual side-polished, highly sensitive, plasma refractive index sensor based on photonic crystal fiber

“…The optimization process is to continuously adjust some parameters and keep the rest of the parameters unchanged. So far, many researchers [31][32][33][34] have adopted this approach. The parameters that need to be optimized are air hole diameters d 1 and d 2 , gold film thickness t, TiO 2 thickness g, adjacent air hole spacing Λ, and polishing depth D.…”

Investigations on the Dual-Core Photonic Crystal Fiber Sensor Based on Surface Plasmon Resonance with Two Segmented Tantalum Film Coating

“…Among them, silver (Ag), gold (Au), aluminum (Al), ITO, and metal composite materials are selected as plasmonic material and coated on the interior or exterior of the fiber to provide the SPR phenomenon occurrence condition. [27,28] Among them, silver shows sharp plasmonic resonance peaks in UV-vis range of electromagnetic spectrum and high sensitivity. Unfortunately, it suffers from the drawback of relatively poor stability in aqueous environments, which would limit their practical applications.…”