Surface plasmon resonance

Photonic-crystal fiber

Physics

Nanotechnology

Photonic crystal

Electron beam physical vapor deposition

Optics

Nanoparticle

Composite material

Fiber optic sensor

Materials science

Graphene

Chemical vapor deposition

Refractive index

Optoelectronics

Fiber

Wavelength

Sensors

A surface plasmon resonance (SPR) liquid refractive index sensor based on photonic crystal fiber (PCF) is proposed. The PCF is made of the exposed core structure, and the gold film is formed by electron beam evaporation within its defects. The sensitivity of the sensor is improved by coating graphene on the surface of the gold film. The experimental results show that the sensitivity of the sensor is increased by 390 nm/RIU after the introduction of graphene, and finally to 2290 nm/RIU. The experiment and simulation have a good consistency. Significantly, the sensor can be reused, and the measurement accuracy can be maintained.

Graphene-Enhanced Surface Plasmon Resonance Liquid Refractive Index Sensor Based on Photonic Crystal Fiber