Dual-channel fiber surface plasmon resonance sensor based on a metallized core

Abstract

We propose a novel dual-channel fiber surface plasmon resonance (SPR) sensor based on a metalized core. Using a polymer, the cladding and coating layer of the sensor coated with a metal sensing film are restored. The parameters of the sensor are determined after studying the influence of different polymers and sensing films on the dynamic range and sensing sensitivity. A silver film coated with UV-curable adhesive and a gold film coated with polydimethylsiloxane (PDMS) with respective sensing sensitivities of up to 1.39 and 1.48 nm/°C are selected after optimization to construct the dual-channel sensor. A dual-channel fiber SPR temperature compensation refractive index sensor with improved accuracy is then constructed with a 20-nm gold film for the refractive index sensing unit and a 50-nm gold film coated with PDMS for the temperature sensing unit. Owing to its complete fiber structure, the SPR sensor has good mechanical properties and high practical value, and it can be easily applied to real-time temperature measurements and temperature compensation in various fields.

Simulation Study of High Sensitivity Fiber SPR Temperature Sensor with Liquid Filling

“…The thermo-optic coefficient and expansion coefficient of silica are 7.8 × 10 −6 /°C and 4.1 × 10 −7 /°C, respectively [ 23 ]. Assuming the thermo-optic coefficient of the liquid as , the relationship between the refractive index of the filled liquid and the temperature can be evaluated by [ 24 ] where the is the refractive index of the filling liquid at room temperature T 0 . It can be obtained from the literature that when the ratio of ethanol and glycerol are 34% and 66%, respectively, and when the temperature is 25 °C, the refractive index is 1.436 and the thermo-optic coefficient is −2.8 × 10 −4 /°C [ 20 , 25 ].…”

Fiber cladding dual channel surface plasmon resonance sensor based on S-type fiber

“…A fiber cladding SPR dual channel sensor based on wave-length division multiplexing technology requires two sensing areas with inconsistent SPR working bands on the same fiber. [20][21][22][23] By employing the structural characteristics that (i) the working band of the few-mode fiber cladding SPR sensor based on S-type fiber with a thin core diameter is closer to long wavelengths, (ii) the working band of the multimode fiber cladding SPR sensor based on S-type fiber with a thick core diameter is closer to short wavelengths, and (iii) the multimode fiber can receive the light from the cladding of the fewmode fiber, a dual-channel SPR sensor with double S-type fiber cascade is constructed that effectively solves the difficulty of dual-channel realization of a fiber SPR sensor. along the fiber core in the single-mode straight fiber.…”