Abstract
An H-shaped photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed for detecting large refractive index (RI) range which can either be higher or lower than the RI of the fiber material used. The grooves of the H-shaped PCF as the sensing channels are coated with gold film and then brought into direct contact with the analyte, which not only reduces the complexity of the fabrication but also provides reusable capacity compared with other designs. The sensing performance of the proposed sensor is investigated by using the finite element method. Numerical results show that the sensor can work normally in the large analyte RI (na) range from 1.33 to 1.49, and reach the maximum sensitivity of 25,900 nm/RIU (RI units) at the na range 1.47–1.48. Moreover, the sensor shows good stability in the tolerances of ±10% of the gold-film thickness.
Highlights
The surface plasmon resonance (SPR) phenomenon has been widely studied and applied in medical diagnostics, environmental monitoring, and biochemical research due to its high sensitivity, real-time and label-free monitoring [1,2,3,4,5,6]
We propose an open structure photonic crystal fiber (PCF)-SPR sensor design that solves the
It is necessary to investigate the effect of the fabrication tolerances of the gold film on the we present the sensitivities of the sensor at different na with gold-film thickness at 30 nm, 40 nm, sensing theInsensor
Summary
The surface plasmon resonance (SPR) phenomenon has been widely studied and applied in medical diagnostics, environmental monitoring, and biochemical research due to its high sensitivity, real-time and label-free monitoring [1,2,3,4,5,6]. Most commercial SPR sensors are based on a prism structure Because these structures require optical and mechanical components, they have the disadvantages of bulky configuration and high cost, which limits their practical application [1,2,3,4]. Using optical fiber-based SPR instead of a bulky prism can improve the integration degree. In these fiber-based designs, the fiber jacket is physically or chemically removed to expose the core to the sensing region in order to enhance the coupling between the core mode and the surface plasmon polariton (SPP) modes [1,2,3,4,5,6]. By introducing air holes in the core area of the PCF, the effective refractive index (neff )
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