Abstract
A surface plasmon resonance (SPR) sensor based on a dual-side polished microstructured optical fiber (MOF) with a dual core is proposed for a large analyte refractive index (RI; na) detection range. Gold is used as a plasmonic material coated on the polished surface, and analytes can be directly contacted with the gold film. The special structure not only facilitates the fabrication of the sensor, but also can work in the na range of 1.42–1.46 when the background material RI is 1.45, which is beyond the reach of other traditional MOF-SPR sensors. The sensing performance of the sensor was investigated by the wavelength and amplitude interrogation methods. The detailed numerical results showed that the proposed sensor can work effectively in the na range of 1.35–1.47 and exhibits higher sensitivity in the na range of 1.42–1.43.
Highlights
Surface plasmon resonance (SPR) is a unique optical property, which refers to the resonance excitation of free electron oscillations at the interface between a metallic layer and a dielectric surface under a p-polarized light radiation, and is extremely sensitive to variations in the refractive index (RI)of the surrounding medium [1,2,3,4,5,6]
We have proposed and numerically investigated an surface plasmon resonance (SPR) sensor based on a dual-side polished microstructured optical fiber (MOF)
The gold and the analyte layers were placed outside the MOF structure, which can be expected to simplify the manufacturing process
Summary
Surface plasmon resonance (SPR) is a unique optical property, which refers to the resonance excitation of free electron oscillations at the interface between a metallic layer and a dielectric surface under a p-polarized light radiation, and is extremely sensitive to variations in the refractive index (RI). The phase-matching condition between the core mode and the surface plasmon polariton (SPP) mode of optical fiber-based SPR sensors is difficult to meet. Phase matching occurs only at higher frequencies, and high frequencies limit the penetration depth of the plasmon into the analyte, which reduces the sensitivity of the sensor. The dual core can reduce the impact of total reflection conditions on the optical fiber, so that the sensor can work at a wide range of na , especially at 1.42–1.46, in which range the other MOF-based SPR sensors cannot work [20,21,22,23,24,25,26]
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