SPR-based high-sensitivity photonic quasi-crystal fiber methane sensor

Abstract

The invention relates to a methane sensor, in particular to a SPR-based high-sensitivity photonic quasi-crystal fiber methane sensor, the methane sensor is a photonic quasi-crystal fiber, a cladding of the methane sensor is composed of two layers of air holes arranged according to a sextuple Penrose type quasi-crystal structure, the first layer is provided with six inner layer air holes, and the surrounding area is a fiber core; the second layer comprises eight outer-layer air holes, wherein the diameters of four inner-layer air holes above and below the fiber core are smaller than the diameters of the other two inner-layer air holes; and the photonic quasi-crystal fiber is made of silicon dioxide, the two sides of the photonic quasi-crystal fiber are symmetrically and laterally polished, the two laterally polished surfaces are plated with silver films, the surfaces of the silver films are coated with methane sensitive films, and the double-sided structure can effectively enhance the surface plasma resonance effect. The methane sensor is simple in structure, easy to manufacture and high in sensitivity, and the detection difficulty is reduced.

Description

Technical field: [0001] The invention relates to a methane sensor, in particular to an SPR-based high-sensitivity photon quasi-crystal fiber methane sensor. Background technique: [0002] Surface plasmon resonance (surface plasmon resonance, SPR) refers to the optical phenomenon caused by the free electron oscillation between the metal and the dielectric layer. When the incident light is totally reflected, when the evanescent wave and the surface plasmon wave resonate, resulting The strength is greatly weakened. The optical fiber surface plasmon resonance sensor is a combination of optical fiber technology and surface plasmon resonance technology to measure the refractive index. It has the advantages of small size, flexible design, fast response speed, high sensitivity, and long-distance continuous measurement. It can be used for Biomedical testing, environmental monitoring, food testing, biochemical sensing and other fields. [0003] Common fiber optic surface plasmon res...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned PCF-SPR methane sensor has a complex structure and needs to be coated on the inner wall of the air hole of the PCF. The manufacturing process is complicated, the success rate is low, and it is difficult to fill the air hole of the PCF with the gas to be measured, and the measurement sensitivity is low.

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