PCF refractive index sensor based on birefringence graphene-gold coating

A refractive index sensor and graphene technology, which is applied in the field of special optical fiber and optical fiber sensing, can solve the problems of low sensitivity, narrow sensing range, and large sensing loss, etc., and achieve the goal of improving sensitivity, high sensitivity, and high detection Effect

Pending Publication Date: 2021-10-19
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0005] There is still a lot of room for improvement in the above analysis, such as not too high sensitivity, narrow sensing range, relatively large sensing loss, etc.
Moreover, PCF is very difficult to prepare, so it is necessary to design a sensor with high sensitivity and low loss

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0019] The present invention is based on D-type graphene-gold coated PCF refractive index sensors, such as figure 1 As shown, the core-cladding structure is adopted, and the background material is silicon dioxide. The sensor is composed of a D-type PCF formed by polishing a part of the cladding area, a gold film, graphene and an unknown solution. The cladding area is composed of three air holes arranged in a hexagonal ring. The orthogonal direction of the fiber core in the first layer of air ring is composed of air holes with different diameters. The diameter of the largest air hole is D, and the diameter of the remaining air holes is the same as d. The PCF cladding area is polished by side polishing technology, and the poli...

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Abstract

The invention designs a PCF refractive index sensor based on D-type graphene-gold coating. The sensor is composed of a D-type PCF, a gold film and a graphene material, wherein the D-type PCF is formed by polishing a part of a cladding area. The sensitivity of the sensor is improved by mainly utilizing a graphene material to improve molecular adsorption on the surface of the gold film. The structure of the PCF utilizes the birefringence effect to enhance light excitation SPR, and the gold film is used as a plasma material to excite the SPR effect. The change of the refractive index of the unknown solution on the surface of the gold film can be obtained by accurately measuring the change of the resonant wavelength, so as to realize sensing detection. The sensor has the advantages of being simple in structure, high in sensitivity, low in loss and capable of achieving real-time detection through external sensing.

Description

(1) Technical field [0001] The invention relates to a D-type graphene-gold coated photonic crystal fiber (pohotonic crystal fiber, PCF) refractive index sensor, which belongs to the field of special optical fiber and optical fiber sensing. (2) Background technology [0002] Surface plasmon resonance (SPR) is a physical phenomenon that occurs on a dielectric metal surface. When a beam of light propagates in the fiber core with total reflection to generate evanescent waves, the evanescent waves penetrate the fiber cladding in the form of standing waves to excite the metal to generate free electrons, and the collectively oscillating free electrons will generate plasma along the propagation direction body wave. The SPR phenomenon can be observed when the wavelength or angle of the incident light is changed so that the frequency of the plasma wave is equal to the frequency of the evanescent wave. [0003] Due to the structural diversity of photonic crystal fiber (PCF), the surf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/23
CPCG01N21/23
Inventor 杨宏艳刘孟银梅梓洋苑立波
Owner GUILIN UNIV OF ELECTRONIC TECH
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