Single mode fiber with surface waveguide, SPR biosensor and preparation method thereof

Abstract

The invention discloses a single mode fiber with a surface waveguide, an SPR biosensor and a preparation method thereof. The single mode fiber comprises: a fiber core and a cladding layer, which constitute a total reflection condition, wherein the cladding layer covers the fiber core, the cladding layer contains the surface waveguide therein, the surface waveguide is close to the surface of the cladding layer, the surface waveguide is written by the femtosecond laser direct writing waveguide technology, the surface waveguide is used to generate a strong evanescent field for exciting an SPR effect without destroying a physical structure of the optical fiber, so that the single mode fiber has relatively high mechanical strength, since the single mode fiber contains the surface waveguide, thelight wave energy in the fiber core can be guided to the surface of the fiber to generate the strong evanescent field, the fabrication is simple, the excitation efficiency is high, further, the SPR biosensor comprising the above single mode fiber also avoids the problems that the physical structure is destroyed and the mechanical strength is low, and the single mode fiber disclosed by the invention also has the advantages of high efficiency of exciting the SPR effect and simple preparation process.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a single-mode optical fiber with a surface waveguide, an SPR biosensor and a preparation method. Background technique [0002] At present, there are a variety of common optical fiber surface plasmon resonance (Surface Plasmon Resonance, SPR) sensors on the market, such as micro-nano fiber-coupled SPR sensors, side-polished fiber-coupled SPR sensors, tilted fiber grating-coupled SPR sensors and Photonic crystal fiber-coupled SPR sensor. However, the above-mentioned SPR sensor has various problems. details as follows: [0003] Among them, the micro-nano fiber-coupled SPR sensor stretches the multi-mode fiber or single-mode fiber to make it thinner. When the waveguide is thinner to a certain extent, a strong evanescent field will be generated on the surface, and a certain thickness of The metal layer, the evanescent field can effectively excite the plasmon to resonate and produce...

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a single-mode optical fiber with surface waveguide, SPR biosensor and preparation method, aiming to solve the problem that the physical structure of the optical fiber SPR sensor in the prior art is destroyed, the mechanical strength is reduced, and the efficiency of stimulating the SPR effect Low, technical problems such as complex preparation process

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