Bisymmetric PCF-SPR (Photonic Crystal Fiber based Surface Plasmon Resonance) probe capable of working under high-refractivity solution environment

Abstract

The invention relates to an optical fiber probe and in particular relates to a bisymmetric PCF-SPR (Photonic Crystal Fiber based Surface Plasmon Resonance) probe capable of working under a high-refractivity solution environment. A central air hole is formed in a cladding layer of a photonic crystal optical fiber; eight outer-layer small air holes and outer-layer large air holes, which are crosslyarrayed in an octagonal shape, are formed in the periphery of the central air hole; a silver-graphene composite film is plated on an outer wall of the cladding layer. When light is emitted into the two photonic crystal optical fibers, the light with different wavelengths are transmitted in the optical fibers by adopting a specific mode along the axis center direction and surface plasmon waves aretransmitted in the silver-graphene composite film by adopting a fixed mode. When the light with the certain wavelength in the optical fibers is the same as a wave vector of the surface plasmon waves in the silver-graphene composite film, energy coupling occurs in the silver-graphene composite film and the light in the optical fibers can be coupled into the silver-graphene composite film so that light energy in the optical fibers is reduced. The light wavelength corresponding to maximum energy consumption is resonance wavelength.

Description

Technical field: [0001] The invention relates to an optical fiber probe, in particular to a double symmetrical PCF-SPR probe working in a high refractive index solution environment. Background technique: [0002] Surface Plasmon Resonance (SPR) is a relatively special physical optics phenomenon, and it is also an optical sensing technology used to detect changes in the refractive index of a medium. Because surface plasmon resonance sensing technology has outstanding advantages such as no need for marking, real-time detection, strong anti-interference ability, high sensitivity, and simple structure, it has broad prospects in many fields such as biology, medical treatment, environmental protection, and energy. [0003] Compared with the well-known traditional optical fiber, Photonic Crystal Fiber (PCF) contains small air holes arranged in different modes and periodically in order to make its internal refractive index distribution more flexible. . In recent years, photonic cr...

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Problems solved by technology

However, the current PCF-SPR sensor is generally suitable for b

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