And surfaces of inner and outer thin cladding layers of hollow double-core are coated with PCF-SPR probes on two sides

Abstract

The invention relates to an optical fiber probe. The invention relates to a probe, in particular to a double-side-coated hollow double-core PCF-SPR probe which works in a solution environment and hashigh sensitivity. The double-side coated hollow double-core PCF-SPR probe is a photonic crystal fiber, a central air hole is formed in a cladding of the photonic crystal fiber, an inner gold film is coated on the inner wall of the central air hole, an outer gold film is coated on the outer wall of the cladding, and two fiber cores are positioned between the inner gold film and the outer gold filmand are symmetrically distributed to form the double-core symmetrical photonic crystal fiber. The probe can enable the fiber core guide mode and the plasma films on the two sides to resonate at the same time; the resonance phenomenon is obviously enhanced compared with single-side coating; the average spectral sensitivity of the fluorescent probe is 22571.43 nm / RIU; the average spectral sensitivity is 20 times that of a single-side coating film; the wide working wavelength range is 1000 nm to 3400 nm; the device is simple in structure, reasonable in design, affordable and easy to apply practically.

Description

Technical field: [0001] The invention relates to an optical fiber probe, in particular to a double-sided coated hollow double-core PCF-SPR probe with high sensitivity working in a solution environment. Background technique: [0002] Surface Plasmon Resonance (SPR) is a new type of modern optical sensing technology that has emerged internationally in recent years and integrates application and development. It is a relatively special physical optical phenomenon. Because of its strong anti-electromagnetic interference ability, real-time monitoring, no labeling, high sensitivity and simple structure, it has extremely broad application prospects in many fields such as biomedicine, environmental monitoring, and petrochemical industry. Because it is extremely sensitive to small changes in the refractive index of the external medium, it is an optical sensing technology used to detect changes in the refractive index of the medium. [0003] Photonic Crystal Fiber (PCF) is a waveguide...

AI Technical Summary

Problems solved by technology

At present, although relevant researchers have proposed a variety of different PCF-SPR sensing structures, in their proposed structures, the metal film is selectively plated on the inside of the air hole or outside the entire cladding. The sensitivity of the PCF-SPR probe is not high

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