Sensing device based on tilted fiber grating surface plasmon resonance and parameter optimization method thereof

Abstract

The invention provides a refractive index sensing device based on tilted fiber grating surface plasmon resonance. The device consists of a broadband light source, a polarizer, a polarization controller, an optical isolator, a sensing probe formed by excessively tilted long period fiber grating and a metal film, and a spectrum analyzer. The broadband light source produces broadband incident light,after the incident light passes through the polarizer, the polarization controller and the optical isolator, single polarized light is output and is introduced into the parameter optimized sensing probe, the polarized light is coupled to a low order or high order polarization cladding mode in the sensing probe and produces a corresponding resonance peak at the output end. Specifically, the s polarized light is only coupled to an s polarization low order or high order cladding mode, the p polarized light is coupled to a low order or high order p polarization cladding mode and excites plasma resonance wave in the metal film. The spectrum analyzer records the variation situation of the output spectrum's resonant wavelength along with the refractive index of a to-be-tested sample, thus realizing detection of the to-be-tested sample. The sensing device provided by the invention effectively enhances the degree of interaction between the to-be-tested sample and the surface plasma resonance wave, and improves the sensing sensitivity and resolution.

Description

technical field [0001] The invention relates to the field of fiber grating biochemical medical sensor design, in particular to a sensor device based on inclined fiber grating surface plasmon resonance and a parameter optimization method thereof. Background technique [0002] Biochemical sensing technology has important research significance and wide application requirements in the fields of rapid diagnosis, in vivo detection, and environmental monitoring. It has become an urgent requirement to promote the development of related industries to explore new sensing mechanisms and develop new biochemical sensor devices, so as to broaden the application fields of biochemical sensor devices and improve their sensing detection sensitivity and sensing accuracy. Among the currently widely used biochemical sensor devices, sensors based on electrochemical detection are widely used. However, it is difficult for such sensors to realize real-time and rapid in-body (online) monitoring, poo...

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Problems solved by technology

[0007] However, conventional sensor structure designs are widely used in surface plasmon resonance sensors based on long-period fiber gratings (IEEE Photonics Technology Letter, 27(1), pp.46-49, 2015; Optics Express, 21(12 ), pp.13875-13895, 2013), did not use the high angular parameter cladding mode to excite the surface plasmon resonance wave, so its sensitivity cannot be further improved, which limits its application in biochemical sensing such as high sensitivity and high resolution requirements field application

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