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

Abstract

The invention provides a refractive index sensing device based on the surface plasmon resonance of an inclined optical fiber grating, which includes a broadband light source, a polarizer, a polarization controller, an optical isolator, and a sensor formed by a long-period optical fiber grating with a very large inclination angle and a metal film. Sensing probe and spectrum analyzer. The broadband light source generates wide-band incident light, and outputs a single polarized light after passing through the polarizer, polarization controller and optical isolator, and then imports it into the parameter-optimized sensing probe, where the polarized light is coupled to low-order or high-order polarized cladding modes and generate corresponding resonance peaks at the output; among them, s-polarized light is only coupled to s-polarized low-order or high-order cladding modes, and p-polarized light is coupled to low-order or high-order p-polarized cladding modes and in The plasma resonance wave is excited in the metal film; the change of the resonant wavelength of the output spectrum with the refractive index of the sample to be tested is recorded by the spectrum analyzer to realize the detection of the sample to be tested. The sensing device of the invention effectively enhances the degree of interaction between the sample to be tested and the surface plasmon 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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