Optical fiber sensor based on SPR enhancement

An optical fiber sensor, optical fiber sensing technology, applied in the direction of instruments, scientific instruments, material analysis by optical means, etc., can solve the problems of low sensitivity, complex production, complex structure, etc., to achieve high sensitivity, good optical fiber sensing performance, The effect of high optical fiber sensing performance

Pending Publication Date: 2022-05-06
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a fiber optic sensor based on SPR enhancement, in order to solve the problems of low sensitivity, complex structure, complicated manufacture and large device size of existing fiber optic sensors

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  • Optical fiber sensor based on SPR enhancement
  • Optical fiber sensor based on SPR enhancement

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0017] The invention realizes optical fiber sensing by means of SPR enhancement.

[0018] The invention proposes a fiber sensor based on SPR enhancement, which is characterized in that: it includes a broadband light source (1), a D-type optical fiber (2) coated with a periodic gold film, and a spectrometer (3); the D-type optical fiber (2) is a D-type optical fiber (2) that removes part of the optical fiber cladding (2-1) through side polishing, and the periodic gold film (2-3) is coated on the D-type optical fiber core (2-2) surface; when the light of the broadband light source (1) passes through the D-type optical fiber (2), SPR will be generated on the surface of the fiber core (2-2), and the periodic gold film (2-3) will cause the generated SPR to proceed coherent superposition, so as to achieve the effect of enhancing the SPR; the spectromete...

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Abstract

The invention provides an optical fiber sensor based on SPR (Surface Plasmon Resonance) enhancement, and relates to the technical field of optical fiber sensing, in particular to an optical fiber sensor based on SPR enhancement. The invention aims to solve the problems of low sensitivity, complicated structure, complicated manufacturing, large device size and the like of the existing optical fiber sensor in the field of optical fiber sensing. The device comprises a broadband light source, a D-type optical fiber coated with a periodic gold film, and a spectrograph. The method comprises the following steps: polishing the side surface of an optical fiber to remove part of an optical fiber cladding to obtain a D-type optical fiber, coating a layer of periodic gold film on the polished surface to excite an SPR (Surface Plasmon Resonance) effect, and coherently stacking the generated SPR effect to achieve the effect of enhancing the SPR, thereby realizing the detection of the refractive index of a to-be-detected substance. Compared with other SPR sensing devices, the device has the characteristics of simplicity in preparation, low cost, high quality factor and the like, and can be widely applied to the fields of biochemical sensing, environmental monitoring and the like.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber sensor based on SPR enhancement. Background technique [0002] Surface Plasmon Resonance (SPR) was gradually developed in the 1990s. Surface Plasmon Resonance is an optical phenomenon. Over the years, the application of surface plasmon resonance technology to biosensors has been highly researched. Sensors based on SPR technology are very sensitive to changes in the refractive index of the external environment. Due to their high sensitivity, high resolution, wide dynamic range, real-time detection, and easy fabrication, they are widely used in the fields of biology, chemistry, and medicine. . [0003] The working principle of the optical fiber SPR sensor is similar to that of the prism-coupled SPR sensor. The difference between them is that the interface that generates evanescent waves is different. The optical fiber SPR sensor replaces the interface between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/41G01N21/552G01N21/59
CPCG01N21/01G01N21/41G01N21/553G01N21/59G01N2021/5903
Inventor 李苗苗张留洋刘晓彤
Owner HARBIN UNIV OF SCI & TECH
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