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Gus-Hansen displacement spr sensor based on m-z interference structure

An interference structure, M-Z technology, applied in the field of optical sensing, can solve the problems of limited Gus-Hansen displacement SPR sensor, etc., and achieve the effect of improving detection limit, detection accuracy, stability and signal-to-noise ratio

Active Publication Date: 2020-10-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This limits the application of the Gus Hansen displacement SPR sensor

Method used

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  • Gus-Hansen displacement spr sensor based on m-z interference structure
  • Gus-Hansen displacement spr sensor based on m-z interference structure
  • Gus-Hansen displacement spr sensor based on m-z interference structure

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0018] The present invention includes laser 1, polarization beam splitter prism 2, 3, SPR sensor module 6, beam splitter 7, 11, plane reflector 4, 5, 9, 10, wedge-shaped substrate 8, polarizer 12, light intensity detector 13 , the light emitted by the laser 1 is divided into two independent beams of TM light and TE light by the combination of the polarization beam splitter prism 2, 3 and the plane mirror 4, 5, and after passing through the sensing detection part SPR sensor module 6, the TM light is generated Goose-Hansen shift, through the combination of beam splitters 7, 11, plane mirrors 9, 10 and wedge-shaped substrate 8, transforms Goose-Hansen shift into optical path difference, and makes TM light and TE light interfere respectively. By controlling the polarization angle of the polarizer 13 to read the interference light intensity of the TM light and the TE light...

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Abstract

The invention discloses a Goos-Hanchen displacement type SPR (Surface Plasmon Resonance) sensor based on an M-Z interference structure. The sensor comprises a laser emitter, a polarization splitting prism, an SPR sensing module, a beam splitter, a plane reflector, a wedged substrate, a polarizing film and a light intensity detector, wherein laser is split into TE (Tangent Elevation) light and TM light in an accordant direction after passing through a polarization splitting prism and plane mirror group; after passing through the SPR sensing module, the TM light has slight Goos-Hanchen displacement when being compared with the TE light. When Goos-Hanchen displacement with sensing sample refraction index information is changed, the interference intensity of the TM light passing through an M-Zinterference structure can be changed. By adopting the sensor, the slight Goos-Hanchen displacement is precisely converted into an optical path difference, the interfence light intensity is detectedto reflect the optical path difference by using the light intensity detector, then the detection precision and the detection limit of the slight Goos-Hanchen displacement can be improved, and in addition, by taking the TE light as reference, the stability and the signal to noise ratio of a system can be improved.

Description

technical field [0001] The invention belongs to the field of optical sensing and relates to a Gus-Hansen displacement SPR sensor based on an M-Z interference structure. Background technique [0002] Surface plasmon resonance (hereinafter referred to as SPR) is a metal physical optics phenomenon. Under the condition of total reflection, the incident light will generate evanescent wave at the total reflection interface, and will produce Goose-Hansen shift at the same time. The so-called SPR phenomenon refers to the resonant absorption phenomenon that occurs when the evanescent wave and the surface plasmon wave of the sensor chip meet the wave vector matching. When the SPR phenomenon occurs, most of the energy of the incident light is coupled into surface plasmon waves, accompanied by the amplification of the Gus-Hansen shift. The incident light can be decomposed into the TM component and the TE component whose vibration directions are perpendicular to each other. Generally s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552
CPCG01N21/553
Inventor 刘振超王怡沁何赛灵
Owner ZHEJIANG UNIV