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A polarization-insensitive spr sensing structure

A polarization-insensitive, sensing technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve problems such as high cost, low integration and stability, and achieve cost reduction, improved integration and stability. Sexuality, the effect of a good SPR response

Active Publication Date: 2018-06-19
LINGNAN NORMAL UNIV
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Problems solved by technology

[0004] The present invention provides a polarization-insensitive SPR sensor structure with low cost, high integration and stability in order to overcome the defects of high cost, low integration and stability described in the prior art

Method used

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  • A polarization-insensitive spr sensing structure

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Embodiment 1

[0022] Such as figure 1 As shown, a polarization-insensitive SPR sensing structure, the SPR sensing structure includes the first prism ad-bchf, the second prism dh-afge and two sensing films with the same parameters, so The sensing film is a thin film capable of stimulating SPR;

[0023] The three edges of the first triangular prism ad-bchf are respectively ad, bc, fh and fh / / ad / / bc, and the three sides of the first triangular prism ad-bchf are respectively the first incident mirror surface abcd, the first The exit mirror surface afhd and the first bottom surface bchf, the angle between the first bottom surface bchf and the first incident mirror surface abcd and the first exit mirror surface afhd is equal, that is, △abf is an isosceles triangle;

[0024] The three edges of the second triangular prism dh-afge are respectively dh, af, eg and dh∥af∥eg, and the three sides of the second triangular prism dh-afge are respectively the second incident mirror surface afhd, the second ...

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Abstract

The invention provides a polarization insensitive type SPR sensing structure which comprises a first triple prism, a second triple prism and two sensing membranes with the same parameters, light of the polarized component P in incident light of any polarization state excites SPR on the first bottom face of the first triple prism, and light of the polarized component S excites SPR on the second bottom face of the second triple prism. According to the polarization insensitive type SPR sensing structure, good SPR response can be obtained without P polarization treatment conducted on the incident light with a polarizer, the SPR response is unrelated to the polarization state of the incident light, and cost is lowered effectively, integrity and stability of a sensing system are improved; besides, the polarization insensitive type SPR sensing structure can be combined with optical fibers conveniently, an optical fiber-prism combined type SPR sensor is formed, and the SPR sensor is used for wavelength modulation or strength modulation sensing.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, and more specifically, to a polarization-insensitive SPR sensing structure. Background technique [0002] The most important application of sensing technology based on the principle of surface plasmon resonance (Surface Plasmon Resonance, SPR) is to detect the refractive index of the substance to be measured. The composition of substances and the interaction between substances can often be reflected by the changes in the refractive index of the associated substances. Since the 1980s, the sensing technology based on the SPR principle has developed rapidly. At present, the sensing technology has been widely used in the fields of physics, biology, chemistry, environmental protection, and medicine. According to the modulation method of light waves, SPR sensors can be divided into five types: angle modulation type, wavelength modulation type, intensity modulation type, phase modulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552G01N21/41
CPCG01N21/41G01N21/55
Inventor 李松权杨倩梁枫
Owner LINGNAN NORMAL UNIV
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