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High-sensitivity surface plasma resonance sensor

A surface plasmon and resonant sensor technology, which is applied in the field of sensors and sensing, can solve the problem of low sensitivity, and achieve the effects of good thickness controllability, saving materials and costs, and improving sensitivity

Inactive Publication Date: 2012-08-29
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect of low sensitivity of traditional surface plasmon resonance sensors, thereby proposing an easy-to-process high-sensitivity surface plasmon resonance sensor

Method used

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  • High-sensitivity surface plasma resonance sensor

Examples

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Embodiment Construction

[0023] figure 2 A schematic structural diagram of an example of a high-sensitivity surface plasmon resonance sensor according to the summary of the invention is given.

[0024] In this example, the wavelength λ of the input optical signal is selected as 632.8nm, and the material of coupling prism (201) and transparent dielectric substrate (202) is ZF3 glass, and its refractive index is 1.71239; The material of the dielectric thin layer (203) is silicon dioxide, and its refractive index is 1.457; the material of the high refractive index dielectric layer (204) in the multilayer dielectric layer is tantalum pentoxide, and its refractive index is 2.0373; The thin film layer (205) is made of gold with a refractive index of 0.1807+2.993i; the sample to be tested (206) is an aqueous solution with an initial refractive index of 1.33269 and later changed to 1.33270, and the refractive index difference Δn=0.00001.

[0025] In this example, n is 2, that is, a total of 2n+1=5 layers of...

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Abstract

The invention discloses a high-sensitivity surface plasma resonance sensor, which consists of a multi-layer medium layer, a transparent dielectric medium substrate (2) and a metal film layer (5), wherein the multi-layer medium layer is alternatively formed by a low-refractive-index medium thin layer (3) and a high-refractive-index medium thin layer (4), one side of the transparent dielectric medium substrate of the sensor is adjacent to a coupling prism (1), one side of the metal film layer is adjacent to a sample (6) to be tested, the total quantity of the low-refractive-index medium thin layer and the high-refractive-index medium thin layer in the multi-layer medium layer is of an odd number, the thickness of each layer is different from each other, and the low-refractive-index medium thin layer in the multi-layer medium layer is always adjacent to both the transparent dielectric medium substrate and the metal film layer. Compared with the traditional surface plasma resonance sensorbased on the single metal film layer, the sensitivity of the sensor is remarkably improved, at the same time the structure of the multi-layer medium layer is relatively simple, total thickness is smaller, the processing is easy, the cost is reduced, and stronger practical value can be realized.

Description

technical field [0001] The invention relates to the technical field of sensors and sensing, in particular to a high-sensitivity surface plasmon resonance sensor. Background technique [0002] A surface plasmon is a pattern of electromagnetic waves caused by the interaction of light and free electrons on the surface of a metal. This mode exists near the metal-dielectric interface, and its field strength reaches its maximum at the interface, and decays exponentially on both sides of the interface along the direction perpendicular to the interface. [0003] The generation of surface plasmons needs to meet certain conditions. Since the wave vector of the surface plasmon is larger than the light wave vector in the medium on the side of the interface where it exists at the same frequency, the surface plasmon can only be generated when the wave vector matching is satisfied, forming a surface plasmon resonance. Since the incident light is absorbed when the resonance occurs, the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N21/55G01N21/552
Inventor 郑铮姜宇卞宇生刘娅朱劲松
Owner BEIHANG UNIV
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