Surface plasma resonance sensor

A surface plasmon and resonance sensor technology, applied in the measurement of phase influence characteristics, etc., can solve problems such as increasing the difficulty and cost of instrument construction

Inactive Publication Date: 2012-03-28
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these instruments use advanced virtual instrument technology and embedded microcontroller as the main instrument system, due to the need for a

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Examples

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Embodiment 1

[0020] The period of the planar dielectric grating of the surface plasmon resonance sensor in this embodiment is 500 nm, the thickness is 60 nm, the azimuth angle of the grating vector K is 120°, the refractive index is 1.5, and the modulation degree is 0.15. The nano-thickness metal film is selected from precious metal silver film with a thickness of 100nm. The refractive index of the glass substrate is 1.46. Under the conditions of normal incidence and the refractive index of the environment is 1 or 1.1, it is obtained as figure 2 The detection spectrum shown.

[0021] The figure shows that the surface plasmon resonance absorption peak is sharp under the parameters of this example, and the full width half maximum (FWHH) is 4nm; on the other hand, the ambient refractive index changes by 0.1, the resonance wavelength changes by 42nm, and the sensitivity is 420nm per refractive index unit. This example has good ambient refractive index sensing performance with a figure of me...

Embodiment 2

[0023] The period of the planar dielectric grating of the surface plasmon resonance sensor in this embodiment is 500 nm, the thickness is 60 nm, the azimuth angle of the grating vector K is 120°, the refractive index is 1.5, and the modulation degree is 0.05. The nano-thickness metal film is selected from precious metal silver film with a thickness of 100nm. The refractive index of the glass substrate is 1.46. Under the condition that the refractive index of the environment is 1 or 1.1 and the incident angle is 0°, the following image 3 The detection spectrum shown. Compared with the parameters of Example 1, only the degree of refractive index modulation is reduced, by image 3 It can be seen that the position of the reflection resonance absorption peak has not changed, but the depth has become slightly shallower, while the sensitivity, full width half maximum and quality factor have not changed.

Embodiment 3

[0025] The period of the planar dielectric grating of the surface plasmon resonance sensor in this embodiment is 500 nm, the thickness is 60 nm, the azimuth angle of the grating vector K is 120°, the refractive index is 1.52, and the modulation degree is 0.1. The nano-thickness metal film is selected from precious metal silver film with a thickness of 100nm. The glass substrate has a refractive index of 1.72. Under the conditions of normal incidence and the refractive index of the environment is 1 or 1.1, it is obtained as Figure 4 The detection spectrum shown. and image 3 It is close, indicating that the small change in the refractive index of the grating due to the error caused by the solution of dichromated gelatin has little effect on the sensing performance.

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Abstract

The invention discloses a surface plasma resonance sensor based on plane dielectric grating coupling, which includes a plane dielectric grating, a nanometer thickness metallic membrane and a glass substrate, wherein the upper surface of the plane dielectric grating is contacted with an environmental medium; the change of the refraction ratio of the to-be-detected object in the environment leads to the change of the incident wave vector and further the change of the diffraction spectrum of the plane sine grating; the lower surface of the plane dielectric grating is connected with the nanometer thickness metallic membrane; the additional wave vector led in by the plane dielectric grating can be used for exciting the surface plasma resonance effect at the interface; the plane dielectric grating consists of photorefractive materials, and the dielectric constants thereof are in sine distribution in space; and the grating vector K of the plane dielectric grating can be inclined. The sensor is simple to prepare, can be developed in the aspects of low cost, integration and array as each layer adopts the plane structure and is easy to perform optical integration, has the advantages of stable work and high sensitivity, and provides an efficient research means in fields such as mine safety and air pollution.

Description

technical field [0001] The invention relates to the field of surface plasmon resonance sensors, in particular to a surface plasmon resonance sensor based on planar dielectric grid coupling. Background technique [0002] Surface plasmon resonance (SPR) is a physical phenomenon. When the incident light hits the interface of two media with different refractive indices (such as gold or silver coating on the glass surface) at a critical angle, it can cause the resonance of metal free electrons. The light energy is absorbed, so that a minimum peak can be seen in the response curve of the reflected light intensity. At this time, the corresponding incident light wavelength is the resonance wavelength, and the corresponding incident angle is the resonance angle. The surface plasmon sensor developed according to this principle has been widely used in the detection and analysis of the interaction between biomolecules. Because of its small size, high measurement accuracy, and strong a...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 熊学辉鲁平刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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