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Sensor chip based on waveguide coupling surface plasmon resonance

A surface plasmon and sensor chip technology, applied in the field of ion sensing, can solve the problems that limit the practical application of long-range SPPs detection

Inactive Publication Date: 2019-05-31
马佑桥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the harsh refractive index symmetry conditions severely limit the practical application of long-range SPPs detection.

Method used

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  • Sensor chip based on waveguide coupling surface plasmon resonance
  • Sensor chip based on waveguide coupling surface plasmon resonance
  • Sensor chip based on waveguide coupling surface plasmon resonance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example will combine figure 2 and image 3 Demonstrate the improvement of the detection performance of the waveguide coupling SPPs sensor chip proposed in the present invention.

[0020] In order to compare with the traditional SPPs sensor chip, figure 2 A schematic diagram of the traditional SPPs sensor chip structure is given: figure 2 (a) The thickness of the metal thin film layer 3 in the chip shown in (a) is 40 nanometers, and the material is silver; figure 2 The thickness of the metal thin film layer 5 in the chip shown in (b) is 40 nanometers, and the material is gold.

[0021] image 3 The reflectivity of the waveguide-coupled SPPs sensor chip and the traditional SPPs sensor chip are described. The solid line and the dotted line represent the reflectivity before and after the change of 0.001 in the refractive index of the sample to be tested. The angular sensitivity is defined as the change rate of the SPPs resonance angle compared with the measured...

Embodiment 2

[0023] This example will combine Figure 4 Demonstrate the adjustability of the evanescent field depth of SPPs.

[0024] Figure 4 The mode field strength distribution of waveguide-coupled SPPs is described: Figure 4 (a) The refractive index of the dielectric waveguide layer material is set to 2.198, Figure 4 (b) The refractive index of the dielectric waveguide layer material is set to 2.298. Depend on Figure 4 It can be clearly seen that as the refractive index of the material of the dielectric waveguide layer increases, the depth of the evanescent field of the waveguide-coupled SPPs mode becomes smaller. For example, when the refractive index of the material of the dielectric waveguide layer increases by 0.1, the depth of the evanescent field of the waveguide-coupled SPPs mode decreases half. The variable refractive index of the dielectric waveguide layer can be realized by thermo-optic or electro-optic effects. Therefore, this embodiment fully demonstrates that the ...

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Abstract

The invention discloses a novel sensor chip based on waveguide coupling surface plasmon resonance, and relates to the field of optical sensing, in particular to the field of surface plasmon sensing. The sensor chip comprises a substrate, an adhesive film layer, two metal film layers and a dielectric waveguide layer between the two metal film layers. Compared with a traditional surface plasmon chipdesign, the sensor chip can excite the waveguide coupling surface plasmon mode with relatively low ohmic loss to increase the quality factor value of a surface plasmon resonance peak and greatly improve the sensitivity of detection and analysis. By controlling the thickness and refractive index of the dielectric waveguide layer, the depth of the waveguide coupling surface plasma mode decay fieldcan be regulated and controlled, and the detection range of biomolecules of different sizes is expanded, and therefore, the design of the chip has a strong application value.

Description

technical field [0001] The invention relates to the field of optical surface plasmon sensing, in particular to a sensor chip based on a novel waveguide-coupled surface plasmon (Surface Plasmon Polaritons, SPPs) resonance. Background technique [0002] Surface Plasmon Polaritons (SPPs) resonance is an optical physical phenomenon. When the polarized laser light wave is transmitted to the metal interface and the incident angle is greater than the critical angle of total reflection, the so-called total reflection attenuation will be excited at the metal interface. Elapsed wave. When the propagation constant of the evanescent wave matches that of the SPPs, the two electromagnetic wave modes are strongly coupled and the SPPs mode is excited. The corresponding incident angle at this time is called the SPPs resonance angle. Since SPPs are the modes that exist near the metal interface, the changes in parameters such as refractive index, thickness, and temperature on both sides of t...

Claims

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Application Information

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IPC IPC(8): G01N21/552
Inventor 马佑桥
Owner 马佑桥
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