Metal micro-nano structure for improving Raman scattering of molecule

A micro-nano structure and Raman scattering technology, applied in the micro-nano field, can solve the problems of low enhancement factor and expensive equipment

Inactive Publication Date: 2010-08-11
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is: to overcome the disadvantages of low Raman scattering enhancement factor and expensive equipment in the prior art, and provide a metal micro-nano structure with high enhancement factor, so that the Raman scattering of the molecules to be measured can be maximized.

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  • Metal micro-nano structure for improving Raman scattering of molecule
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  • Metal micro-nano structure for improving Raman scattering of molecule

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Embodiment 1

[0042] This embodiment is to strengthen the metal micro-nano structure of glucose solution.

[0043] The realization process is as follows: (1) According to the small molecular structure of the detection molecule glucose, discrete dipole approximation (DDA) is selected as the electromagnetic field calculation method, and the calculation capacity of the workstation is about 8G;

[0044](2) The input division grid is 1024×1024 matrix, the surrounding medium environment condition is air, the refractive index is 1, and the excitation light is 442nm laser; the metal gold is selected, the characteristic size is 50nm, the period is 300nm, and the regular hexagonal arrangement Triangular array with a thickness of 20nm;

[0045] (3) Using computational simulation methods to simulate the extinction characteristics Qext, absorption characteristics Qabs and scattering characteristics Qsca of metal micro-nano structures; absorption characteristics Q abs =C abs / πa 2 eff , where C abs ...

Embodiment 2

[0052] This embodiment is a metal micro-nano structure that reinforces solid molecules. (1) According to the fact that the molecular structure and wavelength of the probe are basically equivalent, the FDTD electromagnetic field calculation method is selected, and the calculation capacity is about 2G; (2) The input grid is 512×512 matrix, the excitation light is 365nm laser, and metal silver is selected, and the characteristic size is 150nm, a period of 350nm, a diamond-shaped array arranged in a quadrilateral, and a thickness of 120m; (3) Use computational simulation methods to simulate the extinction characteristics Qext, absorption characteristics Qabs and scattering characteristics Qsca of metal micro-nano structures; (4) Calculate and simulate metal micro-nano structures The plasmon resonance frequency of the structure is 360nm, and compared with the system excitation light frequency of 365nm, the two are basically equal, and directly transferred to the next step; (5) Calcu...

Embodiment 3

[0055] This embodiment designs a metal micro-nano structure that strengthens TNT gas molecules. (1) According to the detection of the small molecular structure of TNT, discrete dipole approximation (DDA) is selected as the electromagnetic field calculation method, and the calculation capacity is about 4G; (2) The input calculation grid is divided into a 980×980 matrix, and the surrounding medium is a vacuum with a magnetic field, The excitation light is 780nm, metallic silver is selected, and the characteristic size is 30nm. A triangular array with a period of 250nm and a quadrilateral arrangement, with a thickness of 50nm; (3) use computational simulation methods to simulate the extinction characteristics Qext, absorption characteristics Qabs and scattering characteristics Qsca of metal micro-nano structures; (4) calculate and simulate the metal micro-nano structures Plasma resonance frequency λ LSPR , and compared with the system excitation light frequency λex, the two are ...

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Abstract

The invention relates to a metal micro-nano structure for improving Raman scattering of molecule, which comprises the following steps: (1) estimating limitation of internal memory capacity of a computer; (2) determining parameters such as mesh partition, peripheral medium environment conditions and exciting light condition, and primarily determining initial parameters of the metal micro-nano structure; (3) calculating scattering property Qsca of the metal micro-nano structure; (4) calculating plasma resonant frequency gamma LSPR for simulating the metal micro-nano structure and comparing the plasma resonant frequency gamma LSPR with the system exciting light frequency gamma ex, if the plasma resonant frequency is basically equal to the system exciting light frequency, the next step is entered, and if the plasma resonant frequency is not equal to the system exciting light frequency, the parameters of the peripheral medium environment condition of the metal micro-nano structure is changed; (5) calculating Raman reinforcing factor of the metal micro-nano structure; (6) preparing the micro-nano structure through the parameters of the metal micro-nano structure obtained in the step (4); (7) and realizing the metalation of the micro-nano structure. The metal micro-nano structure can maximally strengthen the Raman scattering of the molecule to be tested, can realize the low-concentration detection, and is simple and practical.

Description

technical field [0001] The invention belongs to the field of micro-nano technology, relates to a metal micro-nano structure, in particular to a metal micro-nano structure that enhances molecular Raman scattering. Background technique [0002] Raman scattering (RS) is a kind of scattering phenomenon of light. When the photon of the monochromatic incident light interacts with the molecule to be measured, an inelastic collision occurs, energy exchange occurs between the photon and the molecule, and the photon changes the direction and frequency of motion. Scattering occurs. Raman spectroscopy was invented by C.V.Raman, an Indian physicist who won the Nobel Prize in 1930. Raman spectroscopy (RS) is called the fingerprint of molecules, which can be used for structural analysis and has clear directivity. However, since it is an absorption spectrum similar to infrared spectrum, its intensity is weak. [0003] At present, the research on the enhancement effect of Raman scattering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/01
Inventor 邓启凌杜春雷罗先刚杨兰英高宏涛尹韶云
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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