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Enhancement method for raman scattering by using artificial metal micro-nano structure

A Raman scattering enhancement and micro-nano structure technology, applied in the micro-nano field, can solve the problems of low detection sensitivity and low efficiency of molecular Raman scattering, and achieve the effect of ensuring repeatability and stability

Inactive Publication Date: 2010-07-14
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is: to overcome the random and incoherent output produced by existing rough metal surfaces and nano-metal sols, to improve the shortcomings of low molecular Raman scattering efficiency and low detection sensitivity, and to provide an artificial metal micro-nano structure to realize The method of Raman scattering enhancement realizes the efficient and maximized output of Raman scattering of the molecules to be measured, and realizes high-sensitivity detection

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  • Enhancement method for raman scattering by using artificial metal micro-nano structure
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  • Enhancement method for raman scattering by using artificial metal micro-nano structure

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Embodiment 1

[0025] Using the nano monomer structure to realize the detection of unimolecular gas molecules with a low detection limit, the steps are as follows:

[0026] (1) Since the detection object is a monomolecular gas, the Raman enhancement factor EF1 is set to 1×10 5 , using nano-monomer structures to achieve Raman scattering enhancement. The distance between each particle is relatively large compared to the characteristic size of the structure, and only the enhancement effect of the monomer on Raman scattering is considered without considering the interaction between the structures;

[0027] (2) According to the nano monomer molecular scattering enhancement mode determined in step (1), the metal micro-nano structure parameters corresponding to the molecular scattering enhancement mode are preset, and the characteristic size is 50nm, a sphere of gold material with a period of 800nm structure, using the discrete dipole approximation (DDA) electromagnetic field calculation method, t...

Embodiment 2

[0032] In this embodiment, the dimer structure on the glass substrate is used to realize Raman scattering enhancement, and the detection object is a solid molecule. The specific steps are as follows:

[0033] (1) Since the detection object is a solid molecule, it is determined to use a nanodimer structure to achieve Raman scattering enhancement. The dimer structure needs to consider the interaction between particles, and the field strength will be greatly amplified at the shortest distance between the particles. Set the Raman enhancement factor EF1 to 1×107;

[0034] (2) Preset the parameters of the metal micro-nano structure, such as Figure 3a The spherical structure shown, the material of the metal micro-nano structure is silver, the size of a single particle is 50nm, and the period is 150nm. Using the discrete dipole approximation (DDA) electromagnetic field calculation method, the Raman enhancement factor of the simulated metal micro-nano structure is initially calculate...

Embodiment 3

[0039] In this embodiment, an array metal micro-nano structure is used to realize Raman scattering enhancement, and the detection object is a liquid molecule. The specific steps are as follows:

[0040] (1) According to the detection object is a liquid molecule, the group effect of the interaction between the arrays is selected to realize the detection of molecular scattering enhancement, and the Raman enhancement factor EF1 is set to 1×109;

[0041] (2) Preset the parameters of the metal micro-nano structure, such as Figure 4aAs shown, the cross-section of the structure is triangular, the arrangement is rectangular, and the characteristic size of the nanostructure is 30nm; using the discrete dipole approximation (DDA) electromagnetic field calculation method, the Raman enhancement factor EF2 of the simulated metal micro-nano structure is initially calculated to be 2 ×108;

[0042] (3) Raman scattering is enhanced by changing the arrangement and feature size of the nanostruc...

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Abstract

The present invention relates to an enhancement method for raman scattering by using an artificial metal micro-nanostructure. According to the character of the detected object and the interaction based on the difference between the nanostructure and the detected molecular, the scattering enhancement of the detected molecular is achieved by the use of independent enhancement output of the nano-monomer structure or the use of group effect of the interaction between the nano-double polymers or between the arrays. The method comprises the following steps: (1) setting a raman enhancement factor EF1 according to a determinate object, establishing a molecular scattering enhancement mode for use; (2) presetting a metal micro-nano structure parameter corresponding to the molecular scattering enhancement mode of the step (1), calculating to simulate a raman enhancement factor EF2 of the preset metal nano-monomer structure; (3) confirming the metal nano-monomer structure parameter if EF2 is more than or equal to EF1, if EF2 is less than or equal to EF1, repeating the step (2) until EF2 is more than or equal to EF1, and finally confirming the metal micro-nano structure parameter; and (4) realizing the fabrication of the metal micro-nano structure array by the method of microfabrication.

Description

technical field [0001] The invention belongs to the field of micro-nano technology, and relates to a method for realizing enhanced Raman scattering of molecules to be measured, in particular to a method for realizing enhanced Raman scattering of molecules to be measured by using artificial metal micro-nano structures. 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 (RS) is known as the fingerprint of molecules. The spectrum is characterized by narrow band and rich information. It is applied to sensing technology, which has high specificity, no sample preparation, and can provide fast, repeatable, Advantages of non-destructive qualitative and qu...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82B3/00B81C1/00
CPCG01N21/658
Inventor 邓启凌杜春雷罗先刚杨兰英史立芳尹韶云
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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