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Surface-enhanced optical spectrum underlay of unsymmetrical double-split ring

A surface-enhanced spectroscopy, asymmetric technology, applied in the field of surface spectroscopy, can solve the problems of poor reproducibility of surface-enhanced spectroscopy, poor controllability of nanoparticles, etc., and achieves narrow crack width, high stability and reproducibility, and high electromagnetic field enhancement. effect of effect

Inactive Publication Date: 2010-03-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the controllability of the shape, size and particle distance of the nanoparticles of the surface-enhanced Raman scattering substrate prepared by these methods is poor, resulting in poor reproducibility of surface-enhanced spectroscopy, which restricts the practical and industrial application of surface-enhanced spectroscopy technology. Fundamental bottleneck [R.J.C.Brown et al., Nanostructures and nanostructured substrates for surface-enhanced Raman scattering (SERS), J.Raman Spectrosc.39(2008) 1313-1326; H.Ko et al., Nanostructured Surfaces and Assemblies as SERS Media, Small 4 (2008) 1576-1599].

Method used

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  • Surface-enhanced optical spectrum underlay of unsymmetrical double-split ring
  • Surface-enhanced optical spectrum underlay of unsymmetrical double-split ring
  • Surface-enhanced optical spectrum underlay of unsymmetrical double-split ring

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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, referring to the document [K.Li et al., Surface enhanced Raman scattering onlong-range ordered noble-metal nanocrescent arrays, Nanotechnology 19 (2008) 145305 / 7] disclosed nanoimprint lithography (nanoimprint lithography), the A metal (gold) ring is split into two sections of metal arcs with different arc lengths, as an asymmetrical double-split ring structural unit 2, and then the structural unit 2 is placed on the plane of the substrate glass 1 along two-dimensional two-axis (X-axis, Y-axis) are all arranged in a period of P=320nm to form a two-dimensional array, wherein the structural parameters of the asymmetric double-split ring structure unit 2 are: ring outer diameter R=90nm, ring width and thickness t=30nm, A metal arc with a shorter arc length corresponds to a central angle of θ=100°, a metal arc with a longer arc length corresponds to a central angle of 260° (360°-θ), and the gap width between the two arcs is equal, and the gap widt...

Embodiment 2

[0033] The extinction performance and electric field enhancement effect of gold asymmetric double-split ring surface-enhanced spectroscopy substrates:

[0034] For the structure and parameter definitions of asymmetric double-split ring arrays, see figure 1 , fixed period P, ring outer diameter R, ring width and thickness t, and slit width w (P=320nm, R=90nm, t=30nm, w=15nm), change the positions of the two slits at the same time or set the parameter θ at an interval of 20° Varying from 180° to 40° can result in double-split ring array structures with different asymmetries. The extinction spectra of gold double-cleaved ring array structures with different asymmetry such as figure 2 As shown: the asymmetric double-split ring array structure has two strong extinction peaks in the infrared and visible light bands, corresponding to the first-order (I) and second-order (II) plasmon resonances, and the structure of the symmetrical ring (w=0 ) and the symmetrical double-split ring ...

Embodiment 3

[0040] Extinction properties and electric field enhancement effects of silver asymmetric double-split ring surface-enhanced spectroscopy substrates:

[0041] Four different structural parameters [(1) period P=320nm, ring width and thickness t=30nm, ring outer diameter R=90nm, slit width w=15nm, angle θ=120°; (2) P=320nm, t= 30nm, R=90nm, w=15nm, θ=80°; (3) P=320nm, t=30nm, R=90nm, w=10nm, θ=80°; (4) P=320nm, t=30nm, R = 70nm, w = 15nm, θ = 80°] The extinction spectrum of the silver asymmetric double-split ring surface enhancement spectrum substrate is as follows Figure 6As shown: the silver asymmetric double-split ring periodic structure has dual-wavelength resonance performance similar to the gold asymmetric double-split ring periodic structure, and the resonance wavelength can be adjusted by structural parameters, such as when θ = 120° to θ = 80° When the radius R changes from 90nm to 70nm, the resonance peak (I) can be adjusted from 1.369μm to 1.498μm, and the resonance p...

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Abstract

The invention concretely discloses a surface-enhanced optical spectrum underlay of an unsymmetrical double-split ring, belonging to the technical field of surface optical spectrum. The underlay consists of a substrate and unsymmetrical double-split ring structural units which are periodically arranged on the substrate to form a two-dimensional array on the substrate. The unsymmetrical double-splitring structural unit is a metal split ring formed by two metal arcs with different lengths. The underlay of the invention has simple structure, large electromagnetic enhanced effect, good stability and reproducibility. Two strong extinction peaks in a near infrared region and an optical frequency, respectively correspond to a first-order resonance (I) and a second-order resonance (II); the electric filed enhanced effect can be further improved by reducing the width of the slit and optimizing a top structure; the wavelength range of the first phase resonance (I) and the second phase resonance(II) can be adjusted through structure parameters, so that the wavelength range of the surface-enhanced optical spectrum application can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of surface spectroscopy, in particular to an asymmetric double split ring surface enhanced spectrum substrate. Background technique [0002] Raman spectroscopy is a powerful tool for qualitative and quantitative analysis of molecular structure, mixture components and material performance research. It has important and extensive applications in monitoring and other fields. However, the traditional Raman scattering signal is very weak, which limits its application, especially for the detection of surface-adsorbed molecules. In 1974, Fleschmann in the United Kingdom found that strong Raman scattering of adsorbed pyridine molecules could be obtained on the surface of a rough silver electrode, and believed that this was caused by the increase in the surface area of ​​the rough surface, which increased the number of adsorbed molecules. In 1977, Van Duyne and Creighton in the United States independently obtained ...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82B1/00
Inventor 梁二军丁佩胡伟琴
Owner ZHENGZHOU UNIV
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