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Raman spectrum enhancing device based on optical waveguide oscillating field sensor

A Raman spectroscopy and enhancement device technology, which is applied in the device field of the Raman spectroscopy technology field, can solve the problems such as difficulty in realizing real-time and dynamic online SERS detection, SERS substrate chips cannot be recycled, and the function of enhanced Raman spectroscopy is lost, and the like. To achieve the effect of broadening the scope of application, simple structure, and enhancing the intensity of Raman scattered light

Inactive Publication Date: 2014-05-28
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SERS also has its disadvantages. One is that SERS technology has high selectivity, that is, for different types of substances to be tested, the SERS substrate chips used are also different, and a clear pairing relationship between the two has not yet been established, which causes the use of SERS technology. There are certain difficulties
Secondly, the SERS substrate chip generally has a nanostructure, which is easily exposed to the air during use, and is damaged by environmental factors and loses its enhanced Raman spectroscopy function. Moreover, the SERS substrate chip cannot be recycled, and it is difficult to realize real-time and dynamic online SERS. detection

Method used

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  • Raman spectrum enhancing device based on optical waveguide oscillating field sensor
  • Raman spectrum enhancing device based on optical waveguide oscillating field sensor
  • Raman spectrum enhancing device based on optical waveguide oscillating field sensor

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Embodiment 1

[0026] Such as figure 1 As shown, the present invention is realized in this way, the lower layer glass layer 5, the intermediate layer glass layer 7 and the coupling prism 1 are closely attached and connected sequentially from bottom to top, and the bottom surface of the coupling prism 1 is connected with the metal film 2 on the bottom surface of the coupling prism, so The lower glass layer 5 is connected with the lower glass metal film 4 . The coupling prism 1 is one of a triangular prism or a cylindrical cylindrical mirror. The metal film 2 on the bottom surface of the coupling prism is one of a gold film, a silver film or a copper film, and the film thickness is 30-50 nm. There is a sample pool 8 at the center of the interlayer glass layer 7, and the shape of the sample pool is one of circle or square. A cylindrical slot is arranged between the center positions of the two side walls of the interlayer glass layer 7, and the cylindrical slot communicates with the sample poo...

Embodiment 2

[0033] The implementation mode of this embodiment is the same as that of Embodiment 1.

[0034] Figure 6 It is the enhanced Raman spectrogram of the present embodiment, and the sample to be tested used in the present embodiment is a urethane solution with a concentration of 60 , the incident laser wavelength is 650nm, and the power is 10mW. The lower figure is the unenhanced Raman spectrum, and the upper figure is the Raman spectrum enhanced by the device of the present invention. Comparing the upper and lower figures, the Raman enhancement factor of the device of the present invention in this embodiment is 16.

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Abstract

The invention relates to a Raman spectrum enhancing device based on an optical waveguide oscillating field sensor. A lower glass layer, a middle glass layer and a coupling prism are tightly attached and connected in sequence from the bottom to top; the bottom surface of the coupling prism is connected with a coupling prism bottom surface metal film; the lower glass layer is connected with a lower glass metal film. According to the Raman spectrum enhancing device, a sample is injected in a middle glass layer sample room as a guided wave layer of the optical waveguide oscillating field sensor, and incident light propagates in a Z-shaped path in the sample, so that the operating distance of the light and a substance to be detected is increased, the luminous power density is extremely high, and the Raman scattering light intensity of the sample can be greatly strengthened. A cylindrical groove of the middle glass layer realizes dynamic online Raman spectrum detection of the substance to be detected.

Description

technical field [0001] The invention relates to a device in the technical field of Raman spectroscopy, in particular to a Raman spectroscopy enhancement device based on an optical waveguide oscillating field sensor. Background technique [0002] Raman spectroscopy belongs to molecular vibration spectroscopy, which can be used to identify substances, qualitatively and quantitatively analyze substances, and has a wide range of uses. Raman spectroscopy technology has the characteristics of high efficiency, simplicity and greenness. It will not pollute the environment, and the analysis time is short and the cost is not high. It can realize the rapid and non-destructive detection of trace substances. However, the Raman spectrum signals of trace substances are very weak, generally only a fraction of the incident light intensity. , so it is necessary to enhance the Raman spectrum signal. In recent years, enhanced Raman spectroscopy, as a tool that can effectively detect the ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 吴至境施宇欧阳爱国
Owner EAST CHINA JIAOTONG UNIVERSITY