Optical waveguide enhancement mechanism method and Raman spectrometer
A Raman spectroscopy and waveguide technology, which is applied in the field of Raman spectroscopy enhancement of biological samples, can solve problems such as small refractive index, and achieve the effect of increasing the interaction distance and increasing the intensity of Raman spectroscopy signals.
Active Publication Date: 2016-06-01
启东市德聚邻信息科技有限公司
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However, the LCOF method requires that the refractive index of the liquid sample must be greater than that of the optical fiber cladding, and the refractive index of most liquids is smaller than that of the conventional optical fiber cladding, which has great limitations in practical applications.
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[0028] Below by accompanying drawing and embodiment the present invention is described in further detail, figure 1 It is a kind of optical waveguide Raman spectrometer, which is equipped with an upper metal film (2), an upper glass (3), a sample cell (4), a lower metal film (5), and a lower glass (7) from top to bottom, wherein the upper metal The film (2) and the lower metal film (5) form the cladding layer of the waveguide, the upper glass (3) and the sample cell (4) form the waveguide layer, and the side metal film (6) is close to the above upper metal film (2), The upper glass (3), the sample cell (4), the lower metal film (5), the lower glass (7), the top of the side metal film (6) is flush with the top of the upper metal film (2), and the bottom of the side metal film (6) The end is flush with the bottom of the lower metal film (5), and the laser is used as the light source (1). After the light source (1) is incident on the upper metal film (2), it is scattered by the sa...
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Abstract
The invention relates to a design concept of Raman spectrum of an optical waveguide enhancement mechanism, and the design concept of the Raman spectrum of the optical waveguide enhancement mechanism is used for identifying substance and qualitatively and quantitatively analyzing property of the substance. A Raman spectrometer consists of a metal film, thick glasses, a sample cell and a metal film, and is capable of directly coupling a laser in a wavelength of 785 nm into a waveguide layer between two metal layers to generate an ultrahigh-order guide mode so as to enhance Raman scattering, wherein the ultrahigh-order guide mode has an ultrahigh light intensity and is irrelevant with polarization. The enhancement is different from surface plasma enhancement, and metal nanometer sol is unnecessary to be added; and the enhancement is also different from a resonance Raman effect and liquid core fiber Raman enhancement, and has no requirement on wavelength of an incident light and refractive index of a sample.
Description
technical field [0001] The invention relates to a new method for Raman spectrum enhancement, in particular to a new method for realizing Raman spectrum enhancement of biological samples by using a millimeter-scale double-sided metal-clad waveguide combined with free space coupling technology. Background technique [0002] Raman spectroscopy belongs to molecular vibration spectroscopy, which can be used to identify substances, qualitatively and quantitatively analyze the properties of substances, and has a wide range of uses. However, the Raman spectrum signal is very weak, generally only 10 of the incident light intensity. -6 ~10 -10 . At present, there are three main methods for enhancing Raman spectroscopy: the first is surface-enhanced Raman scattering (SERS), which uses the electromagnetic enhancement caused by localized plasmon excitation on the metal surface to enhance the Raman scattering of the measured object. effect, enhancement factor up to 10 6 , or even high...
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IPC IPC(8): G01N21/65
Inventor 许田方靖淮金永龙王超男袁莉袁国秋
Owner 启东市德聚邻信息科技有限公司