Surface-enhanced Raman scattering optical fiber probe

Abstract

The invention relates to a surface-enhanced Raman scattering optical fiber probe, comprising an optical fiber which can be simultaneously used for transmitting exciting light and receiving Raman scattering spectrum, a tapered optical fiber and one quartz microballoon, wherein the tapered optical fiber is formed on one end of the optical fiber, and then one quartz microballoon is thermally welded on the tip of the tapered optical fiber; when the exciting light passes through the tapered optical fiber and the quartz microballoon, evanescent waves transmitted by the tapered optical fiber and thequartz microballoon can excite the Raman spectrum of a solution or a gas molecule to be tested; meanwhile, metal nano particles are coated on the optical fiber and the surface of the quartz microballoon, so that the Raman scattering strength can be enhanced. In addition, a sensing structure of the combination of the tapered optical fiber and the quartz microballoon also has the functions of reflecting, focusing and collecting the surface-enhanced Raman scattering spectrum. The optical fiber probe is combined with a monochromatic source and a high-sensitivity Raman spectrometer so that a Ramandetection sensing device can be formed. The invention has simple structure, strong capacity of resisting disturbance and high sensitivity, thereby being suitable for information acquisition and transmission of on-line analysis occasions, real-time detection occasions, live sample analysis occasions, trace hazardous and noxious substance measurement occasions and the like.

Description

technical field [0001] The invention relates to a surface-enhanced Raman scattering optical fiber probe, which belongs to the technical field of optical fibers and sensors. Background technique [0002] In recent years, food safety is facing great challenges and people's health is threatened, so the detection of low-concentration trace substances has become a research hotspot. Compared with other spectra, Raman spectroscopy can provide rich molecular structure and molecular vibration information, so it has become a powerful tool for material analysis and material identification. But in the process of practical application, since the Raman scattering cross section is 10 -30 The order of magnitude is only one thousandth of Rayleigh scattering, and it is easily overwhelmed by the fluorescent background, thus limiting its application in various fields. If metals with different forms of roughening are used as substrates, the Raman scattering intensity can be increased by 10 5 ...

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