Raman spectrum based optical waveguide sensor

Abstract

The invention discloses a Raman spectrum based optical waveguide sensor. The Raman spectrum based optical waveguide sensor comprises an input waveguide, a spiral sensing waveguide, a filter, a connecting waveguide and an output waveguide, wherein a detection window is formed in an upper cladding layer of the spiral sensing waveguide, the input end of the spiral sensing waveguide is connected with a wavelength tunable laser by the input waveguide, the output end of the spiral sensing waveguide is connected with one side of the filter by the connecting waveguide, and the other side of the filter is connected with an optical power meter by the output waveguide. The Raman spectrum based optical waveguide sensor can qualitatively analyze a single sample or a gas-liquid mixed sample, utilizes the planar optical waveguide as a Raman spectrum excitation and collection medium, and is integrated with the filter to obtain a small, low-cost and untagged sensor.

Description

technical field [0001] The invention is an optical waveguide sensor and relates to an optical waveguide sensor based on Raman spectrum. Background technique [0002] As an important field of information science, optical sensing technology has very important applications in environmental monitoring, pharmaceutical research and development, food safety and other fields. Optical waveguide sensors have the advantages of high sensitivity, anti-electromagnetic interference, easy integration, and real-time monitoring, and have been rapidly developed and widely used. [0003] The basic principle of the optical waveguide sensor device is that part of the light propagating in the optical waveguide is transmitted in the cladding of the optical waveguide in the form of evanescent waves. When the measured object is in contact with the optical fiber or the core layer of the planar waveguide, it will interact with the evanescent wave. , so as to change the characteristics of the light tra...

AI Technical Summary

Problems solved by technology

These photosensors have a common problem, which requires complex surface functionalization to achieve their specificity, that is, they cannot perform qualitative analysis on the measured sample, and sensors based on Raman spectroscopy can effectively solve this problem

However, due to the very weak Raman scattered light (accounting for about 10% of the total scattered light -8 ), to detect the Raman spectrum, the strong Rayleigh scattered light must be filtered out, so traditional Raman spectrometers have complex filters (mostly multi-level gratings) for filtering, so the equipment is bulky and expensive expensive

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