Photon crystal optical-fiber probe sensor based on nano grain surface increasing Raman spectrum

Abstract

Present invention discloses photons crystal optical fiber probe transducer based on nano particle surface enhancing Raman spectra belonging to laser Raman spectra detection technique. Combining photons crystal optical fiber PCF and SERS spectral technique to obtain PCF-SERS probe transducer having SERS activity, PCF-SERS probe covered with cycle arranged airport, the inner wall of central light guiding air core on PCF-SERS probe end having SERS activity nano metal granule. Said invention can be used in gas and liquid molecule detection with low background noise and high sensitivity, and making exciting light and SERS signal light existing steady mode field in PCF to realize very transmission loss, thereby suitable for on line analysis, real-time analysis, living body analysis, and in situ detecting etc.

Description

technical field [0001] The invention belongs to the technical field of laser Raman spectrum detection, in particular to a photonic crystal fiber probe sensor based on nanoparticle surface-enhanced Raman spectrum. Background technique [0002] Optical fiber Raman probes that combine Raman spectroscopy technology with optical fiber sensing technology have developed single-fiber, multi-fiber and other probe designs. The single-fiber (incident fiber is also used as the collection fiber) probe is relatively simple in structure, and the theoretical collection efficiency is high, but the Raman background generated when the excitation light is transmitted in the fiber is strong, resulting in a greatly reduced efficiency. Multi-fiber probes generally use one fiber to transmit the incident excitation light, and the rest of the fibers collect Raman scattered light. It has high efficiency, but requires precise alignment and alignment of the fibers, and the process is complex and costly....

AI Technical Summary

Problems solved by technology

The single-fiber (incident fiber is also used as the collection fiber) probe is relatively simple in structure, and the theoretical collection efficiency is very high, but the Raman background generated when the excitation light is transmitted in the fiber is strong, resulting in a greatly reduced efficiency

Multi-fiber probes generally use one fiber to transmit the incident excitation light, and the rest of the fibers collect Raman scattered light. It has high efficiency, but requires precise alignment and alignment of the fibers, and the process is complex and costly.

[0003] The intensity of Raman scattering spectrum is weak, which limits its application as a molecular detection method to a certain extent

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