Multi-channel surface-enhanced Raman scattering probe based on photonic crystal fiber

He Yan; Zhonghuan Zhang; Jie Liu; Mingshan Li; Songsong Liao; Changxi Yang; Lantian Hou

doi:10.1117/12.818244

27 April 2009 Multi-channel surface-enhanced Raman scattering probe based on photonic crystal fiber

He Yan, Zhonghuan Zhang, Jie Liu, Mingshan Li, Songsong Liao, Changxi Yang, Lantian Hou

Proceedings Volume 7316, Fiber Optic Sensors and Applications VI; 731619 (2009) https://doi.org/10.1117/12.818244
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

A multi-channel surface-enhanced Raman scattering (SERS) probe based on a multi-core photonic crystal fiber (PCF) is investigated. The multi-core fiber contains seven hollow core PCFs arranging in a compact hexagon pattern that one PCF is in the center with six other surrounded, and the total diameter including the protective jacket is less than 200μm. The seven PCFs can guide light respectively, providing seven channels for sensing. The excitation light is coupled into each core from one end (measuring-tip) of the fiber while the sample entrance is at the other end (probing-tip). Analyte solution mixed with the silver nanoparticles enters each core via the capillary effect, and the silver nanoparticles serve as the SERS substrate. The excitation light transmitting in each hollow core can interact directly with the analyte and the silver nanoparticles in the air cores along the fiber axis. The SERS signal scattered by the sample propagates through the fiber back to the measuring-tip; then couples out of the fiber into the Raman spectrometer. Comparing to a single core PCF SERS probe, the multi-core probe not only takes the advantages of high efficiency of light usage and large interaction space for SERS in each channel, but also is more robust and could provide multi-data. Basing on the seven data of the analyte from the seven channels, an accurate average result could be achieved with less instability. Different concentration Rhodamine 6G solutions have been used as test samples, and the multi-channel sensing idea has been demonstrated by the proof-of-concept experiments.

Citation Download Citation

He Yan, Zhonghuan Zhang, Jie Liu, Mingshan Li, Songsong Liao, Changxi Yang, and Lantian Hou "Multi-channel surface-enhanced Raman scattering probe based on photonic crystal fiber", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 731619 (27 April 2009); https://doi.org/10.1117/12.818244

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