All-Fiber Online Raman Sensor with Enhancement via Fabry-Perot Cavity

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All-Fiber Online Raman Sensor with Enhancement via Fabry-Perot Cavity
All-Fiber Online Raman Sensor with Enhancement via Fabry-Perot Cavity
Journal Title:
Optics Letters
Publication Date:
01 September 2020
In this paper, a novel all-fiber online Raman sensor with significant signal enhancement via Fabry-Perot (FP) cavity is proposed and demonstrated. The FP cavity structure is formed by inserting a long-pass coated fiber and a gold-plated capillary into a silver-lined capillary with a gap. A corroded single mode fiber is inserted into the gold-plated capillary to guide the excitation light into the FP cavity. The multiple reflections of excitation light in the FP cavity have significantly increased the interaction volume between the light and the sample. Experiment results have demonstrated an enhancement factor of 5 times in the detected Raman signal for ethanol compared to that is measured using the silver-lined hollow-core fiber based Raman cell without FP cavity, or 86 times compared with direct detection using bare fiber tip. The measurement results are in good agreements with theoretical analyses. This Raman sensor with signal enhancement via FP cavity has the potential to realize rapid sample replacement and online detection with high sensitivity and high accuracy for biochemical applications.
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Funding Info:
This work was sponsored by National Natural Science Foundation of China (nos. 61875083, 61535005), and Social Development Project of Jiangsu Province (BE2019761).
Publication source: © 2020 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

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