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  • Received: Apr. 27, 2019

    Accepted: Jun. 14, 2019

    Posted: Sep. 6, 2019

    Published Online: Sep. 6, 2019

    The Author Email: Guanghui Wang (wangguanghui@nju.edu.cn)

    DOI: 10.3788/COL201917.110601

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    Hao Cai, Xingtao Yu, Qian Chu, Zhiqiang Jin, Bo Lin, Guanghui Wang. Hollow-core fiber-based Raman probe extension kit for in situ and sensitive ultramicro-analysis[J]. Chinese Optics Letters, 2019, 17(11): 110601

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Chinese Optics Letters, Vol. 17, Issue 11, 110601 (2019)

Hollow-core fiber-based Raman probe extension kit for in situ and sensitive ultramicro-analysis

Hao Cai1, Xingtao Yu1, Qian Chu1, Zhiqiang Jin1, Bo Lin2, and Guanghui Wang1,*

Author Affiliations

  • 1College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
  • 2China Academy of Electronics and Information Technology, Beijing 100041, China

Abstract

A metal-lined hollow-core fiber-based Raman probe extension kit is proposed in this Letter for in situ and sensitive ultramicro-analysis. A hollow-core fiber can confine light and fluid samples in its hollow core, with enhanced light–sample interaction. By using a homemade light coupling device with a glass window for liquid isolation, a 3.5-cm-long hollow-core fiber could mount on and connect to a Raman probe, with perfect light coupling efficiency. After full filling the hollow-core fiber chamber with a volume of 13 μL by using a syringe pump, it can act as an extension kit for an ordinary Raman probe and be used as a ultramicro-analysis tool for the sample of microfluidic chips. In order to enhance its sensitivity, a gold film coated fiber tip is inserted into the capillary, which can double the Raman signal received by reflecting pump light and Raman light. Finally, a detection limit of 5% for ethanol solution and an enhancement factor of two compared with direct detection of bulk sample volume are demonstrated. Above all, our device can be utilized as a Raman probe extension kit, which is suitable for rapid, sensitive, and in situ measurements for a few microliter level samples.