4.7 Article

On-Demand Fabrication of Optical Microfiber Couplers With Precisely Controlled Dispersion Turning Points: Towards Sensing Application in Liquids

期刊

JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 2, 页码 667-673

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3033660

关键词

Couplers; Etching; Optical fiber sensors; Optical fiber couplers; Optical coupling; Optical device fabrication; Dispersion turning point; optical microfiber coupler; ultrasensitive sensor

资金

  1. National Natural Science Foundation of China [61974143, 61727813, 61805241]
  2. Youth Innovation Promotion Association CAS [2020223]
  3. Jilin Industrial Technology Research and Development Project [2019C035-2]

向作者/读者索取更多资源

This study presents a two-step fabrication method for OMCs with precisely controlled DTPs, showing that the DTP can be accurately tuned in both water and high refractive index liquid media by controlling the reaction time. Experimental results demonstrate that OMCs fabricated using this method can serve as ultrasensitive RI sensors and biosensors for CEA.
In this article, we demonstrate an on-demand two-step fabrication strategy for optical microfiber couplers (OMCs) with precisely controlled dispersion turning points (DTPs). Firstly, an OMC with a relatively thick width is obtained through the fusion elongation method. Secondly, the as-fabricated OMC is placed in a low-concentration hydrofluoric acid solution whose refractive index (RI) is adjusted to match that of the target working environment to fine etch the width of the OMC. During the etching process, the real-time output spectrum of the OMC is monitored in-line to track the position of the OMC. The etching process is terminated once the desired DTP appears. Our study shows that by accurately controlling the reaction time, the DTP can be tuned from 1600 to 900 nm with high precision better than 1 nm in both water and a liquid medium with a high RI of 1.365. Finally, we experimentally demonstrate that the OMC fabricated by the proposed method can work as an ultrasensitive RI sensor with a sensitivity of -1.61x105 +/- 0.15x105 nm/RIU at 1.333 and a biosensor for carcinoembryonic antigen (CEA) with a limit of detection of 2 pg/mL.

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