• Chinese Optics Letters
  • Vol. 19, Issue 9, 091201 (2021)
Xianbin Wang1, Hongchang Deng2、*, and Libo Yuan2
Author Affiliations
  • 1Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
  • 2Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China
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    Abstract

    The distributed optical fiber surface plasmon resonance (SPR) sensors have attracted wide attention in biosensing and chemical sensing applications. However, due to the limitation of their sensing structure, it is difficult to adjust their resonant wavelength and sensitivity. Here, novel and flexible cascaded helical-core fiber (HCF) SPR sensors are proposed theoretically and experimentally for distributed sensing applications. It is shown that the resonant wavelength and sensitivity of the sensors can be conveniently controlled by adjusting the twist pitch of the helical core. A high sensitivity of 11,180 nm/RIU for refractive-index measurement ranging from 1.355 to 1.365 is realized experimentally when the twist pitch of the helical core is 1.5 mm. It is worth noting that the sensitivity can be further improved by reducing the twist pitch. For example, the sensitivity of the sensor with a twist pitch of 1.4 mm can theoretically exceed 20,000 nm/RIU. This work opens up a new way to implement multi-parameter or distributed measurement, especially to establish sensing networks integrated in a single-core fiber or a multi-core fiber.
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    Xianbin Wang, Hongchang Deng, Libo Yuan. High sensitivity cascaded helical-core fiber SPR sensors[J]. Chinese Optics Letters, 2021, 19(9): 091201
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    Category: Instrumentation, Measurement, and Optical Sensing
    Received: Dec. 14, 2020
    Accepted: Feb. 26, 2021
    Posted: Mar. 1, 2021
    Published Online: Jul. 8, 2021
    The Author Email: Hongchang Deng (hcdeng@guet.edu.cn)