An ultra-sensitive and compact refractive index sensor based on intense cladding-modulation

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-07-10 DOI:10.1016/j.yofte.2025.104341

Jun Gao, Wenjie Yang, Xuanting Liu, Chunbo Su, Shengjia Wang, Tao Geng

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Abstract

This paper proposes an ultrasensitive and compact refractive index sensor based on an intensely cladding-modulation long-period fiber grating (ICM-LPFG), fabricated solely by periodic symmetric deep D-shaped grooves on both sides of a single-mode fiber using a CO₂ laser. The sensor demonstrates ultrahigh sensitivity up to 6358.96 nm/RIU within the refractive index range of 1.3858–1.4270, features a low temperature sensitivity of 50.92 pm/°C, possesses a minimal sensing length of merely 2.06 mm, and exhibits a low temperature cross-sensitivity of only 8.01 × 10^-6 RIU/℃. This sensor offers significant advantages in fabrication simplicity, structural compactness, and low-temperature cross-sensitivity. To our knowledge, it achieves ultrahigh sensitivity among reported all-fiber LPFG-based RI sensors requiring neither expensive equipment nor specialized processes. It demonstrates promising potential for applications in biochemical and environmental monitoring fields demanding miniaturization and cost-effective solutions under complex environmental conditions.

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一种基于强包层调制的超灵敏紧凑型折射率传感器

本文提出了一种基于强包层调制长周期光纤光栅（ICM-LPFG）的超灵敏紧凑型折射率传感器，该传感器仅在单模光纤两侧使用CO2激光器制作周期对称深d形沟槽。该传感器在1.3858 ~ 1.4270的折射率范围内具有高达6358.96 nm/RIU的超高灵敏度，低温灵敏度为50.92 pm/°C，最小传感长度仅为2.06 mm，低温交叉灵敏度仅为8.01 × 10-6 RIU/℃。该传感器在制造简单、结构紧凑和低温交叉灵敏度方面具有显著的优势。据我们所知，在所有基于lpfg的全光纤RI传感器中，它实现了超高的灵敏度，既不需要昂贵的设备，也不需要专门的工艺。在复杂环境条件下要求小型化和具有成本效益的解决方案的生化和环境监测领域中，它显示了巨大的应用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.