Highly sensitive SPR refractive index sensor based on tapered capillary optical fiber

Xiaowen Jiang; Hongchang Deng; Shiliang Qu

doi:10.1117/12.3048735

5 December 2024 Highly sensitive SPR refractive index sensor based on tapered capillary optical fiber

Xiaowen Jiang, Hongchang Deng, Shiliang Qu

Proceedings Volume 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024); 134183I (2024) https://doi.org/10.1117/12.3048735
Event: 15th International Conference on Information Optics and Photonics (CIOP2024), 2024, Xi’an, China

Abstract

A novel SPR fiber-optic sensor for highly sensitive surrounding refractive index (SRI) detection is proposed and experimentally demonstrated. The sensor is composed of a graded-index multimode - tapered capillary - graded-index multimode optical fiber (GIF-TCOF-GIF) structure with a 50nm gold layer coated on one side of the sensitive section. For the sensor immersed in a liquid sample, the SPR valley shows up at a wavelength around 600 nm. Changes of surrounding refractive index led to a red shift of the SPR valley wavelength. Benefitting from the higher order modes excited by the tapered capillary propagating in the silica cladding, the proposed sensor achieves a higher refractive index sensitivity of 6729.4 nm/RIU at a RI of 1.4195, which beyond many other previous works with cascaded structures. Experimental results show that this proposed sensor also has the advantages of small size, ease of fabrication process, low temperature crosstalk and lower cost, which make it ideal for practical bio-sensing and chemical sensing applications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaowen Jiang, Hongchang Deng, and Shiliang Qu "Highly sensitive SPR refractive index sensor based on tapered capillary optical fiber", Proc. SPIE 13418, Fifteenth International Conference on Information Optics and Photonics (CIOP 2024), 134183I (5 December 2024); https://doi.org/10.1117/12.3048735

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