LSPR-based fibre optic sensor fabricated by laser annealing of thin gold films

Solaimany Nazar, HR; Koutsogeorgis, DC; Ying, C; Yang, J; Zhang, Q

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LSPR-based fibre optic sensor fabricated by laser annealing of thin gold films

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Solaimany Nazar, HR, Koutsogeorgis, DC ORCID: https://orcid.org/0000-0001-6167-1084, Ying, C ORCID: https://orcid.org/0000-0002-7279-1388, Yang, J and Zhang, Q ORCID: https://orcid.org/0000-0001-5811-8034, 2025. LSPR-based fibre optic sensor fabricated by laser annealing of thin gold films. SPIE - International Society for Optical Engineering. Proceedings, 13639: 1363965. ISSN 0277-786X

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Official URL: https://doi.org/10.1117/12.3061690

Abstract

A fibre optic sensor based on localized surface plasmon resonance (LSPR) is fabricated by transforming a thin gold film deposited on the sensor tip into gold nanoparticles (AuNPs) using the laser annealing technique. The reflected spectra of the sensor exhibit a strong LSPR peak between 600 and 650 nm. The sensor is capable of detecting refractive index (RI) changes within the tested range of 1.3 to 1.395. As the RI increases, clear wavelength shifts in the peak wavelength are observed. The sensor responds linearly to RI variations, achieving a sensitivity of -215.8 nm/RIU. SEM analysis confirms the successful formation of AuNPs, which are essential for the sensor’s high sensitivity and consistent performance. The fabricated sensor is cost-effective, easy to fabricate, and suitable for biochemical applications.

Item Type:	Journal article
Description:	Paper presented at 29th International Conference on Optical Fiber Sensors, Porto, Portugal, 25–30 May 2025
Publication Title:	SPIE - International Society for Optical Engineering. Proceedings
Creators:	Solaimany Nazar, H.R., Koutsogeorgis, D.C., Ying, C., Yang, J. and Zhang, Q.
Date:	22 May 2025
Volume:	13639
ISSN:	0277-786X
Identifiers:	Number Type 10.1117/12.3061690 DOI 2519172 Other
Rights:	Copyright 2025 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Divisions:	Schools > School of Science and Technology
Record created by:	Jeremy Silvester
Date Added:	19 Nov 2025 11:01
Last Modified:	19 Nov 2025 11:01
URI:	https://irep.ntu.ac.uk/id/eprint/54774