Optimizing LSPR-based optical fibre refractive index sensor based on solid and hollow gold nanospheres

Gorbov, Ivan; Korposh, Serhiy; Lapchuk, Anatoliy; Lee, Seung-Woo; Erdody, Sandor

Abstract

In this work, we systematically study the difference between the detection of absorption and reflection signals at the varying refractive index (RI) values for gold nanospheres deposited on the tip of an optical fibre sensor. Localised surface plasmon resonance (LSPR) peak shifts for absorption and reflection were studied both using simulation and experiment at various interparticle distances to estimate fibre sensor sensitivity. For experimental validation, Au nanoparticles (Au-NPs) were deposited using layer-by-layer deposition method with the aid of poly (allylamine hydrochloride) (PAH) and 3-Aminopropyltriethoxysilane (APTES). Samples prepared with APTES showed more efficient adsorption of the Au-NPs onto the tip of optical fibre. It was shown that detection of reflective signal could provide a sensitivity of about 220 nm/RUI. The effect of hollow Au nanoshell structures was also simulated, and it was demonstrated that sensitivity can increase to 300 – 340 nm/RUI.

Citation

Gorbov, I., Korposh, S., Lapchuk, A., Lee, S.-W., & Erdody, S. (2025). Optimizing LSPR-based optical fibre refractive index sensor based on solid and hollow gold nanospheres. Sensors and Actuators A: Physical, 388, Article 116473. https://doi.org/10.1016/j.sna.2025.116473

• Journal Article Type: Article
• Acceptance Date: Mar 14, 2025
• Online Publication Date: Mar 16, 2025
• Publication Date: 2025-07
• Deposit Date: Mar 24, 2025
• Journal: Sensors and Actuators A: Physical
• Print ISSN: 0924-4247
• Electronic ISSN: 1873-3069
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 388
• Article Number: 116473
• DOI: https://doi.org/10.1016/j.sna.2025.116473
• Keywords: LSPR, Optical fibre sensors, Refractive index, Reflection spectra, Gold nanoparticles
• Public URL: https://nottingham-repository.worktribe.com/output/46994872
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0924424725002791?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Optimizing LSPR-based optical fibre refractive index sensor based on solid and hollow gold nanospheres; Journal Title: Sensors and Actuators A: Physical; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.sna.2025.116473; Content Type: article; Copyright: © 2025 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.