Open AccessLSPR optical fiber sensor based on 3D gold nanoparticles with monolayer graphene as a spacer
Author(s) -
Jingwen Feng,
Jinjuan Gao,
Wen Yang,
Runcheng Liu,
Muhammad Shafi,
Zhipeng Zha,
Cong Liu,
Shicai Xu,
Tingyin Ning,
Shouzhen Jiang
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.453806
Subject(s) - materials science , surface plasmon resonance , refractive index , graphene , plasmon , optoelectronics , biosensor , colloidal gold , surface plasmon , monolayer , fiber optic sensor , optical fiber , nanoparticle , nanotechnology , fiber , optics , composite material , physics
Localized surface plasmon resonance (LSPR) optical fiber biosensing is an advanced and powerful label-free technique which gets great attention for its high sensitivity to refractive index change in surroundings. However, the pursuit of a higher sensitivity is still challenging and should be further investigated. In this paper, based on a monolayer graphene/gold nanoparticles (Gr m /Au NPs) three-dimensional (3D) hybrid structure, we fabricated a D-shaped plastic optical fiber (D-POF) LSPR sensor using a facile two-step method. The coupling enhancement of the resonance of this multilayer structure was extremely excited by the surface plasmon property of the stacked Au NPs/Gr m layer. We found that the number of plasmonic structure layers was of high importance to the performance of the sensor. Moreover, the optimal electromagnetic field enhancement effect was found in three-layer plasmonic structure. Besides, the n*(Gr m /Au NPs)/D-POF sensor exhibited outstanding performance in sensitivity (2160 nm/RIU), linearity (linear fitting coefficient R 2 = 0.996) and reproducibility. Moreover, the sensor successfully detected the concentration of glucose, achieving a sensitivity of 1317.61 nm/RIU, which suggested a promising prospect for the application in medicine and biotechnology.