Nayak J.K.Jha R.2025-02-1720181http://dx.doi.org/10.1109/LPT.2018.2865491https://idr.iitbbs.ac.in/handle/2008/1705Graphene Oxide (GO) coated silver (Ag) island system based on localized surface plasmon resonance (LSPR) phenomenon have been developed using optical fiber as a sensing probe. The Ag-island is used to excite LSPR field which is responsible for the analyte sensing through a shift in resonance wavelength. The deposition of Ag-islands is confirmed from UV-VIS spectra and Field Emission Scanning Electron Micro-graph (FESEM). The usage of GO helps to protect Ag-island from oxidation along with opening a new window for bio-sensing due to its structural compatibility with the bio-sensing system. We have experientially observed that the GO as a dielectric overlayer on Ag-island shows a refractive index sensitivity of 2217.04 nm/RIU with a resolution of 4.05 � 10-4 RIU. � 2018 IEEE.enAg-islandFiber sensorgraphene oxideresolutionsensitivityArticle