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Sensitivity comparison of refractive index transducer optical fiber based on surface plasmon resonance using Ag, Cu, and bimetallic Ag-Cu layer

Zakaria, R. and Zainuddin, N.A.M. and Raya, S.A. and Alwi, S.A.K. and Anwar, T. and Sarlan, A. and Ahmed, K. and Amiri, I.S. (2020) Sensitivity comparison of refractive index transducer optical fiber based on surface plasmon resonance using Ag, Cu, and bimetallic Ag-Cu layer. Micromachines, 11 (1).

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

A single-mode optical fiber sensor uses surface plasmon resonance (SPR) with a bimetallic silver-copper (Ag-Cu) coating compared to a single layer of Ag and Cu itself. Bimetallic Ag-Cu sensors are constructed by simple fabrication on a side-polished optical fiber, followed by an electron beam evaporation of Ag and Cu films. For this investigation, the thickness of the single Ag layer was set to 30 nm and the single Cu layer was set to 30 nm; whereas for the bimetallic combined Ag-Cu layer the thickness of Ag was 7 nm and Cu 23 nm. The sensor performance was analyzed and compared experimentally and numerically using the COMSOL Multiphysics. A white light source was used with a broad optical bandwidth to provide a range of wavelengths to the optical fiber. The characteristics of the thin layers of Ag, Cu, and Ag-Cu as alcohol sensors were evaluated. We found that Cu was the most sensitive metallic layer compared to the Ag and the bimetallic Ag-Cu layers. For a 100 alcohol concentration, Cu showed a sensitivity of 425 nm/RIU followed by the bimetallic Ag-Cu layer with 108.33 nm/RIU, whereas the Ag layer was not detected. Interestingly, sensitivity reached saturation beyond the 20 nm thick layer of Ag. This shows that the Cu and the bimetallic Ag-Cu layers are suitable for an alcohol-based optical sensor. © 2020 by the authors.

Item Type:Article
Impact Factor:cited By 4
Uncontrolled Keywords:Binary alloys; Light sources; Optical fibers; Plasmons; Refractive index; Silver; Surface plasmon resonance, Alcohol concentrations; Alcohol sensor; Bimetallic layers; D-shaped optical fibers; Electron beam evaporation; Side-polished optical fiber; Single-mode optical fiber sensors; White light sources, Optical fiber fabrication
ID Code:23352
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 07:24
Last Modified:19 Aug 2021 07:24

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