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Open AccessConcept Paper

Sensitivity Comparison of Refractive Index Transducer Optical Fiber Based on Surface Plasmon Resonance Using Ag, Cu, and Bimetallic Ag–Cu Layer

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Photonics Research Centre, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
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Department of Computer and Information Science (DCIS), Faculty of Science and Information Technology (FSIT), Universiti Teknologi Petronas (UTP), Seri Iskandar 32610, Malaysia
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Department of Information and Communication Technology, Mawlana Bhashani Science and Technology University, Santosh, Tangail 1902, Bangladesh
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Group of Bio-Photomatix, Mawlana Bhashani Science and Technology University, Santosh, Tangail 1902, Bangladesh
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Computational Optics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
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Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 77; https://doi.org/10.3390/mi11010077
Received: 15 September 2019 / Revised: 3 November 2019 / Accepted: 14 November 2019 / Published: 10 January 2020
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. View Full-Text
Keywords: D-shaped optical fiber; bimetallic layer; SPR; alcohol sensor D-shaped optical fiber; bimetallic layer; SPR; alcohol sensor
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MDPI and ACS Style

Zakaria, R.; Zainuddin, N.A.M.; Raya, S.A.; Alwi, S.A.K.; Anwar, T.; Sarlan, A.; Ahmed, K.; Amiri, I.S. Sensitivity Comparison of Refractive Index Transducer Optical Fiber Based on Surface Plasmon Resonance Using Ag, Cu, and Bimetallic Ag–Cu Layer. Micromachines 2020, 11, 77.

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