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Type: Journal article
Title: Plasmonic refractive index sensor employing niobium nanofilm on photonic crystal fiber
Author: Hasan, M.R.
Akter, S.
Ahmed, K.
Abbott, D.
Citation: IEEE Photonics Technology Letters, 2018; 30(4):315-318
Publisher: IEEE
Issue Date: 2018
ISSN: 1041-1135
Statement of
Md. Rabiul Hasan, Sanjida Akter, Kawsar Ahmed and Derek Abbott
Abstract: This letter presents a numerical investigation of a highly sensitive refractive index sensor based on surface plasmon resonance. An ultrathin niobium nanofilm is proposed as a new plasmonic material, which outperforms existing plasmonic materials. This nanofilm is employed on a photonic crystal fiber for the first time resulting sensing over a wide range of refractive indices. Finite-element method-based numerical analysis shows that maximum amplitude sensitivity of 1560 RIU−1 and wavelength sensitivity of 8000 nm/RIU can be obtained for an analyte index of 1.40. A thin aluminum oxide (Al2O3) film is deposited on the outer layer of niobium film to enhance the coupling strength and in order to tune the resonance wavelength. Moreover, the effects of varying thickness of niobium nanofilm and Al2O3 film on sensing performance are also discussed. The proposed niobium nanofilm based sensor can be potentially implemented in biochemical and organic chemical sensing.
Keywords: Surface plasmon resonancep; niobium nanofilm; photonic crystal fiber; amplitude sensitivity
Rights: © 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
RMID: 0030080523
DOI: 10.1109/LPT.2017.2786475
Appears in Collections:Electrical and Electronic Engineering publications

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