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Article

A Bimetallic-Coated, Low Propagation Loss, Photonic Crystal Fiber Based Plasmonic Refractive Index Sensor

1
Department of Electrical and Electronic Engineering, Independent University Bangladesh (IUB), Dhaka 1229, Bangladesh
2
Department of Electrical and Electronic Engineering, Green University of Bangladesh, Dhaka 1207, Bangladesh
3
School of Electronics and Telecommunication, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
4
Faculty of Engineering, University of the Ryukyus, Nishihara 151-0066, Japan
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(17), 3794; https://doi.org/10.3390/s19173794
Received: 25 July 2019 / Revised: 27 August 2019 / Accepted: 30 August 2019 / Published: 1 September 2019
(This article belongs to the Special Issue Optical Fiber Biosensors)
In this paper, a low-loss, spiral lattice photonic crystal fiber (PCF)-based plasmonic biosensor is proposed for its application in detecting various biomolecules (i.e., sugar, protein, DNA, and mRNA) and biochemicals (i.e., serum and urine). Plasmonic material gold (Au) is employed externally to efficiently generate surface plasmon resonance (SPR) in the outer surface of the PCF. A thin layer of titanium oxide (TiO2) is also introduced, which assists in adhering the Au layer to the silica fiber. The sensing performance is investigated using a mode solver based on the finite element method (FEM). Simulation results show a maximum wavelength sensitivity of 23,000 nm/RIU for a bio-samples refractive index (RI) detection range of 1.32–1.40. This sensor also exhibits a very low confinement loss of 0.22 and 2.87 dB/cm for the analyte at 1.32 and 1.40 RI, respectively. Because of the ultra-low propagation loss, the proposed sensor can be fabricated within several centimeters, which reduces the complexity related to splicing, and so on. View Full-Text
Keywords: photonic crystal fiber (PCF); confinement loss; wavelength sensitivity; plasmonic sensor; refractive index (RI) photonic crystal fiber (PCF); confinement loss; wavelength sensitivity; plasmonic sensor; refractive index (RI)
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MDPI and ACS Style

Mahfuz, M.A.; Hossain, M.A.; Haque, E.; Hai, N.H.; Namihira, Y.; Ahmed, F. A Bimetallic-Coated, Low Propagation Loss, Photonic Crystal Fiber Based Plasmonic Refractive Index Sensor. Sensors 2019, 19, 3794. https://doi.org/10.3390/s19173794

AMA Style

Mahfuz MA, Hossain MA, Haque E, Hai NH, Namihira Y, Ahmed F. A Bimetallic-Coated, Low Propagation Loss, Photonic Crystal Fiber Based Plasmonic Refractive Index Sensor. Sensors. 2019; 19(17):3794. https://doi.org/10.3390/s19173794

Chicago/Turabian Style

Mahfuz, Mohammad A., Md. A. Hossain, Emranul Haque, Nguyen H. Hai, Yoshinori Namihira, and Feroz Ahmed. 2019. "A Bimetallic-Coated, Low Propagation Loss, Photonic Crystal Fiber Based Plasmonic Refractive Index Sensor" Sensors 19, no. 17: 3794. https://doi.org/10.3390/s19173794

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