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Title: Graphene–bimetal plasmonic platform for ultra-sensitive biosensing
Authors: Tong, Jinguang
Jiang, Li
Chen, Huifang
Wang, Yiqin
Yong, Ken-Tye
Forsberg, Erik
He, Sailing
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Tong, J., Jiang, L., Chen, H., Wang, Y., Yong, K.-T., Forsberg, E., & He, S. (2018). Graphene–bimetal plasmonic platform for ultra-sensitive biosensing. Optics Communications, 410, 817-823. doi:10.1016/j.optcom.2017.11.039
Journal: Optics Communications
Abstract: A graphene–bimetal plasmonic platform for surface plasmon resonance biosensing with ultra-high sensitivity was proposed and optimized. In this hybrid configuration, graphene nanosheets was employed to effectively absorb the excitation light and serve as biomolecular recognition elements for increased adsorption of analytes. Coating of an additional Au film prevents oxidation of the Ag substrate during manufacturing process and enhances the sensitivity at the same time. Thus, a bimetal Au–Ag substrate enables improved sensing performance and promotes stability of this plasmonic sensor. In this work we optimized the number of graphene layers as well as the thickness of the Au film and the Ag substrate based on the phase-interrogation sensitivity. We found an optimized configuration consisting of 6 layers of graphene coated on a bimetal surface consisting of a 5 nm Au film and a 30 nm Ag film. The calculation results showed the configuration could achieve a phase sensitivity as high as 1.71×106 deg/RIU, which was more than 2 orders of magnitude higher than that of bimetal structure and graphene–silver structure. Due to this enhanced sensing performance, the graphene–bimetal plasmonic platform proposed in this paper is potential for ultra-sensitive plasmonic sensing.
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2017.11.039
Rights: © 2017 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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