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24 January 2019 High sensitivity plasmonic sensor using hybrid structure of graphene stripe combined with gold gap-ring
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Abstract
To reduce the plasmonic line width of the metallic nano-structures and improve its performance when used in sensing, a hybrid structure consisting of a graphene stripe and a gold gap-ring is proposed and studied numerically. The structure works at Middle-IR band(3-6μm). Through strong coupling, some narrow dips caused by absorption of graphene appear on the wide background scattering spectrum of the metallic structure. Due to the high plasmonic confinement of graphene, the line width of these dips is around several tens nano-meters. In addition, the resonance intensity of graphene is enhanced significantly. By index changing, the sensing property of this composite structure is also studied. Simulation results show that its sensitivity exceeds 3000 nm/RIU (refractive index unit) and the figure of merit can reach up to 109 which prove our structure a good sensor.
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Zhiyuan Du, Bin Hu, and Juan Liu "High sensitivity plasmonic sensor using hybrid structure of graphene stripe combined with gold gap-ring ", Proc. SPIE 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 108400D (24 January 2019); https://doi.org/10.1117/12.2506841
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