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| Progress In Electromagnetics Research | ISSN: 1070-4698, E-ISSN: 1559-8985 |
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INVESTIGATION OF FANO RESONANCES INDUCED BY HIGHER ORDER PLASMON MODES ON A CIRCULAR NANO-DISK WITH AN ELONGATED CAVITYBy M. Amin and H. BagciAbstract: In this paper, a planar metallic nanostructure design, which supports two distinct Fano resonances in its extinction crosssection spectrum under normally incident and linearly polarized electromagnetic field, is proposed. The proposed design involves a circular disk embedding an elongated cavity; shifting and rotating the cavity break the symmetry of the structure with respect to the incident field and induce higher order plasmon modes. As a result, Fano resonances are generated in the visible spectrum due to the destructive interference between the sub-radiant higher order modes and super-radiant the dipolar mode. The Fano resonances can be tuned by varying the cavity's width and the rotation angle. An RLC circuit, which is mathematically equivalent to a mass-spring oscillator, is proposed to model the optical response of the nanostructure design.
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