INVESTIGATION OF FANO RESONANCES INDUCED BY HIGHER ORDER PLASMON MODES ON A CIRCULAR NANO-DISK WITH AN ELONGATED CAVITY

In this paper, a planar metallic nanostructure design, which supports two distinct Fano resonances in its extinction cross-section spectrum under normally incident and linearly polarized electromagnetic field, is proposed. The proposed design involves a circular disk embedding an elongated cavity; s...

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Bibliographic Details
Published inElectromagnetic waves (Cambridge, Mass.) Vol. 130; pp. 187 - 206
Main Authors Amin, M, Bagci, H
Format Journal Article
LanguageEnglish
Published Electromagnetics Academy 01.08.2012
Subjects
Electromagnetism
Engineering research
Investigations
Polarization (Electricity)
Surface plasmon resonance
Saudi Arabia
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Summary:In this paper, a planar metallic nanostructure design, which supports two distinct Fano resonances in its extinction cross-section 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.
ISSN:1559-8985
1070-4698
1559-8985
DOI:10.2528/PIER12040507