Investigation of Fano resonances induced by higher order plasmon modes on a circular nano-disk with an elongated cavity

Muhammad Amin, Hakan Bagci

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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.
Original languageEnglish (US)
Pages (from-to)187-206
Number of pages20
JournalProgress in Electromagnetics Research
Volume130
DOIs
StatePublished - Jan 13 2014

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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