Mode parity-controlled fano- and lorentz-like line shapes arising in plasmonic nanorods

Niels Verellen*, Fernando López-Tejeira, Ramón Paniagua-Domínguez, Dries Vercruysse, Denitza Denkova, Liesbet Lagae, Pol Van Dorpe, Victor V. Moshchalkov, José A. Sánchez-Gil

*Corresponding author for this work

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

We present the experimental observation of spectral lines of distinctly different shapes in the optical extinction cross-section of metallic nanorod antennas under near-normal plane wave illumination. Surface plasmon resonances of odd mode parity present Fano interference in the scattering cross-section, resulting in asymmetric spectral lines. Contrarily, modes with even parity appear as symmetric Lorentzian lines. Finite element simulations are used to verify the experimental results. The emergence of either constructive or destructive mode interference is explained with a semianalytical 1D line current model. This simple model directly explains the mode-parity dependence of the Fano-like interference. Plasmonic nanorods are widely used as half-wave optical dipole antennas. Our findings offer a perspective and theoretical framework for operating these antennas at higher-order modes.

Original languageEnglish
Pages (from-to)2322-2329
Number of pages8
JournalNano Letters
Volume14
Issue number5
DOIs
Publication statusPublished - 14 May 2014
Externally publishedYes

Keywords

  • Fano resonance
  • interference
  • Nanoantenna
  • plasmonics
  • surface plasmon resonance

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