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

AuthorsVerellen, Niels; López-Tejeira, F. ; Paniagua-Domínguez, R. ; Vercruysse, D.; Denkova, D.; Lagae, L.; Van Dorpe, P.; Moshchalkov, V.V.; Sánchez-Gil, José A.
Issue Date2014
PublisherAmerican Chemical Society
CitationNano Letters 14: 2322- 2329 (2014)
AbstractWe 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. © 2014 American Chemical Society.
Identifiersdoi: 10.1021/nl404670x
issn: 1530-6992
Appears in Collections:(CFMAC-IEM) Artículos
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