Third Harmonic Mechanism in Complex Plasmonic Fano Structures | Zendy

Bernd Metzger | Zendy; Thorsten Schumacher | Zendy; Mario Hentschel | Zendy; Markus Lippitz | Zendy; Harald Gießen | Zendy

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Third Harmonic Mechanism in Complex Plasmonic Fano Structures

Author(s) -

Bernd Metzger,

Thorsten Schumacher,

Mario Hentschel,

Markus Lippitz,

Harald Gießen

Publication year - 2014

Publication title -

acs photonics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.735

H-Index - 89

ISSN - 2330-4022

DOI - 10.1021/ph5000677

Subject(s) - plasmon , fano resonance , anharmonicity , polarization (electrochemistry) , physics , fano plane , harmonic oscillator , spectroscopy , condensed matter physics , molecular physics , optics , quantum mechanics , chemistry , mathematics , pure mathematics

We perform third harmonic spectroscopy of dolmen-type nanostructures, which exhibit plasmonic Fano resonances in the near-infrared. Strong third harmonic emission is predominantly radiated close to the low energy peak of the Fano resonance. Furthermore, we find that the third harmonic polarization of the subradiant mode interferes destructively and diminishes the nonlinear signal in the far-field. By comparing the experimental third harmonic spectra with finite element simulations and an anharmonic oscillator model, we find strong indications that the source of the third harmonic is the optical nonlinearity of the bare gold enhanced by the resonant plasmonic polarization.

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