Journal
ACS PHOTONICS
Volume 1, Issue 6, Pages 471-476Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph5000677
Keywords
nano optics; plasmonics; nonlinear optics; spectroscopy; third harmonic generation; Fano resonance
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Funding
- Baden-Wurttemberg Stiftung (Kompetenznetz Funktionelle Nanostrukturen)
- DFG [SPP1391]
- BMBF [13N10146]
- ERC (Complexplas)
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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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