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Third Harmonic Mechanism in Complex Plasmonic Fano Structures.

Bernd Metzger1, Thorsten Schumacher2, Mario Hentschel3

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70569 Stuttgart, Germany.

ACS Photonics
|December 26, 2014
PubMed
Summary
This summary is machine-generated.

We studied third harmonic generation in dolmen nanostructures, observing strong emission linked to plasmonic Fano resonances. Destructive interference from subradiant modes reduced the nonlinear signal, with gold

Keywords:
Fano resonancenano opticsnonlinear opticsplasmonicsspectroscopythird harmonic generation

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Area of Science:

  • Plasmonics and Nanophotonics
  • Nonlinear Optics

Background:

  • Dolmen-type nanostructures exhibit plasmonic Fano resonances in the near-infrared spectrum.
  • Fano resonances are crucial for understanding light-matter interactions at the nanoscale.

Purpose of the Study:

  • To investigate third harmonic generation (THG) in dolmen-type nanostructures.
  • To elucidate the relationship between Fano resonances and THG emission.
  • To identify the primary source of THG in these nanostructures.

Main Methods:

  • Experimental third harmonic spectroscopy was performed on dolmen nanostructures.
  • Finite element simulations were used to model the optical response.
  • An anharmonic oscillator model was employed to analyze the nonlinear behavior.

Main Results:

  • Strong THG emission was observed, predominantly near the low-energy peak of the plasmonic Fano resonance.
  • The third harmonic polarization of the subradiant mode caused destructive interference, diminishing the far-field nonlinear signal.
  • Experimental results align with simulations and theoretical models, indicating nonlinear optical properties of gold as the source.

Conclusions:

  • The optical nonlinearity of bare gold, enhanced by resonant plasmonic polarization, is the main source of third harmonic generation.
  • Plasmonic Fano resonances significantly influence and enhance nonlinear optical phenomena in nanostructures.
  • Understanding interference effects is key to controlling and optimizing nonlinear signals in plasmonic systems.