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Symmetry-selective third-harmonic generation from plasmonic metacrystals.

Shumei Chen1, Guixin Li1, Franziska Zeuner2

  • 1School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom and Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong.

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Area of Science:

  • Nonlinear optics
  • Plasmonics
  • Nanophotonics

Background:

  • Nonlinear optical processes are governed by symmetry selection rules.
  • Centrosymmetry breaking is key for even harmonic generation.
  • Rotational symmetry rules are known for circular polarization states in crystals.

Purpose of the Study:

  • To demonstrate rotational symmetry-dependent third harmonic generation (THG) in nonlinear plasmonic metacrystals.
  • To show that metacrystal rotational symmetry can impose selection rules for THG.
  • To explore symmetry-based design of nonlinear optical responses.

Main Methods:

  • Fabrication of nonlinear plasmonic metacrystals.
  • Embedding metacrystals in an isotropic nonlinear organic thin film.
  • Experimental investigation of third harmonic generation (THG).

Main Results:

  • Third harmonic generation (THG) was observed to be dependent on the rotational symmetry of the plasmonic metacrystals.
  • A selection rule for THG was successfully imposed by the metacrystal's rotational symmetry.
  • The nonlinear optical response was tunable via the engineered symmetry.

Conclusions:

  • Rotational symmetry of plasmonic metacrystals can dictate nonlinear optical selection rules.
  • This provides a new pathway for designing tailored symmetry-dependent nonlinear optical responses.
  • The findings are applicable to the development of advanced plasmonic nanostructures.