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Summary

We developed a nonlinear plasmonic metasurface with diode-like functionality. This device shows efficient second-harmonic generation in one direction and suppressed generation in the reverse, achieving a 10 dB extinction ratio.

Keywords:
bianisotropymetasrufacesnonlinear opticsplasmonicssecond-harmonic generation

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Area of Science:

  • Photonics and Metamaterials
  • Nonlinear Optics
  • Plasmonics

Background:

  • Metasurfaces offer unique optical properties.
  • Second-harmonic generation (SHG) is a key nonlinear optical process.
  • Achieving directional asymmetry in nonlinear responses is challenging.

Purpose of the Study:

  • To demonstrate a plasmonic metasurface with diode-like second-harmonic generation (SHG).
  • To investigate the role of material composition asymmetry in achieving directional nonlinear optical effects.
  • To explore the fundamental implications for reciprocity and time-reversal symmetry.

Main Methods:

  • Fabrication of a nonlinear plasmonic metasurface using aluminum and silver.
  • Experimental measurement of second-harmonic generation (SHG) under directional excitation.
  • Full-wave electromagnetic simulations to validate experimental findings.
  • Homogenization analysis to extract the effective susceptibility tensor.

Main Results:

  • Demonstrated strongly asymmetric second-harmonic generation (SHG) with a diode-like functionality.
  • Achieved a significant extinction ratio of approximately 10 dB for SHG between opposite excitation directions.
  • Confirmed the bianisotropic response of the metasurface due to material asymmetry.

Conclusions:

  • The developed metasurface effectively functions as an optical diode for SHG.
  • Material composition asymmetry is a viable strategy for creating directional nonlinear optical responses.
  • The findings provide insights into fundamental principles of reciprocity and time-reversal asymmetry in optical systems.