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Modal Symmetry Controlled Second-Harmonic Generation by Propagating Plasmons.

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  • 1Institute of Photonics Technologies , National Tsing Hua University , Hsinchu 30013 , Taiwan.

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|August 24, 2019
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Summary
This summary is machine-generated.

This study introduces a novel approach for second-harmonic generation (SHG) in optical nanocircuits. Symmetry alone enables SHG in centrosymmetric materials, offering new design possibilities for nanophotonic devices.

Keywords:
Surface plasmon polaritonsoptical nanocircuitpolarization-selective controlsecond-harmonic generationsurface nonlinear optics

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Area of Science:

  • Nonlinear Optics
  • Nanophotonics
  • Plasmonics

Background:

  • Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
  • Conventional SHG typically requires non-centrosymmetric materials.
  • Controlling SHG in centrosymmetric systems remains a challenge.

Purpose of the Study:

  • To propose and demonstrate a new concept for achieving SHG in optical nanocircuits.
  • To show that optical mode symmetry is sufficient for SHG, even in centrosymmetric structures.
  • To explore the use of plasmonic waveguides for tunable SHG.

Main Methods:

  • Theoretical modeling of optical mode symmetry and SHG.
  • Experimental realization using a plasmonic two-wire transmission-line (TWTL).
  • Excitation and analysis of symmetric and antisymmetric waveguide modes.

Main Results:

  • Demonstrated SHG is allowed by mode symmetry in centrosymmetric materials.
  • Confirmed SHG emission into the symmetric mode with symmetric or antisymmetric fundamental modes.
  • Achieved tunable SHG emission into the antisymmetric mode by exciting a mixture of fundamental modes.

Conclusions:

  • Optical mode symmetry provides a new degree of freedom for SHG control.
  • This approach enables SHG in previously restricted centrosymmetric materials.
  • Paves the way for multifunctional nanophotonic circuitry and nonlinear optical components.