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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Fano plasmonics goes nonlinear.

Maxim Sukharev1, Elena Drobnyh2, Ruth Pachter3

  • 1College of Integrative Sciences and Arts, Arizona State University, Mesa, Arizona 85212, USA.

The Journal of Chemical Physics
|October 8, 2022
PubMed
Summary
This summary is machine-generated.

Plasmonic nano-antennas enhance second harmonic generation through Fano-like resonances. An antisymmetric mode significantly boosts the second harmonic efficiency, confirmed by numerical simulations and an analytical model.

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Area of Science:

  • Nonlinear optics
  • Plasmonics
  • Nanophotonics

Background:

  • Plasmonic nano-antennas offer unique light-matter interactions.
  • Fano-like resonances in nanostructures can lead to enhanced optical nonlinearities.

Purpose of the Study:

  • Investigate second harmonic generation (SHG) in plasmonic nano-antennas with Fano-like resonances.
  • Explore the role of antisymmetric modes in enhancing SHG efficiency.

Main Methods:

  • Employed a rigorous fully vectorial Maxwell-hydrodynamics approach for numerical simulations.
  • Calculated second-order susceptibilities as a function of pump frequency.
  • Developed a simple analytical model using two coupled nonlinear oscillators.

Main Results:

  • Demonstrated a noticeable enhancement of SHG efficiency due to the antisymmetric mode in nanodolmen arrays.
  • Numerical simulations confirmed the significant impact of the antisymmetric mode.
  • The analytical model supported the numerical findings, showing enhanced second-order optical response at the antisymmetric normal mode frequency.

Conclusions:

  • Antisymmetric modes in plasmonic nano-antennas are crucial for enhancing second harmonic generation.
  • The proposed analytical model provides a simplified understanding of the observed nonlinear optical phenomena.
  • This research contributes to the development of efficient nonlinear optical devices based on plasmonic nanostructures.