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Collective Effects in Second-Harmonic Generation from Plasmonic Oligomers.

Godofredo Bautista1, Christoph Dreser2,3, Xiaorun Zang1

  • 1Laboratory of Photonics , Tampere University of Technology , Korkeakoulunkatu 3 , 33720 Tampere , Finland.

Nano Letters
|March 28, 2018
PubMed
Summary

We studied plasmonic oligomers using advanced microscopy. Different nanorod arrangements showed unique light interactions, with azimuthal orientations silencing second-harmonic generation (SHG).

Keywords:
Cylindrical vector beamsboundary element methodelectron beam lithographyplasmonic oligomerssecond-harmonic generation microscopy

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Nonlinear Optics

Background:

  • Collective effects in plasmonic nanostructures are crucial for controlling light-matter interactions.
  • Second-harmonic generation (SHG) is a sensitive probe of nanoscale optical properties.

Purpose of the Study:

  • To investigate collective effects in plasmonic oligomers of varying symmetries.
  • To understand how polarization of incident light and interparticle coupling influence SHG.
  • To explore tailoring nonlinear optical responses in nano-object arrangements.

Main Methods:

  • Utilized second-harmonic generation (SHG) microscopy with cylindrical vector beams (CVBs).
  • Employed oligomers of gold nanorods with specific resonance properties.
  • Performed numerical calculations using the boundary element method (BEM).

Main Results:

  • SHG from rotationally symmetric oligomers is significantly affected by CVB polarization and interparticle coupling.
  • Oligomers with radially oriented nanorods showed minimal coupling effects.
  • Oligomers with azimuthally oriented nanorods exhibited strong coupling, leading to the silencing of SHG.

Conclusions:

  • The interplay between CVB polarization and interparticle coupling dictates SHG response in plasmonic oligomers.
  • Azimuthal arrangement of nanorods can effectively suppress SHG.
  • This work presents a novel approach for studying coupling effects and tuning nonlinear optical phenomena in complex nanostructures.