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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Published on: January 3, 2016

Nanoparticle surface electromagnetic fields studied by single-particle nonlinear optical spectroscopy.

Manabendra Chandra1, Kenneth L Knappenberger

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.

Physical Chemistry Chemical Physics : PCCP
|December 13, 2012
PubMed
Summary
This summary is machine-generated.

Single-particle second harmonic generation (SHG) measurements reveal chiral electromagnetic fields between gold nanosphere dimers. This technique quantifies surface fields and demonstrates structure sensitivity for nonlinear optical responses.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Area of Science:

  • Plasmonics
  • Nonlinear Optics
  • Nanophotonics

Background:

  • Localized surface plasmon modes in metallic nanostructures generate enhanced electromagnetic fields.
  • Second harmonic generation (SHG) is a nonlinear optical process sensitive to local field enhancements and symmetry.
  • Single-particle measurements offer high spatial resolution for studying nanoscale optical phenomena.

Purpose of the Study:

  • To investigate the localized electromagnetic surface fields in solid gold nanosphere (SGN) dimers using polarization-resolved SHG.
  • To quantify the chirality of these surface fields and identify its origin.
  • To demonstrate the structure sensitivity of the continuous polarization variation SHG (CPV-SHG) method.

Main Methods:

  • Single-particle polarization-resolved second harmonic generation (SHG) measurements.
  • Continuous polarization variation SHG (CPV-SHG) experiments for quantitative analysis.
  • Scanning Electron Microscopy (SEM) for structural characterization.

Main Results:

  • Single-particle SHG measurements successfully quantified localized electromagnetic fields.
  • Chiral surface fields were observed between SGNs in several dimers.
  • CPV-SHG analysis confirmed magnetic-dipolar contributions as the source of chirality.
  • The CPV-SHG method demonstrated sensitivity to the nanostructure's geometry.

Conclusions:

  • Polarization-resolved SHG is a powerful tool for probing chiral electromagnetic fields at the nanoscale.
  • The observed chirality in SGN dimers arises from magnetic-dipolar nonlinear optical responses.
  • The CPV-SHG technique provides a structure-sensitive method for characterizing plasmonic nanostructures.