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Related Experiment Video

Updated: Aug 8, 2025

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Plasmonic Nonlinear Energy Transfer Enhanced Second Harmonic Generation Nanoscopy.

Yoonsoo Rho1,2, SeokJae Yoo3, Daniel B Durham4,5

  • 1Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States.

Nano Letters
|February 27, 2023
PubMed
Summary

We developed a novel nanoscopy technique using a plasmonic nanotip for enhanced second harmonic generation (SHG) imaging. This method achieves high contrast for nanoscale material analysis, revealing quantum mechanical effects.

Keywords:
Near-field opticsNonlinear opticsSecond harmonic generation (SHG)Zinc oxide nanowire

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Last Updated: Aug 8, 2025

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Area of Science:

  • Nonlinear optics
  • Plasmonics
  • Nanotechnology

Background:

  • Nonlinear optical response reveals material properties but is limited by weak signals and far-field optics.
  • Probing deep-subwavelength-scale nonlinear optics requires overcoming signal-to-noise ratio limitations.

Purpose of the Study:

  • To propose an efficient second harmonic generation (SHG) nanoscopy technique for SHG-active samples.
  • To utilize an SHG-active plasmonic nanotip for enhanced nonlinear optical measurements.
  • To demonstrate nanoscale resolution imaging of physicochemical phenomena.

Main Methods:

  • Full-wave simulation of SHG nanoscopy using an SHG-active plasmonic nanotip and a zinc oxide nanowire (ZnO NW) sample.
  • Investigating conditions for high near-field SHG contrast by manipulating the nonlinear response of the tip and sample.
  • Analyzing nanoscale corrosion of ZnO NW.

Main Results:

  • Simulations indicate high near-field SHG contrast is achievable by enhancing the ZnO NW nonlinear response or suppressing the tip's nonlinear response.
  • Observed high contrast suggests quantum mechanical nonlinear energy transfer between the tip and sample, modifying optical susceptibility.
  • Demonstrated nanoscale resolution imaging of ZnO NW corrosion.

Conclusions:

  • The proposed SHG nanoscopy technique offers efficient imaging of subwavelength nonlinear optical properties.
  • The findings suggest quantum mechanical interactions play a role in tip-sample nonlinear optical processes.
  • This approach has potential for nanoscale characterization of various physicochemical phenomena.