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Related Experiment Video

Updated: Jun 29, 2025

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Far-Field Petahertz Sampling of Plasmonic Fields.

Kai-Fu Wong1,2, Weiwei Li3,4, Zilong Wang3,4

  • 1The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.

Nano Letters
|March 26, 2024
PubMed
Summary

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We introduce a new method for directly sampling localized surface plasmons (LSPs) in the petahertz domain, enabling precise measurement of nanoscale fields in nanostructures for advanced optics applications.

Area of Science:

  • Plasmonics and Nanophotonics
  • Quantum Optics
  • Ultrafast Spectroscopy

Background:

  • Localized surface plasmons (LSPs) are crucial for nanoscale field confinement in metal nanostructures.
  • Terahertz-domain field sampling has enabled tracing of collective excitations.
  • Extending these capabilities to higher frequencies is essential for new applications.

Purpose of the Study:

  • To introduce a novel method for direct sampling of localized surface plasmons (LSPs) in the petahertz domain.
  • To enable subcycle precision measurement of LSP fields in arbitrary nanostructures.
  • To explore the dynamic behavior and control of plasmonic excitations.

Main Methods:

  • Direct sampling of LSPs in the petahertz domain using few-cycle pulses.
Keywords:
gold nanoparticlespetahertz field samplingplasmon dynamicsplasmonics

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  • Demonstration on colloidal nanoparticles.
  • Comparison with finite-difference time-domain (FDTD) calculations.

    • Main Results:

    • Successful measurement of LSP fields in colloidal nanoparticles with subcycle precision.
    • Resolution of plasmonic excitation build-up and dephasing.
    • Observation of spectral phase reshaping and demonstration of ad-hoc pulse shaping by tailoring plasmonic samples.

    Conclusions:

    • The developed petahertz-domain sampling method provides direct access to LSP dynamics.
    • This technique offers precise control over light-matter interactions at the nanoscale.
    • The methodology can be extended to single nanosystems for exploring attosecond phenomena.