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Related Experiment Video

Updated: May 25, 2026

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
09:12

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Nanoplasmonics: classical down to the nanometer scale.

Huigao Duan1, Antonio I Fernández-Domínguez, Michel Bosman

  • 1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602.

Nano Letters
|February 9, 2012
PubMed
Summary

Researchers explored sub-nanometer gold nanostructures, finding classical electrodynamics still applies. Plasmon modes evolved gradually, showing quantum effects emerge at even smaller scales.

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Area of Science:

  • Nanophotonics
  • Quantum Plasmonics
  • Materials Science

Background:

  • Classical electrodynamics is widely used to describe plasmonic effects in metallic nanostructures.
  • Quantum effects are anticipated to become significant at sub-nanometer length scales due to electron behavior in metals.

Purpose of the Study:

  • To investigate plasmonic effects in gold nanostructures fabricated at the sub-nanometer scale.
  • To evaluate the validity of classical electrodynamics at these small dimensions.
  • To observe the evolution of plasmon modes as nanostructures approach each other.

Main Methods:

  • Fabrication of gold nanostructures with sub-nanometer gaps (down to 0.5 nm).
  • Electron energy-loss spectroscopy (EELS) for probing plasmon resonances.

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Last Updated: May 25, 2026

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
09:12

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
07:20

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
09:13

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Published on: April 4, 2017

  • Transmission electron microscope (TEM) imaging for structural analysis.

    • Main Results:

    • Experimental results show good agreement with classical electromagnetic calculations and LC circuit models.
    • Classical electrodynamics remains valid for describing plasmonic effects down to the nanometer scale investigated.
    • Gradual evolution of plasmon modes, including the onset of charge-transfer plasmon and transformation of dipolar bright mode.

    Conclusions:

    • Classical electrodynamics is applicable for plasmonic phenomena in gold nanostructures down to 0.5 nm gaps.
    • A full quantum mechanical description may be necessary only for gaps of a few angstroms.
    • The study reveals the continuous evolution of plasmon modes, bridging classical and quantum regimes.