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Related Experiment Video

Updated: Jun 23, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

Compressing surface plasmons for nano-scale optical focusing.

Hyeunseok Choi1, David F Pile, Sunghyun Nam

  • 1NSF Nano-scale Science and Engineering Center, University of California, Berkeley, CA 94720, USA.

Optics Express
|April 29, 2009
PubMed
Summary

Researchers achieved deep subwavelength light focusing, or nanofocusing, using surface plasmon polaritons in tapered V-grooves. This method concentrates light to approximately lambda/40 with high power efficiency, overcoming the diffraction limit.

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Area of Science:

  • Optics and Photonics
  • Plasmonics
  • Nanotechnology

Background:

  • Conventional optics face limitations in concentrating light below the diffraction limit.
  • Guiding optical beams smaller than the wavelength is restricted by diffraction.
  • Surface plasmon polaritons (SPPs) offer a route to overcome these limitations.

Purpose of the Study:

  • To experimentally demonstrate and quantify nanofocusing of SPPs.
  • To achieve light concentration beyond the diffraction limit.
  • To explore the use of tapered metallic V-grooves for SPP manipulation.

Main Methods:

  • Utilizing tapered metallic V-grooves to guide and confine SPPs.
  • Exploiting the wavelength scalability of SPPs for compression.
  • Quantitative measurement of the focused light spot size and power efficiency.

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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Last Updated: Jun 23, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Main Results:

  • Demonstrated nanofocusing of SPPs down to the deep subwavelength scale (approx. lambda/40).
  • Achieved nearly 50% power efficiency in the nanofocusing process.
  • Validated the compression of optical energy to nanometer dimensions.

Conclusions:

  • Tapered metallic V-grooves are effective structures for achieving deep subwavelength light concentration.
  • Nanofocusing using SPPs provides a viable mechanism for overcoming the diffraction limit in optics.
  • This technique has potential applications in nanoscale optical manipulation and imaging.