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All optical dynamic nanomanipulation with active colloidal tweezers.

Souvik Ghosh1, Ambarish Ghosh2,3

  • 1Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India.

Nature Communications
|September 15, 2019
PubMed
Summary

Researchers developed novel hybrid plasmonic nanodisks on microrods for advanced optical nanomanipulation. These colloidal tweezers enable precise control over nanoscale cargo, even in ionic solutions, at low laser powers.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Colloidal Science

Background:

  • Traditional optical tweezers are limited by the diffraction limit.
  • Plasmonic tweezers offer higher trapping efficiency but have fixed nanostructures.
  • Existing methods face limitations in speed and versatility for nanoscale manipulation.

Purpose of the Study:

  • To develop a novel hybrid structure for advanced optical nanomanipulation.
  • To overcome the limitations of traditional and fixed plasmonic tweezers.
  • To enable high-efficiency trapping and controlled manipulation of nanoscale colloids.

Main Methods:

  • Fabrication of plasmonic nanodisks over dielectric microrods.
  • Utilizing conventional optical tweezers to maneuver hybrid structures.
  • Generating confined optical near-fields for trapping nanoparticles as small as 40 nm.

Main Results:

  • Hybrid structures function as mobile near-field traps.
  • Successful transport of nanoscale cargo in ionic solutions at low optical intensities.
  • Demonstrated parallel and independent manipulation of diverse colloids (fluorescent nanodiamonds, magnetic nanoparticles).

Conclusions:

  • The hybrid plasmonic nanodisk-microrod structures offer a versatile platform for optical nanomanipulation.
  • This approach allows for low-power, high-efficiency trapping and controlled manipulation of various nanoscale objects.
  • The developed colloidal tweezers show potential for applications in fields requiring precise nanoscale control.