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Researchers achieved controlled rotation of nanoparticles at the deep subwavelength scale using nonlinear optical effects. This breakthrough enables manipulation of nano-objects with the smallest orbital radius to date, opening new avenues for nanomachines and biotechnology.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Biophysics

Background:

  • Optical manipulation of nano-objects is crucial for applications in nanomachines and biotechnology.
  • The diffraction limit traditionally hinders precise rotation of nanoparticles at the subwavelength scale.

Purpose of the Study:

  • To develop a method for controlled, fast orbital rotation (circumgyration) of nanoparticles at deep subwavelength scales.
  • To overcome the limitations imposed by the diffraction limit in optical trapping and manipulation.

Main Methods:

  • Utilizing nonlinear optical effects instead of sub-diffraction focusing for nanoparticle rotation.
  • Experimentally demonstrating the rotation of metallic nanoparticles using a femtosecond pulsed Gaussian beam.

Main Results:

  • Achieved controlled orbital rotation of metallic nanoparticles with an orbital radius of 71 nm, the smallest reported to date.
  • Demonstrated circumgyration frequencies exceeding 1 kHz in water.
  • Successfully employed a femtosecond pulsed Gaussian beam, deviating from the use of vortex beams.

Conclusions:

  • The proposed method enables nanoparticle manipulation beyond the diffraction limit.
  • This research provides a new paradigm for optically driven nanomachines and nanoscale applications.
  • The findings are expected to stimulate further research in nano-rheology, micro-fluid mechanics, and nanoscale biological applications.