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Optical Trapping of Nanoparticles
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Non-linear bistability in pulsed optical traps.

Alex J Vernon1, Francisco J Rodríguez-Fotuño1, Anatoly V Zayats1

  • 1Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London, WC2R 2LS, UK.

Nanophotonics (Berlin, Germany)
|November 17, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new optical force model for pulsed optical traps, accounting for particle history to explain hysteresis and bistability. This advances nanoparticle manipulation and optical trap design in pulsed laser fields.

Keywords:
non-linear opticsoptical bistabilityoptical forceoptical trapping

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Optical trapping uses focused laser beams for micro/nanoparticle manipulation.
  • Non-linear effects in pulsed optical traps cause unusual opto-mechanical behaviors.
  • Existing models neglect feedback between particle permittivity and internal fields, missing hysteresis.

Purpose of the Study:

  • To develop a theoretical model for optical forces in pulsed optical traps that includes particle trajectory history.
  • To investigate optical bistability and hysteresis effects in pulsed optical traps.
  • To provide a formalism for designing advanced optical traps and nanoparticle manipulation techniques.

Main Methods:

  • Investigated a bistable optical trap using counter-propagating ultrashort pulses.
  • Developed a theoretical formalism for optical force considering particle trajectory.
  • Analyzed the feedback loop between particle permittivity and internal field strength.

Main Results:

  • The new model explains hysteresis effects and optical bistability in pulsed optical traps.
  • Optical force depends on the particle's historic trajectory, not just its current location.
  • Demonstrated a novel mechanism for nanoparticle manipulation in pulsed fields.

Conclusions:

  • The developed formalism accurately models non-linear optical forces in pulsed traps.
  • This research is crucial for designing advanced optical traps and nanoparticle manipulation.
  • Potential applications include time crystal demonstrations and enhanced nanotechnological processes.