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Optical Trapping of Nanoparticles
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Helicity and Polarization Gradient Optical Trapping in Evanescent Fields.

Jinsheng Lu1, Vincent Ginis1,2, Soon Wei Daniel Lim1

  • 1Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA.

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Researchers developed new optical trapping methods using nonconservative forces for achiral particles. This expands possibilities for optical manipulation and light-matter interaction studies in evanescent fields.

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Area of Science:

  • Optics and Photonics
  • Light-Matter Interactions
  • Nanotechnology

Background:

  • Conventional optical traps rely on conservative intensity-gradient forces, limiting their application.
  • Existing nonconservative optical traps are restricted to chiral particles and specific field gradients.
  • A need exists for versatile optical trapping methods applicable to a broader range of particles and fields.

Purpose of the Study:

  • To propose and demonstrate novel optical trapping techniques utilizing nonconservative forces.
  • To enable optical trapping of achiral particles in evanescent fields using helicity and polarization gradients.
  • To develop an optical switching system for manipulating microspheres around microfibers.

Main Methods:

  • Employing helicity and polarization gradients in optical fields.
  • Utilizing evanescent fields for particle trapping.
  • Designing an optical switching system for controlled microsphere manipulation.
  • Investigating light-matter interactions in polarization gradient fields.

Main Results:

  • Successful trapping and manipulation of achiral particles using proposed methods.
  • Demonstration of an optical switching system for precise microsphere movement.
  • Expansion of the parameter space for optical traps.
  • Enhanced understanding of light-matter interactions in polarization gradient fields.

Conclusions:

  • Helicity and polarization gradient optical trapping offer a versatile alternative to traditional methods.
  • The proposed techniques significantly broaden the scope of particles and fields compatible with optical trapping.
  • This work advances the fundamental understanding of light-matter interactions and optical manipulation capabilities.