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Area of Science:

  • Optics
  • Photonics
  • Optical Tweezers

Background:

  • Focused light beams carry both spin angular momentum (SAM) and orbital angular momentum (OAM).
  • The spin-orbit interaction (SOI) in such beams influences the behavior of trapped microparticles.
  • Understanding SOI is crucial for advanced optical manipulation techniques.

Purpose of the Study:

  • To investigate the observable effects of spin-orbit interaction on a dielectric microsphere trapped in a tightly focused light beam.
  • To explore how beam parameters (width, polarization, vorticity) influence microsphere dynamics.
  • To validate theoretical models with experimental observations of optical forces.

Main Methods:

  • Trapping a single dielectric microsphere in a focused light beam with controlled SAM and OAM.
  • Modulating beam width, polarization, and vorticity to vary the strength of SOI.
  • Measuring the microsphere's orbit radius and orbiting frequency.
  • Employing the Richard and Wolf model for non-paraxial beam focusing.
  • Utilizing generalized Lorenz-Mie theory for optical force calculations.

Main Results:

  • Demonstrated observable effects of SOI on microsphere dynamics, including orbit radius and frequency.
  • Established a correlation between beam parameters and particle motion.
  • Achieved excellent agreement between experimental data and theoretical predictions based on non-paraxial vortex beam models.
  • Identified particle orbit radius as a key parameter for characterizing spin-to-orbital momentum conversion.

Conclusions:

  • Spin-orbit interaction in focused light beams provides a tunable mechanism to control microparticle dynamics.
  • The particle orbit radius is a robust indicator of spin-to-orbital momentum conversion, unaffected by trapping beam power.
  • This work validates advanced optical models and offers insights for precise optical manipulation.