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Controllable Microparticle Spinning via Light without Spin Angular Momentum.

Yi-Jing Wu1, Pan-Pan Yu1, Yi-Fan Liu1

  • 1Department of Optics and Optical Engineering, <a href="https://ror.org/04c4dkn09">University of Science and Technology of China</a>, Hefei 230026, China.

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Summary
This summary is machine-generated.

Light without spin angular momentum (SAM) can spin microparticles. This study uses a focused vortex beam and the orbital Hall effect to control this spinning motion through light-matter interactions.

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Area of Science:

  • Optics and Photonics
  • Microparticle Manipulation
  • Light-Matter Interactions

Background:

  • Spin angular momentum (SAM) in polarized light can induce spinning motion in matter.
  • It is counterintuitive that light lacking SAM can also drive microparticle rotation.

Purpose of the Study:

  • To demonstrate controllable spinning of birefringent microparticles using a focused light beam without intrinsic SAM.
  • To investigate the role of the orbital Hall effect in controlling spin-transfer dynamics.

Main Methods:

  • Utilizing a tightly focused radially polarized vortex beam.
  • Applying the orbital Hall effect to manage spin component separation in the focal field.
  • Manipulating the source light's wavefront to tune SAM transfer.

Main Results:

  • Achieved controllable spinning of birefringent microparticles with a SAM-free focused beam.
  • Demonstrated tunable transfer of local SAM to microparticles.
  • Showcased the orbital Hall effect's role in enabling this phenomenon.

Conclusions:

  • Broadened perspectives for controlling optical torques.
  • Highlighted the potential of spin-orbit interactions in microparticle manipulation.
  • Opened new avenues for light-driven micro-rotational mechanics.