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Microscopic metaspinners, made from nanostructured dielectric metasurfaces, use light to generate rotation and anomalous forces. These light-driven micro-rotors exhibit unique collective behavior when trapped together.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Microscopy

Background:

  • Nanostructured dielectric metasurfaces enable precise control over light-matter momentum exchange.
  • Light can exert forces and torques on matter, a phenomenon with significant technological potential.

Purpose of the Study:

  • To introduce microscopic metaspinners utilizing optical metasurfaces for light-induced rotation.
  • To investigate the forces and collective behaviors of these metaspinners in a liquid environment.

Main Methods:

  • Fabrication of ultracompact untethered microscopic metaspinners from nanostructured dielectric metasurfaces.
  • Illumination with weakly focused light to induce rotation via photon recoil and light bending.
  • Observation of collective dynamics of multiple metaspinners trapped in a laser beam.

Main Results:

  • Metaspinners efficiently generate torque and orbital angular momentum through light bending.
  • An anomalous transverse lateral optical gradient force acts on the metaspinners.
  • Trapped metaspinners exhibit collective orbiting behavior opposite to their spin direction.

Conclusions:

  • Optical metasurfaces are effective components for creating light-driven micro-rotors.
  • Metaspinners demonstrate novel optomechanical interactions and collective dynamics.
  • These devices offer potential for artificial active matter and micro-scale machinery.