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Multiplexed vortex beam-based optical tweezers generated with spiral phase mask.

Francisco M Muñoz-Pérez1,2, Vicente Ferrando1, Walter D Furlan3

  • 1Centro de Tecnologías Físicas, Universitat Politècnica de València, 46022 València, Spain.

Iscience
|October 20, 2023
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Summary

Researchers developed a novel optical tweezers method using a multiplexed spiral phase mask to create multiple, independent vortex beams. This technique enables precise control over microparticle manipulation and angular momentum transfer.

Keywords:
Optical physicsOpticsPhysics

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Area of Science:

  • Optics and Photonics
  • Microscale Engineering
  • Soft Matter Physics

Background:

  • Optical tweezers are crucial for manipulating microparticles.
  • Generating multiple, independent optical vortices presents a significant challenge.
  • Controlling angular momentum transfer to trapped particles requires advanced optical elements.

Purpose of the Study:

  • To design and implement a multiplexed spiral phase mask for optical tweezers.
  • To generate multiple concentric vortex beams with independent topological charges.
  • To experimentally demonstrate controlled angular momentum transfer to microparticles.

Main Methods:

  • Design and fabrication of a diffractive optical element (DOE) - a multiplexed spiral phase mask.
  • Integration of the DOE into an experimental optical tweezers setup.
  • Characterization of generated vortex beams and their interaction with trapped microparticles.

Main Results:

  • Successful generation of multiple concentric vortex beams without amplitude modulation.
  • Demonstration of independent topological charge control for each vortex.
  • Observation of distinct orbiting dynamics and angular momentum transfer to microparticles within each vortex.
  • Analysis of angular velocity dependence on optical power and topological charge combinations.

Conclusions:

  • The multiplexed spiral phase mask is an effective tool for advanced optical trapping.
  • This method allows for precise, independent control of multiple optical vortices.
  • The study provides insights into angular momentum transfer dynamics in complex optical fields.