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Related Experiment Video

Updated: Jun 5, 2025

Optical Trap Loading of Dielectric Microparticles In Air
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Tunable on-chip optical traps for levitating particles based on single-layer metasurface.

Chuang Sun1, Hailong Pi1, Kian Shen Kiang1

  • 1University of Southampton, Southampton, UK.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

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Researchers developed a novel metasurface to create stable optical traps for multiple levitated nanoparticles. This breakthrough enables advanced studies in fundamental physics and scalable, high-sensitivity sensing applications.

Area of Science:

  • Optics
  • Nanotechnology
  • Quantum Physics

Background:

  • Optically levitated nanoparticles are crucial for studying fundamental physics and developing sensitive sensors.
  • Existing platforms for complex optical trapping face limitations in efficiency, stability, and scalability.
  • Advanced optical trapping landscapes are needed to engineer interactions beyond single harmonic traps.

Purpose of the Study:

  • To demonstrate a metasurface capable of generating tunable optical potential wells for multiple levitated nanoparticles.
  • To overcome the limitations of existing spatial light modulator-based platforms.
  • To enable new possibilities for studying particle interactions and developing advanced sensors.

Main Methods:

  • Experimentally fabricating and utilizing a metasurface to create two diffraction-limited focal points.
Keywords:
metasurfaceoptical bindingoptical levitationtunable trapping potential

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  • Achieving a high numerical aperture (∼0.9) and high efficiency (31%) with the metasurface.
  • Generating tunable optical potential wells, including bistable and double potential wells, by adjusting focal point distance.

    • Main Results:

    • Successfully generated tunable optical potential wells without intensity fluctuations.
    • Observed bistable and double potential wells experimentally.
    • Levitated two nanoparticles in double potential wells for extended periods (hours).

    Conclusions:

    • The metasurface provides a stable and efficient platform for complex optical trapping.
    • This method overcomes previous limitations, paving the way for scaling optomechanical devices.
    • Enables investigations into nonlinear/thermal dynamics and optical binding, and facilitates paralleled levitated sensors.