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Optical Trapping of Nanoparticles
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On-Chip Optical Trapping with High NA Metasurfaces.

Jianling Xiao1, Tomasz Plaskocinski1, Mohammad Biabanifard1

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Photonic metasurfaces offer a compact alternative to microscope objectives for optical trapping. These integrated devices achieve high performance, enabling efficient trapping of small particles and even extended objects.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Biophysics

Background:

  • High numerical aperture (NA) microscope objectives are standard for optical trapping.
  • Photonic metasurfaces offer miniaturized, integrated solutions for beam manipulation.
  • Developing metasurfaces for optical trapping requires precise design and fabrication.

Purpose of the Study:

  • To design, fabricate, and characterize photonic metasurfaces for optical trapping.
  • To evaluate the performance of metasurfaces against conventional microscope objectives.
  • To explore the scalability and versatility of metasurface-based optical tweezers.

Main Methods:

  • Design and fabrication of optical metasurfaces with NA up to 1.2.
  • Characterization of trapping stiffness and performance.
  • Analysis of metasurface dimensions' impact on trapping efficiency.
  • Demonstration of multisite optical tweezers for extended objects.

Main Results:

  • Metasurfaces achieved NA up to 1.2 and trapping stiffness > 400 pN/μm/W.
  • Performance comparable to high-NA microscope objectives.
  • Efficient trapping demonstrated with metasurfaces as small as 0.001 mm².
  • Successful design of multisite optical tweezers for extended objects.

Conclusions:

  • Photonic metasurfaces provide a viable, integrated alternative for optical trapping.
  • Metasurface performance is scalable and adaptable for various trapping applications.
  • This platform enables advanced optical manipulation with miniaturized devices.