On-chip optical trapping with high NA metasurfaces

Jianling Xiao, Tomasz Tytus Plaskocinski, Mohammad Biabanifard, Saydulla Persheyev, Andrea Di Falco*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
12 Downloads (Pure)


Optical trapping of small particles typically requires the use of high NA microscope objectives. Photonic metasurfaces are an attractive alternative to create strongly focused beams for optical trapping applications in an integrated platform. Here, we report on the design, fabrication, and characterization of optical metasurfaces with a numerical aperture up to 1.2 and trapping stiffness greater than 400 pN/μm/W. We demonstrate that these metasurfaces perform as well as microscope objectives with the same numerical aperture. We systematically analyze the impact of the metasurface dimension on the trapping performance and show efficient trapping with metasurfaces with an area as small as 0.001 mm2. Finally, we demonstrate the versatility of the platform by designing metasurfaces able to create multisite optical tweezers for the trapping of extended objects.
Original languageEnglish
Pages (from-to)1341-1348
Number of pages8
JournalACS Photonics
Issue number5
Early online date15 Mar 2023
Publication statusPublished - 17 May 2023


  • Optical tweezers
  • Metasurface
  • High NA
  • Metalens
  • Holography
  • Lab-on-chip


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