On-chip optical trapping with high NA metasurfaces
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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.
Xiao , J , Plaskocinski , T T , Biabanifard , M , Persheyev , S & Di Falco , A 2023 , ' On-chip optical trapping with high NA metasurfaces ' , ACS Photonics , vol. 10 , no. 5 , pp. 1341-1348 . https://doi.org/10.1021/acsphotonics.2c01986
Copyright © 2023 The Authors. Published by American Chemical Society licensed under Creative Commons License.
DescriptionFunding: The project was supported by the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Program (Grant Agreement No. 819346).
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