Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Monday: Plasmonics and Nanooptics
O 21.6: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Optical tweezers with high-efficiency dielectric metalenses — •Christian Schlickriede1, Teanchai Chantakit1, Basudeb Sain1, Heinz-Siegfried Kitzerow1, Thomas Zentgraf1, and Nattaporn Chattham2 — 1Universität Paderborn, Paderborn, Germany — 2Kasetsart University, Bangkok, Thailand
In this work, we present a highly efficient all-dielectric metalens, which is able to optically trap polystyrene microbeads by tightly focusing the incident near-infrared light. In order to achieve a suitable numerical aperture, we use the concept of a geometric phase emerging from the configuration of rotated silicon meta-atoms. This intuitive and flexible design allows various application possibilities, for example multidimensional particle control by complex light fields. Depending on the incident circular polarization of light, the phase profile can be switched between convex and concave which makes this lens also a suitable candidate for polarization dependent particle trapping and antitrapping. In the experiments, we determine the trapping force exerted on the particles and we demonstrate three dimensional particle manipulation. With these results, we demonstrate metasurface enhanced optical tweezers with a broad range of applications in a very compact lab-on-a-chip-ready design.