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O: Fachverband Oberflächenphysik

O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects

O 33.7: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Optical trapping by silicon based high numerical aperture metalenses — •Rene Geromel, Basudeb Sain, Christian Schlickriede, Michael Tiemann, and Thomas Zentgraf — Universität Paderborn, Paderborn, Deutschland

In this work, we present a high numerical aperture metalens that focuses near-infrared laser light to optically trap dissolved polystyrene microbeads with different diameters. To increase the numerical aperture of our metalenses, the silicon antennas are embedded in porous silicon dioxide. The porous coating also acts as a protective layer and allows us to place the metalens directly inside the particle solution. In order to achieve an appropriate numerical aperture, we use the concept of a geometric phase emerging from the configuration of rotated silicon meta-atoms. Depending on the incident circular polarization of light, the phase profile can be switched between convex and concave which makes this lens a suitable candidate for polarization dependent particle drag and drop. In the experiments, we investigate the trap stiffness and potential of the metalenses.