On-chip integrated metasurfaces for circular light polarization for trapped-ion quantum applications Anastasiia Sorokina, Pascal Gehrmann, Steffen Sauer, Carl-Frederik Grimpe, Guochun Du, Elena Jordan, Tanja Mehlstäubler and Stefanie Kroker EPJ Web Conf., 287 (2023) 01017 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328701017