Polarization singularities and optical chirality in dielectric metasurfaces Lucio Claudio Andreani, Dario Gerace, Momchil Minkov, Luca Zagaglia and Simone Zanotti EPJ Web Conf., 266 (2022) 09001 Published online: 13 October 2022 DOI: 10.1051/epjconf/202226609001