Origin of extrinsic chirality in metasurfaces and nanoholes fabricated by nanosphere lithographyEmilija Petronijevic, Tiziana Cesca, Carlo Scian, Giovanni Mattei, Roberto Li Voti, Concita Sibilia and Alessandro BelardiniEPJ Web Conf., 309 (2024) 06014DOI: https://doi.org/10.1051/epjconf/202430906014