Towards active electro-optic lithium niobate metasurfaces Flavia Timpu, Helena Weigand, Fabian Kaufmann, Felix U. Richter, Viola-Valentina Vogler-Neuling, Artemios Karvounis and Rachel Grange EPJ Web Conf., 238 (2020) 05003 Published online: 20 August 2020 DOI: 10.1051/epjconf/202023805003