Toward high-performance plasmonic metasurfaces: from forward to inverse design approach

In this talk, I will present two strategies to realize high-performance metasurfaces. Firstly, by introducing the generalized kerker condition to the plasmonic metasurface, we acquired a circular cross-polarization conversion efficiency higher than 50% in transmission at telecom wavelengths. We also demonstrated a couple of meta-devices with record operating efficiency based on the proposed metasurface. Secondly, I will introduce the Monte Carlo tree search (MCTS) algorithm combined with unsupervised clustering for the inverse design of metasurfaces. With the proposed method, we realized a beam steering metasurface, which is capable of deflecting normally incident light into target directions with minimal sidelobes intensity.