Visible Light Metasurfaces Assembled by Quasiperiodic Dendritic Cluster Sets

Periodic metasurfaces have achieved various light manipulations. However, the preparation of those responding in visible waveband still encounters many constraints. Inspired by the idea of the Gerchberg–Saxton algorithm, a quasiperiodic dendritic cluster set metasurface is proposed where the cluster is used as the unit instead of cell that is used as the unit in the periodic metasurface. By gradually changing the theoretical model from periodic to quasiperiodic structure and the dendritic cluster sets prepared through a bottom-up electrochemical deposition method from disordered to quasiperiodic distribution, the simulation and experimental results show that, when the two both resonate in visible light, the quasiperiodic cluster set metasurface can produce nearly the same abnormal optical responses as those produced by the periodic metasurfaces, and this metasurface is isotropic. The experiments show that the sample can generate an anomalous spin Hall effect of light in a red light band. This anomalous manipulation of angular momentum of light enables the metasurface to be applicable to the fields of quantum optics and information. This method establishes a new means for developing optical metasurfaces.