Multifunctional Snoptical Gradient Metasurfaces

Dekel Veksler Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel Elhanan Maguid Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel Dror Ozeri Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel Nir Shitrit Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel Vladimir Kleiner Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel Erez Hasman Nanotechnology and Nanoscience, Technion-Israel Institute of Technology, Haifa, Israel

Photonic gradient metasurfaces are ultrathin electromagnetic wave-molding metamaterials that provide a route for realizing flat optics. However, the up-to-date metasurface design, manifested by imprinting the required phase profile for a single, on-demand light manipulation functionality, is not compatible with the desired goal of multifunctional flat optics. We present a generic concept to control multifunctional optics by disordered (random) gradient metasurfaces with a custom-tailored geometric phase. This approach combines the peculiar ability of random patterns to support extraordinary information capacity, and the polarization helicity control in the geometric phase mechanism, simply implemented in a two-dimensional structured matter by imprinting optical antenna patterns. By manipulating the local orientations of the nanoantennas, we generate multiple wavefronts with different functionalities via mixed random antenna groups, where each group controls a different phase function.

dekel@tx.technion.ac.il