Experimental demonstration of chip-scale orbital angular momentum (OAM) beams generation and detection using nanophotonic dielectric metasurface array

We design and experimentally investigate the generation of orbital angular momentum (OAM) beams with topological number from l = -4 to 4 at the wavelength of 632.8 nm utilizing the nanophotonic dielectric metasurface array. We also detect the generated OAM beams using the dielectric metasurface array corresponding to their inverted topological number.