Optical Mode Control by Geometric Phase in Quasicrystal Metasurface

Igor Yulevich, Elhanan Maguid, Nir Shitrit, Dekel Veksler, Vladimir Kleiner, Erez Hasman

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Abstract

We report on the observation of optical spin-controlled modes from a quasicrystalline metasurface as a result of an aperiodic geometric phase induced by anisotropic subwavelength structure. When geometric phase defects are introduced in the aperiodic structured surface, the modes exhibit polarization helicity dependence resulting in the optical spin-Hall effect. The radiative thermal dispersion bands from a quasicrystal structure are studied where the observed bands arise from the optical spin-orbit interaction induced by the aperiodic space-variant orientations of anisotropic antennas. The optical spin-flip behavior of the revealed modes that arise from the geometric phase pickup is experimentally observed within the visible spectrum by measuring the spin-projected diffraction patterns. The introduced ability to manipulate the light-matter interaction of quasicrystals in a spin-dependent manner provides the route for molding light via spin-optical aperiodic artificial planar surfaces.

Original languageEnglish
Article number205501
JournalPhysical Review Letters
Volume115
Issue number20
DOIs
StatePublished - 9 Nov 2015
Externally publishedYes

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