title: Transition from two-dimensional photonic crystals to dielectric metasurfaces in the optical diffraction with a fine structure.
abstract: We study experimentally a fine structure of the optical Laue diffraction from two-dimensional periodic photonic lattices. The periodic photonic lattices with the C4v square symmetry, orthogonal C2v symmetry, and hexagonal C6v symmetry are composed of submicron dielectric elements fabricated by the direct laser writing technique. We observe surprisingly strong optical diffraction from a finite number of elements that provides an excellent tool to determine not only the symmetry but also exact number of particles in the finite-length structure and the sample shape. Using different samples with orthogonal C2v symmetry and varying the lattice spacing, we observe experimentally a transition between the regime of multi-order diffraction, being typical for photonic crystals to the regime where only the zero-order diffraction can be observed, being is a clear fingerprint of dielectric metasurfaces characterized by effective parameters.
authors: Ioffe Institute, St. Petersburg 194021, Russia.|ITMO University, Department of Photonics of Dielectrics and Semiconductors, St. Petersburg 197101, Russia.
authors: Mikhail V
authors: MV
authors: Rybin
authors: Ioffe Institute, St. Petersburg 194021, Russia.|ITMO University, Department of Photonics of Dielectrics and Semiconductors, St. Petersburg 197101, Russia.
authors: Kirill B
authors: KB
authors: Samusev
authors: ITMO University, Department of Nanophotonics and Metamaterials, St. Petersburg, 197101, Russia.|Institute for Analytical Instrumentation RAS, Department of Nanophotonics and Metamaterials, St. Petersburg 198095, Russia.
authors: Stanislav Yu
authors: SY
authors: Lukashenko
authors: ITMO University, Department of Nanophotonics and Metamaterials, St. Petersburg, 197101, Russia.|Australian National University, Nonlinear Physics Center, Canberra ACT 2601, Australia.
authors: Yuri S
authors: YS
authors: Kivshar
authors: Ioffe Institute, St. Petersburg 194021, Russia.|ITMO University, Department of Photonics of Dielectrics and Semiconductors, St. Petersburg 197101, Russia.
authors: Mikhail F
authors: MF
authors: Limonov