Topological photonic crystals in the visible: design and angle-resolved characterization of the bulk and edge states

ORAL

Abstract

We fabricated and characterized photonic crystals with non-trivial topological bulk states and pseudo-time-reversal-symmetry protected helical edge states in the visible regime. Hexagonal silicon photonic crystals with a lattice constant of 450nm were fabricated on 10nm Si3N4 membranes utilizing electron beam lithography and reactive ion etching. With a 30-keV electron beam, we excite coherent cathodoluminescence in the nanostructured material and derive photonic band structures based on angles as well as frequencies of the emitted light. Further investigation into polarization states of the emitted light with both plane wave excitation and electron beam excitation reveal edge states that are pseudo-spin orbit coupled.

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Presenters

  • Siying Peng

    • Caltech

Authors

  • Siying Peng

    • Caltech

  • Nick Schilder

    • AMOLF

  • Sophie Meuret

    • AMOLF

  • Hugo Doeleman

    • AMOLF

  • Xiang Ni

    • City college of New York

  • Toon Coenen

    • AMOLF

  • Femius Koenderink

    • AMOLF

  • Alexander Khanikaev

    • City college of New York

  • Andrea Alu

    • The University of Texas at Austin
    • Univ of Texas, Austin

  • Harry Atwater

    • Caltech
    • Applied Physics and Materials Science, California Institute of Technology
    • California Institute of Technology
    • Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology
    • Applied Physics and Material Science, Caltech
    • Thomas J. Watson Laboratories of Applied Physics, California Institute of Technology
    • Applied Physics and Materials Sciences, California Institute of Technology
    • Applied Physics and Material Science, California Institute of Technology

  • Albert Polman

    • AMOLF