Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.57: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Voigt exceptional-points in anisotropic ZnO-based photonic structures — •Evgeny Krüger1, Steffen Richter1,2, Sebastian Henn1, Heinrich-Gregor Zirnstein3, Jesús Zúñiga-Pérez4, Christiane Deparis4, Lukas Trefflich2, Chris Sturm2, Bernd Rosenow3, Marius Grundmann1, and Rüdiger Schmidt-Grund1 — 1Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Linnéstr. 5, Leipzig — 2ELI Beamlines/Fyzikální Ústav AV CR, v.v.i., Za Radnicí 835, 25241 Dolní Brezany, Czech Republic — 3Universität Leipzig, Institut für Theoretische Physik, Brüderstr. 16, 04103 Leipzig — 4Université Côte d’Azur, CRHEA-CNRS, rue Bernard Gregóry, Valbonne, France
We report on exceptional points (EP) in planar ZnO-based microcavities with broken cylindrical symmetry, realized by inclining the optical axis of the uniaxial cavity layer to the mirror direction [1]. Such EPs represent non-Hermitian degeneracies in momentum space, related to a local complex-square-root topology of the resonator eigenenergies. The eigenmodes coalesce along these directions, yielding degeneracy in energy, broadening and polarization, the latter being either left or right circular. We prove the exceptional point nature experimentally and theoretically by monitoring the square-root topology around the EP and show how the occurrence and direction of EP can be controlled by the geometrical microcavity design.
[1] S. Richter et al., Phys. Rev. A 95, 023836 (2017)