Bloch oscillations of hybrid light-matter particles in a waveguide array

Johannes Beierlein, Oleg A. Egorov, Tristan H. Harder, Philipp Gagel, Monika Emmerling, Christian Schneider, Sven Höfling, Ulf Peschel, Sebastian Klembt

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Bloch oscillations are a phenomenon well known from quantum mechanics where electrons in a lattice experience an oscillatory motion in the presence of an electric field gradient. Here, the authors report on Bloch oscillations of hybrid light−matter particles, called exciton‐polaritons (polaritons), being confined in an array of coupled microcavity waveguides. To this end, the waveguide widths and their mutual couplings are carefully designed such that a constant energy gradient is induced perpendicular to the direction of motion of the propagating polaritons. This technique allows us to directly observe and study Bloch oscillations in real‐ and momentum‐space. Furthermore, the experimental findings are supported by numerical simulations based on a modified Gross–Pitaevskii approach. This work provides an important transfer of basic concepts of quantum mechanics to integrated solid state devices, using quantum fluids of light.
Original languageEnglish
JournalAdvanced Optical Materials
VolumeEarly View
Early online date4 May 2021
Publication statusE-pub ahead of print - 4 May 2021


  • Bloch oscillations
  • Exciton- polariton
  • Polariton condensation
  • Waveguides


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