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Propagative Oscillations in Codirectional Polariton Waveguide Couplers.

J Beierlein1, E Rozas2, O A Egorov3

  • 1Technische Physik, Wilhelm-Conrad-Röntgen Research Center for Complex Material Systems, and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.

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Summary
This summary is machine-generated.

Researchers developed new devices to guide exciton-polaritons, observing Josephson-like oscillations in a waveguide. This breakthrough enables controllable light-matter particle routing for future compact logic devices.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Nanophotonics

Background:

  • Exciton-polaritons are light-matter quasiparticles formed by strong coupling between photons and excitons.
  • Controlling the flow of exciton-polaritons is crucial for developing novel optical devices.
  • Previous studies observed Josephson-like oscillations in coupled polariton traps, but not in waveguide systems.

Purpose of the Study:

  • To create and investigate novel exciton-polariton routing devices.
  • To demonstrate controllable guidance of exciton-polaritons in a waveguide architecture.
  • To explore Josephson-like oscillation phenomena in a propagative waveguide system.

Main Methods:

  • Fabrication of codirectional coupling devices with tunable waveguide coupling.
  • Experimental observation of real-space oscillations of the exciton-polariton condensate.
  • Systematic control of device parameters (gap width, channel length, propagation energy).

Main Results:

  • Demonstrated tunable coupling between two adjacent waveguides via evanescent coupling.
  • Observed Josephson-like oscillations of the exciton-polariton condensate in the waveguide device.
  • Showcased controllable routing of polariton flow by adjusting device parameters.

Conclusions:

  • The developed codirectional polariton device enables controllable routing of light-matter particles.
  • This waveguide-based design mimics Josephson-like oscillations observed in polariton traps.
  • The device serves as a passive, scalable coupler for compact, next-generation logic architectures.