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Polaritonic states trapped by topological defects.

Daria Smirnova1, Filipp Komissarenko2, Anton Vakulenko2

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We demonstrate trapping mid-infrared structured phonon-polaritons in topological defects of a hexagonal boron nitride (hBN) metasurface. This enables control over light-matter interactions for advanced photonic devices.

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Area of Science:

  • Condensed Matter Physics
  • Nanophotonics
  • Materials Science

Background:

  • Miniaturization of photonic technologies requires integrating diverse materials for chip-scale devices.
  • Topological photonic systems offer robust 1D polaritonic transport by coupling light with matter excitations.

Purpose of the Study:

  • To demonstrate efficient trapping of mid-infrared structured phonon-polaritons in topological defects.
  • To explore the properties and potential applications of these localized modes.

Main Methods:

  • Integration of hexagonal boron nitride (hBN) with a Kekulé-patterned metasurface.
  • Creation of topological defects by stitching displaced domains.
  • Imaging of 0D higher-order topological modes in real- and Fourier-space.

Main Results:

  • Successfully trapped mid-IR structured phonon-polaritons in topological defects.
  • Observed localized polaritonic modes with chiral polarization, comprising phononic and photonic components.
  • Revealed singular radiation leakage and selective excitation via spin-polarized edge waves.

Conclusions:

  • The demonstrated mechanism allows for efficient control of light-matter waves in topological defects.
  • Impactful opportunities for topological polariton shaping, ultrathin light sources, and nanoscale thermal management.