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Programmable hyperbolic polaritons in van der Waals semiconductors.

A J Sternbach1, S H Chae2, S Latini3

  • 1Department of Physics, Columbia University, New York, NY 10027, USA. as5049@columbia.edu.

Science (New York, N.Y.)
|February 5, 2021
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Researchers observed optically induced electronic hyperbolicity in tungsten diselenide (WSe2) layered crystals. This finding challenges conventional optical principles and reveals new possibilities for light propagation in materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optics and Photonics

Background:

  • Electromagnetic radiation typically cannot propagate through material bulk due to collective electronic modes and lattice vibrations.
  • Layered crystals, particularly highly anisotropic materials, can exhibit unconventional optical properties, allowing for subdiffractional waveguide modes with hyperbolic dispersion.

Purpose of the Study:

  • To investigate and report the observation of optically induced electronic hyperbolicity in the layered transition metal dichalcogenide tungsten diselenide (WSe2).
  • To explore the potential for programmable hyperbolic electrodynamics and understand the role of quantum transitions in the observed polaritonic response.

Main Methods:

  • Utilized photoexcitation to generate electron-hole pairs within the WSe2 crystal.
  • Employed transient nanoimaging techniques to visualize the propagation of hyperbolic rays inside the material.

Main Results:

  • Successfully observed optically induced electronic hyperbolicity in WSe2.
  • Visualized hyperbolic rays traveling along conical trajectories within the crystal.
  • Established signatures of programmable hyperbolic electrodynamics.

Conclusions:

  • The study demonstrates that layered crystals like WSe2 can support hyperbolic propagation of light, defying traditional optical tenets.
  • Quantum transitions of excitons within the Rydberg series play a role in the observed polaritonic response, offering insights into novel optical phenomena.