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Negative refraction in hyperbolic hetero-bicrystals.

A J Sternbach1, S L Moore1, A Rikhter2

  • 1Department of Physics, Columbia University, New York, NY, USA.

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|February 9, 2023
PubMed
Summary
This summary is machine-generated.

Researchers visualized negative refraction in phonon polaritons, which are hybrids of infrared photons and lattice vibrations. These polaritons exhibited unique light-bending properties at the interface of two natural crystals, molybdenum oxide and hexagonal boron nitride.

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Area of Science:

  • Condensed matter physics
  • Optics and photonics
  • Materials science

Background:

  • Phonon polaritons are quasiparticles formed by the coupling of photons and optical phonons.
  • Hyperbolic van der Waals materials exhibit unique optical properties due to their anisotropic dielectric permittivity.
  • Negative refraction is an exotic optical phenomenon where light bends in the opposite direction than expected.

Purpose of the Study:

  • To experimentally visualize and demonstrate negative refraction of phonon polaritons.
  • To investigate the behavior of phonon polaritons at the interface between two different hyperbolic van der Waals materials.
  • To explore the dispersion properties and potential for novel optical phenomena.

Main Methods:

  • Utilized infrared spectroscopy to probe phonon polariton propagation.
  • Fabricated heterostructures of molybdenum oxide (MoO3) and isotopically pure hexagonal boron nitride (h11BN).
  • Analyzed the wavevector and frequency dependence of the polariton modes.

Main Results:

  • Observed clear evidence of negative refraction for phonon polaritons at the MoO3/h11BN interface.
  • Demonstrated that these polaritons form collimated rays exhibiting negative refraction.
  • Identified unique closed diamond-shaped trajectories at a specific frequency (ω0).
  • Characterized polariton eigenmodes showing regions of positive and negative dispersion with multiple band gaps.

Conclusions:

  • The study provides direct visualization of negative refraction in phonon polaritons.
  • The findings highlight the potential of hyperbolic van der Waals materials for controlling light at the nanoscale.
  • The observed dispersion properties suggest possibilities for designing novel optical devices and phenomena.