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Stimulated plasmon polariton scattering.

C Wolff1, N A Mortensen2,3,4

  • 1Center for Nano Optics, University of Southern Denmark, Campusvej 55, Odense M, DK-5230, Denmark. cwo@mci.sdu.dk.

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|August 14, 2020
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Summary

We introduce stimulated plasmon polariton scattering (SPPS) to observe 2D polaritons. This new method amplifies and detects these particles across the THz-range using visible light, overcoming previous limitations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanophotonics

Background:

  • Two-dimensional (2D) and van-der-Waals materials exhibit plasmon and phonon polaritons of significant scientific interest.
  • Observing these polaritons is challenging due to strong confinement, low frequency, and longitudinal mode symmetry in linear response.

Purpose of the Study:

  • To propose and validate a novel method for exciting, amplifying, and detecting 2D plasmon and phonon polaritons.
  • To overcome the limitations of linear response techniques for studying these quasiparticles.

Main Methods:

  • Development of a nonlinear resonant scattering technique termed stimulated plasmon polariton scattering (SPPS), analogous to stimulated Brillouin scattering (SBS).
  • Utilizing optical components in the near-infrared or visible range to interact with THz-range polaritons.
  • Formulation of a coupled-mode theory framework to analyze SPPS.

Main Results:

  • SPPS enables the excitation, amplification, and detection of 2D plasmon and phonon polaritons across the entire THz-range.
  • The method requires only near-IR or visible light optical components, simplifying experimental setups.
  • SPPS demonstrates power gains at least an order of magnitude higher than state-of-the-art on-chip SBS.

Conclusions:

  • SPPS offers a powerful new tool for fundamental studies of 2D materials.
  • This technique has the potential to significantly advance THz spectroscopy and information technology by bridging the 'THz gap'.