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Title: Revealing Nanoscale Confinement Effects on Hyperbolic Phonon Polaritons with an Electron Beam

Journal Article · · Small
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Barcelona Institute of Science and Technology (BIST) (Spain); Brno University of Technology (Czech Republic)
  2. Kansas State Univ., Manhattan, KS (United States)
  3. Barcelona Institute of Science and Technology (BIST) (Spain); Catalan Institution for Research and Advanced Studies (Spain)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Hyperbolic phonon polaritons (HPhPs) in hexagonal boron nitride (hBN) enable the direct manipulation of mid-infrared light at nanometer scales, many orders of magnitude below the free-space light wavelength. High-resolution monochromated electron energy-loss spectroscopy (EELS) facilitates measurement of excitations with energies extending into the mid-infrared while maintaining nanoscale spatial resolution, making it ideal for detecting HPhPs. The electron beam is a precise source and probe of HPhPs, which allows the observation of nanoscale confinement in HPhP structures and directly extract hBN polariton dispersions for both modes in the bulk of the flake and modes along the edge. The measurements reveal technologically important nontrivial phenomena, such as localized polaritons induced by environmental heterogeneity, enhanced and suppressed excitation due to 2D interference, and strong modification of high-momenta excitations such as edge-confined polaritons by nanoscale heterogeneity on edge boundaries. Finally, the work opens exciting prospects for the design of real-world optical mid-infrared devices based on hyperbolic polaritons.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; European Research Council (ERC); European Commission (EC); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
AC05-00OR22725; 789104eNANO; SEV2015-0522; N00014-20-1-2474
OSTI ID:
1885385
Journal Information:
Small, Vol. 17, Issue 39; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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