Publication detail

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

KONEČNÁ, A. LI, J. EDGAR, J. H. DE ABAJO, G. HACHTEL, J.A.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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. The work opens exciting prospects for the design of real-world optical mid-infrared devices based on hyperbolic polaritons.

Keywords

2D materials; hexagonal boron nitride; hyperbolic phonon polaritons; infrared spectroscopy; monochromated electron energy-loss spectroscopy; nanophotonics; optoelectronics

Authors

KONEČNÁ, A.; LI, J.; EDGAR, J. H.; DE ABAJO, G.; HACHTEL, J.A.

Released

28. 8. 2021

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

1613-6810

Periodical

Small

Year of study

17

Number

39

State

Federal Republic of Germany

Pages from

1

Pages to

9

Pages count

9

URL

https://onlinelibrary.wiley.com/doi/10.1002/smll.202103404

BibTex

@article{BUT172666,
  author="KONEČNÁ, A. and LI, J. and EDGAR, J. H. and DE ABAJO, G. and HACHTEL, J.A.",
  title="Revealing Nanoscale Confinement Effects on Hyperbolic Phonon Polaritons with an Electron Beam",
  journal="Small",
  year="2021",
  volume="17",
  number="39",
  pages="1--9",
  doi="10.1002/smll.202103404",
  issn="1613-6810",
  url="https://onlinelibrary.wiley.com/doi/10.1002/smll.202103404"
}