Excitation of long-wavelength surface optical vibrational modes in films, cubes and film/cube composite system using an atom-sized electron beam

Maureen J. Lagos, Andreas Trügler, Voshadhi Amarasinghe, Leonard C Feldman, Ulrich Hohenester, Philip E. Batson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Using spatially resolved Electron Energy-Loss Spectroscopy, we investigate the excitation of long-wavelength surface optical vibrational modes in elementary types of nanostructures: an amorphous SiO2 slab, an MgO cube, and in the composite cube/slab system. We find rich sets of optical vibrational modes strongly constrained by the nanoscale size and geometry. For slabs, we find two surface resonances resulting from the excitation of surface phonon polariton modes. For cubes, we obtain three main highly localized corner, edge, and face resonances. The response of those surface phonon resonances can be described in terms of eigenmodes of the cube and we show that the corresponding mode pattern is recovered in the spatially resolved EELS maps. For the composite cube/substrate system we find that interactions between the two basic structures are weak, producing minor spectral shifts and intensity variations (transparency behaviour), particularly for the MgO-derived modes.

Original languageEnglish
Pages (from-to)i3-i13
JournalMicroscopy
Volume67
DOIs
Publication statusPublished - Mar 1 2018

Fingerprint

Phonons
Large scale systems
Electron beams
vibration mode
Electron Energy-Loss Spectroscopy
electron beams
Electrons
Wavelength
Atoms
slabs
composite materials
Nanostructures
Electron energy loss spectroscopy
wavelengths
excitation
atoms
Composite materials
polaritons
Transparency
energy dissipation

Keywords

  • Infrared terahertz
  • Surface optical phonons
  • Surface phonon polariton
  • Vibrational EELS
  • Vibrational scattering cross-section

ASJC Scopus subject areas

  • Structural Biology
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

Cite this

Excitation of long-wavelength surface optical vibrational modes in films, cubes and film/cube composite system using an atom-sized electron beam. / Lagos, Maureen J.; Trügler, Andreas; Amarasinghe, Voshadhi; Feldman, Leonard C; Hohenester, Ulrich; Batson, Philip E.

In: Microscopy, Vol. 67, 01.03.2018, p. i3-i13.

Research output: Contribution to journalArticle

Lagos, Maureen J. ; Trügler, Andreas ; Amarasinghe, Voshadhi ; Feldman, Leonard C ; Hohenester, Ulrich ; Batson, Philip E. / Excitation of long-wavelength surface optical vibrational modes in films, cubes and film/cube composite system using an atom-sized electron beam. In: Microscopy. 2018 ; Vol. 67. pp. i3-i13.
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