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 language | English |
|---|---|
| Pages (from-to) | i3-i13 |
| Journal | Microscopy |
| Volume | 67 |
| DOIs | |
| Publication status | Published - Mar 1 2018 |
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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 journal › Article
}
TY - JOUR
T1 - Excitation of long-wavelength surface optical vibrational modes in films, cubes and film/cube composite system using an atom-sized electron beam
AU - Lagos, Maureen J.
AU - Trügler, Andreas
AU - Amarasinghe, Voshadhi
AU - Feldman, Leonard C
AU - Hohenester, Ulrich
AU - Batson, Philip E.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - 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.
AB - 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.
KW - Infrared terahertz
KW - Surface optical phonons
KW - Surface phonon polariton
KW - Vibrational EELS
KW - Vibrational scattering cross-section
UR - http://www.scopus.com/inward/record.url?scp=85044526443&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044526443&partnerID=8YFLogxK
U2 - 10.1093/jmicro/dfx130
DO - 10.1093/jmicro/dfx130
M3 - Article
AN - SCOPUS:85044526443
VL - 67
SP - i3-i13
JO - Microscopy (Oxford, England)
JF - Microscopy (Oxford, England)
SN - 2050-5698
ER -