Paper
25 September 2007 Plasmon confinement in atomically thin and flat metallic films
T. Nagao, S. Yaginuma, C. Liu, T. Inaoka, V. U. Nazarov, T. Nakayama, M. Aono
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Abstract
We report on the direct measurement of dispersion relations of plasmons confined in atomically thin metal films and wires by electron energy loss spectroscopy in wide energy-momentum range. Ultrathin Ag films are prepared on single crystal Si surfaces by molecular beam epitaxy, and its crystallinity is checked by electron diffraction. For the case of multi-atomic-layer Ag films, two plasmon modes are observed at around 3.9 eV and 1.8 eV which are localized at the top and the bottom surfaces of the films, respectively. For the case of Ag monoatomic layer, a single mode is observed that steeply disperses in the mid-infrared range. Nonlocal and quantum effects are found to be essential in understanding its full plasmon dispersion curve up to the critical wave number of Landau damping. For the case of Au atom chains, an anisotropic sound-wave-like plasmon dispersion is found that clearly shows 1D plasmon confinement in each atom chain.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Nagao, S. Yaginuma, C. Liu, T. Inaoka, V. U. Nazarov, T. Nakayama, and M. Aono "Plasmon confinement in atomically thin and flat metallic films", Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 664116 (25 September 2007); https://doi.org/10.1117/12.734246
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Cited by 2 scholarly publications.
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KEYWORDS
Plasmons

Silver

Crystals

Silicon

Spectroscopy

Diffraction

Chemical species

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