Plasmon confinement in atomically thin and flat metallic films

T. Nagao, Shin Yaginuma, C. Liu, T. Inaoka, V. U. Nazarov, T. Nakayama, M. Aono

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    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 ID plasmon confinement in each atom chain.

    Original languageEnglish
    Title of host publicationPlasmonics
    Subtitle of host publicationMetallic Nanostructures and Their Optical Properties V
    DOIs
    Publication statusPublished - 2007 Dec 1
    EventPlasmonics: Metallic Nanostructures and Their Optical Properties V - San Diego, CA, United States
    Duration: 2007 Aug 262007 Aug 29

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume6641
    ISSN (Print)0277-786X

    Other

    OtherPlasmonics: Metallic Nanostructures and Their Optical Properties V
    CountryUnited States
    CitySan Diego, CA
    Period07/8/2607/8/29

    Keywords

    • Electron energy loss spectroscopy
    • Epitaxial growth
    • Low-dimensional materials
    • Plasmon dispersion
    • Silicon
    • Silver

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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