Observation of Plasmon Wave Packet Motions via Femtosecond Time-Resolved Near-Field Imaging Techniques

Yoshio Nishiyama, Kohei Imura, Hiromi Okamoto

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    The generation and dynamics of plasmon wave packets in single gold nanorods were observed at a spatiotemporal scale of 100 nm and 10 fs via time-resolved near-field optical microscopy. Following simultaneous excitation of two plasmon modes of a nanorod with an ultrashort near-field pulse, a decay and revival feature of the time-resolved signal was obtained, which reflected the reciprocating motion of the wave packet. The time-resolved near-field images were also indicative of the wave packet motion. At some period of time after the excitation, the spatial features of the two modes appeared alternately, showing motion of plasmonic wave crests along the rod. The wave packet propagation was clearly demonstrated from this observation with the aid of a simulation model. The present experimental scheme opens the door to coherent control of plasmon-induced optical fields in a nanometer spatial scale and femtosecond temporal scale.

    Original languageEnglish
    Pages (from-to)7657-7665
    Number of pages9
    JournalNano Letters
    Volume15
    Issue number11
    DOIs
    Publication statusPublished - 2015 Nov 11

    Fingerprint

    Wave packets
    imaging techniques
    wave packets
    near fields
    Imaging techniques
    Nanorods
    nanorods
    time signals
    Gold
    excitation
    Optical microscopy
    rods
    gold
    microscopy
    propagation
    decay
    pulses
    simulation

    Keywords

    • nanoscale
    • near-field optical microscopy
    • Plasmon wave packet
    • ultrafast dynamics

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanical Engineering

    Cite this

    Observation of Plasmon Wave Packet Motions via Femtosecond Time-Resolved Near-Field Imaging Techniques. / Nishiyama, Yoshio; Imura, Kohei; Okamoto, Hiromi.

    In: Nano Letters, Vol. 15, No. 11, 11.11.2015, p. 7657-7665.

    Research output: Contribution to journalArticle

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