Probing of Ultrafast Plasmon Dynamics on Gold Bowtie Nanostructure Using Photoemission Electron Microscopy

We report the direct imaging of plasmon on the tips pulses and probing of ultrafast plasmon dynamics by of nano-prisms in a bowtie structure excited by 7 fs laser combining the pump-probe technology with three-photon photoemission electron microscopy. Different photoemission patterns induced by the...

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Bibliographic Details
Published in:Chinese physics letters 2015-06, Vol.32 (6), p.61-65
Main Author: 秦将 季博宇 郝作强 林景全
Format: Article
Language:English
Subjects:
Dynamics
Electron microscopy
Excitation
Lasers
Nanostructure
Photoemission
Plasmons
Tips
光电
发射电子显微镜
泵浦-探测
直接成像
等离子体动力学
纳米结构
脉冲等离子体
飞秒激光脉冲
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Summary:We report the direct imaging of plasmon on the tips pulses and probing of ultrafast plasmon dynamics by of nano-prisms in a bowtie structure excited by 7 fs laser combining the pump-probe technology with three-photon photoemission electron microscopy. Different photoemission patterns induced by the plasmon effect are observed when the bowties are excited by s- and p-polarized femtosecond laser pulses. A series of images of the evolution of local surface plasmon modes on different tips of the bowtie are obtained by the time-resolved three-photon photoemission electron microscopy, and the result discloses that plasmon excitation is dominated by the interfer- ence of the pump and probe pulses within the first 13 fs of the delay time, and thereafter the individual plasmon starts to oscillate on its own characteristic resonant frequencies.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/6/064202