Probing of Ultrafast Plasmon Dynamics on Gold Bowtie Nanostructure Using Photoemission Electron Microscopy
QIN Jiang1 , JI Bo-Yu1 , HAO Zuo-Qiang1** , LIN Jing-Quan1,2**
1 School of Science, Changchun University of Science and Technology, Changchun 1300222 International Research Center for Nano Handling and Manufacturing of China, Changchun 130022
Abstract ：We report the direct imaging of plasmon on the tips of nano-prisms in a bowtie structure excited by 7 fs laser pulses and probing of ultrafast plasmon dynamics by 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 interference 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.
收稿日期: 2015-02-07
出版日期: 2015-06-30
:
42.65.Re
(Ultrafast processes; optical pulse generation and pulse compression)
68.37.Xy
(Scanning Auger microscopy, photoelectron microscopy)
78.47.J-
(Ultrafast spectroscopy (<1 psec))
78.67.Bf
(Nanocrystals, nanoparticles, and nanoclusters)
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2015, Vol. 32 
