3 November 2016 Control and mapping ultrafast plasmons with PEEM
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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. 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. On the other hand, control of the near-field distribution was realized by variation of the phase delay of two orthogonally polarized 200fs laser pulses. The experimental results of the optical near-field distribution control are well reproduced by finite-difference time-domain simulations and understood by linear combination of electric charge distribution of the bowtie by s- and p- polarized light illumination. In addition, an independent shift of the excitation position or the phase of the near-field can be realized by coherent control of two orthogonally polarized fs laser pulses.
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Boyu Ji, Jiang Qin, Peng Lang, Alemayehu Nana Koya, Zuoqiang Hao, Xiaowei Song, Jingquan Lin, "Control and mapping ultrafast plasmons with PEEM", Proc. SPIE 10028, Plasmonics II, 100280G (3 November 2016); doi: 10.1117/12.2247717; https://doi.org/10.1117/12.2247717
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