CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Imaging Ultrafast Plasmon Dynamics within a Complex Dolmen Nanostructure Using Photoemission Electron Microscopy |
Jiang Qin1, Peng Lang1, Bo-Yu Ji1, N. K. Alemayehu1, Han-Yan Tao1, Xun Gao1, Zuo-Qiang Hao1**, Jing-Quan Lin1,2** |
1School of Science, Changchun University of Science and Technology, Changchun 130022 2International Research Center for Nano Handling and Manufacturing of China, Changchun University of Science and Technology, Changchun 130022
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Cite this article: |
Jiang Qin, Peng Lang, Bo-Yu Ji et al 2016 Chin. Phys. Lett. 33 116801 |
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Abstract We report direct nanoscale imaging of ultrafast plasmon in a gold dolmen nanostructure excited with the 7 fs laser pulses by combining the interferometric time-resolved technology with the three-photon photoemission electron microscopy (PEEM). The interferometric time-resolved traces show that the plasmon mode beating pattern appears at the ends of the dimer slabs in the dolmen nanostructure as a result of coherent superposition of multiple localized surface plasmon modes induced by broad bandwidth of the ultrafast laser pulses. The PEEM measurement further discloses that in-phase of the oscillation field of two neighbor defects are surprisingly observed, which is attributed to the plasmon coupling between them. Furthermore, the control of the temporal delay between the pump and probe laser pluses could be utilized for manipulation of the near-field distribution. These findings deepen our understanding of ultrafast plasmon dynamics in a complex nanosystem.
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Received: 31 August 2016
Published: 28 November 2016
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PACS: |
68.37.Xy
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(Scanning Auger microscopy, photoelectron microscopy)
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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Fund: Supported by the National Basic Research Program of China under Grant No 2013CB922404, the National Natural Science Foundation of China under Grant Nos 11474040, 11474039, 61605017 and 61575030, and the Project of Changchun Science and Technology Bureau under Grant No 14KP007. |
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