Abstract
In combining time-resolved two-photon photoemission (TR-2PPE) and photoemission electron microscopy (PEEM) the ultra-fast dynamics of collective electron excitations in silver nanoparticles (localized surface plasmons – LSPs) is probed at fs and nm resolution. Here we demonstrate that the sampling of the LSP dynamics by means of time-resolved PEEM enables detailed insight into the propagation processes associated with these excitations. In phase-integrated as well as phase-resolved measurements we observe spatio-temporal modulations in the photoemission yield from a single nanoparticle. These modulations are assigned to local variations in the electric near field as a result of the phase propagation of a plasmonic excitation through the particle. Furthermore, the control of the phase between the fs pump and probe laser pulses used for these experiments can be utilized for an external manipulation of the nanoscale electric near-field distribution at these particles.
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78.47.+p; 78.67.Bf; 79.60.-i; 73.20.Mf
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Bauer, M., Wiemann, C., Lange, J. et al. Phase propagation of localized surface plasmons probed by time-resolved photoemission electron microscopy. Appl. Phys. A 88, 473–480 (2007). https://doi.org/10.1007/s00339-007-4056-z
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DOI: https://doi.org/10.1007/s00339-007-4056-z