Spatiotemporal imaging of plasmonic fields near metallic nanoparticles beyond the diffraction limit

Optically induced collective conduction electron oscillations can generate intense plasmonic field near nanoparticles [1, 2]. Based on simulated streaked photoemission spectra, we suggest a method for reconstructing nanoplasmonic fields near metal nanospheres with nm spatial and sub-fs temporal resolution. We apply this imaging scheme to Au nanospheres and scrutinize the accuracy of the spatiotemporally reconstructed plasmonic near-field distributions in comparison with a directly calculated plasmonic field using Mie theory [3]. [1] E. Saydanzad, J. Li, and U. Thumm, Phys. Rev. A \textbf{95}, 053406 (2017) [2] J. Li, E. Saydanzad, and U. Thumm, Phys. Rev. A \textbf{94}, 051401(R) (2016); Phys. Rev. A \textbf{95}, 043423 (2017). [3] E. Saydanzad, J. Li, and U. Thumm, in preparation.