Ultrafast Plasmonics

The unique properties of localized surface plasmons (LSPs) and propagating surface plasmon polaritons (SPPs) permitting sub-wavelength confinement, light velocity propagation and highly localized sensing are the key features for combining broadband optics and nanoscale electronics. As a vision for potential applications plasmon-based devices could be utilized in future generation on-chip communication and signal processing. Due to these prospects broadband plasmonic excitations and their interaction with nanoscale systems have attracted considerable interest in recent years.  More...

ITR-2PPEEM Daten
Switching of a plasmonic lens with photochromic molecules: PEEM data (top) and simulations (bottom); data from [3];

Our research addresses fundamental properties of ultrashort plasmonic excitations on the relevant length- and time-scales. We investigate aspects such as the SPP dispersion relation in plasmonic waveguides [1], the interaction of elementary plasmonic excitations in model-type nano-optical devices [2], and the manipualtion of plasmonic excitations using molecular switches [3]. Experiments are conducted using interferometric time-resolved two-photon photoemission electron microscopy (ITR-2PPEEM), a technique that provides femtosecond-temporal and sub-100 nm spatial resolution. The movie shows ITR-2PPEEM data of a 15 fs SPP wave packet propagating at near-light velocity along a gold-vacuum interface in interaction with a dipolar LSP mode of a gold nano particle [2].

ITR-2PPEEM data of a 15fs SPP wave packet in interaction with a dipolar LSP mode;

[1] “Morphological tuning of the plasmon dispersion in dielectric-loaded nanofiber waveguides“ T. Leißner, C. Lemke, J. Fiutowski, J. W. Radke, A. Klick, L. Tavares, J. Kjelstrup-Hansen, H.-G. Rubahn, M. Bauer, Phys. Rev. Lett. 111 (2013) 46802. doi:10.1103/PhysRevLett.111.046802

[2] “The Interplay between Localized and Propagating Plasmonic Excitations tracked in Space and Time“ C. Lemke, T. Leißner, A. Evlyukhin, J. W. Radke, A. Klick, J. Fiutowski, J. Kjelstrup-Hansen, H. -G. Rubahn, B. Chichkov, C. Reinhardt, M. Bauer; Nano Letters 14 (2014) 2431. doi:10.1021/nl500106z

[3] “Light-triggered Control of Plasmonic Refractionand Group Delay by Photochromic Molecular Switches“ M. Großmann, A. Klick, C. Lemke, J. Falke, M. Black, J. Fiutowski, A. Goszczak, E. Sobolewska, A. Usman Zillohu, M. Keshavarz Hedayati, H.-G. Rubahn, F. Faupel, M. Elbahri, and M.Bauer; ACS Photonics 2 (2015) 1327 – 1332. doi:10.1021/acsphotonics.5b00315

Funding:
DFG priority programm SPP 1391 ‚Ultrafast Nanooptics‘
DFG Collaborative Research Center SFB 677 ‚Function by Switching‘

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