Overview of project B06
Relaxation Pathways for Collective Electronic Excitations
In project B06, the phase-fronts of femtosecond surface plasmon polariton (SPP) pulses are controlled on a sub-wavelength scale by using structured grating couplers. This provides the opportunity to create tailored SPP pulses which induce field strengths and polarizations at the surface that are not achievable with optical methods. The figure illustrates how the project uses Archimedean spirals on Au(111) platelets  to create an SPP focus [2, 3]. It is important to note that after SPP excitation the phase fronts propagate to the center of the spiral, and that the exciting femtosecond laser pulses are not present any more when the SPP focus is formed. This spatiotemporal separation allows to investigate the SPP focus in the absence of light, which constitutes a unique experimental situation. The aim of project B06 is to investigate the coupling of SPPs to the electron system in the plasmonic strong-field regime, and to investigate the related (plasmo)emission  of electrons with pump-probe photoemission electron microscopy (PEEM). In a normal-incidence geometry for the laser-pulses , this method allows imaging the propagation of SPPs with sub-wavelength resolution on a femtosecond time-scale . Furthermore, the electrons emitted from the focus can not only be analyzed with respect to their in spatial distribution, but also their momentum and/or energy-distribution is accessible to the experiment. Project B06 collaborates closely with Project A04, where field-enhancement effects in plasmonic particle-dimers are of interest .
Figure: (top) Au (111) platelet with a grating coupler in the shape of an Archimedean spiral, structured using focused ion beams. (bottom left) Design of the grating coupler. If the shown spiral is excited with circularly polarized light results in circular SPP phase-fronts and a SPP focus in the center oft he spiral. (bottom right) PEEM image of the SPP phase fronts and the resulting focus. The work-function of the sample has been lowered by Cs to make the phase-fronts visible.
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2. Spektor, G., et al., Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices. Science, 2017. 355(6330): p. 1187-1191.
3. Frank, B., et al., Short-range surface plasmonics: Localized electron emission dynamics from a 60-nm spot on an atomically flat single-crystalline gold surface. Sci Adv, 2017. 3(7): p. e1700721.
4. Podbiel, D., et al., Imaging the Nonlinear Plasmoemission Dynamics of Electrons from Strong Plasmonic Fields. Nano Lett, 2017. 17(11): p. 6569-6574.
5. Kahl, P., et al., Normal-Incidence Photoemission Electron Microscopy (NI-PEEM) for Imaging Surface Plasmon Polaritons. Plasmonics, 2014. 9(6): p. 1401-1407.
6. Kahl, P., et al., Direct Observation of Surface Plasmon Polariton Propagation and Interference by Time-Resolved Imaging in Normal-Incidence Two Photon Photoemission Microscopy. Plasmonics, 2018. 13(1): p. 239-246.
7. Schumacher, L., et al., Precision Plasmonics with Monomers and Dimers of Spherical Gold Nanoparticles: Nonequilibrium Dynamics at the Time and Space Limits. Journal of Physical Chemistry C, 2019. 123(21): p. 13181-13191.
Daniel Podbiel, Philip Kahl, Bettina Frank, Timothy J. Davis, Harald Giessen, Michael Horn-von Hoegen and Frank Meyer zu Heringdorf
Spatio-Temporal Analysis of an Efficient Fresnel Grating Coupler for Focussing Surface Plasmon Polaritons
ACS Photonics 6, 600 (2019)
Ludmilla Schumacher, Jesil Jose, David Janoschka, Pascal Dreher, Timothy J. Davis, Manuel Ligges, Renkai Li, Mianzhen Mo, Suji Park, Xiaozhe Shen, Stephen Weathersby, Jie Yang, Xijie Wang, Frank Meyer zu Heringdorf, Klaus Sokolowski-Tinten and Sebastian Schlücker
Precision Plasmonics with Monomers and Dimers of Spherical Gold Nanoparticles: Non-Equilibrium Dynamics at the Time and Space Limit
J. Phys. Chem. C 123, 13181 (2019)
Bernd Hafke, Tobias Witte, David Janoschka, Pascal Dreher, Frank Meyer zu Heringdorf and Michael Horn-von Hoegen
Condensation of Ground State from a Supercooled Phase in the Si(111)-(4×1) → (8×2)-Indium Atomic Wire System
Struct. Dyn. 6, 045101 (2019)
Philip Kahl, Daniel Podbiel, Christian Schneider, Andreas Makris, Simon Sindermann, Christian Witt, Deirdre Kilbane, Michael Horn-von Hoegen, Martin Aeschlimann and Frank Meyer zu Heringdorf
Direct Observation of Surface Plasmon Polariton Propagation and Interference by Time-Resolved Imaging in Normal-Incidence Two Photon Photoemission Microscopy
Plasmonics 13, 239 (2018)
Frank Meyer zu Heringdorf, David Janoschka and Pascal Dreher
A Space-Time Analysis of Electron Emission from a Focusing Structure for Surface Plasmon Polaritons using Photoemission Microscopy
Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300C (2018)
Pascal Dreher, David Janoschka and Frank Meyer zu Heringdorf
Observing the Sub-Femtosecond Dynamics of Plasmonic Bragg Reflectors by Time-Resolved Photoemission Electron Microscopy
Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105301A (2018)
G. Spektor, D. Kilban, A. K. Mahro, B. Frank, S. Ristok, L. Gal, P. Kahl, D. Podbiel, S. Mathias, H. Giessen, F.-J. Meyer zu Heringdorf, M. Orenstein and M. Aeschlimann
Revealing the Subfemtosecond Dynamics of Orbital Angular Momentum in Nanoplasmonic Vortices
Science 355, 1187 (2017)
Daniel Podbiel, Philip Kahl, Andreas Makris, Bettina Frank, Simon Sindermann, Timothy J. Davis, Harald Giessen, Michael Horn-von Hoegen and Frank Meyer zu Heringdorf
Imaging the Nonlinear Plasmoemission Dynamics of Electrons from Strong Plasmonic Fields
Nano Lett. 17, 6569 (2017)
Timothy J. Davis, Frank Meyer zu Heringdorf, Bettina Frank, Philip Kahl, Harald Giessen and Daniel Podbiel
Subfemtosecond and Nanometer Plasmon Dynamics with Photoelectron Microscopy: Theory and Efficient Simulations
ACS Photonics 4, 246 (2017)
Bettina Frank, Philip Kahl, Daniel Podbiel, Grisha Spektor, Meir Orenstein, Liwei Fu, Thomas Weiss, Michael Horn-von Hoegen, Timothy J Davis, Frank Meyer zu Heringdorf and Harald Giessen
Short-Range Surface Plasmonics: Localized Electron Emission Dynamics from a 60-nm Spot on an Atomically Flat Single-Crystalline Gold Surface
Science Adv. 3, e1700721 (2017)
Frank Meyer zu Heringdorf, Daniel Podbiel, Nicolai Raß, Andreas Makris and Philip Kahl
Spatio-Temporal Imaging of Surface Plasmon Polaritons in Two Photon Photoemission Microscopy
Proc. SPIE 9921, Plasmonics: Design, Materials, Fabrication, Characterization and Applications XIV, 992110 (2016)