Imaging the Nonlinear Plasmoemission Dynamics of Electrons from Strong Plasmonic Fields
Daniel Podbiel, Philip Kahl, Andreas Makris, Bettina Frank, Simon Sindermann, Timothy J Davis, Harald Giessen, Michael Horn-von Hoegen, Frank-J Meyer Zu Heringdorf
NANO LETTERS | AMER CHEMICAL SOC | Published : 2017
We use subcycle time-resolved photoemission microscopy to unambiguously distinguish optically triggered electron emission (photoemission) from effects caused purely by the plasmonic field (termed "plasmoemission"). We find from time-resolved imaging that nonlinear plasmoemission is dominated by the transverse plasmon field component by utilizing a transient standing wave from two counter-propagating plasmon pulses of opposite transverse spin. From plasmonic foci on flat metal surfaces, we observe highly nonlinear plasmoemission up to the fifth power of intensity and quantized energy transfer, which reflects the quantum-mechanical nature of surface plasmons. Our work constitutes the basis for..View full abstract
Awarded by Deutsche Forschungsgemeinschaft
Financial support from the Deutsche Forschungsgemeinschaft through SFB 616 "Energy Dissipation at Surfaces", SPP 1391 "Ultrafast Nanooptics", and CRC 1242 "Non-Equilibrium Dynamics of Condensed Matter in the Time Domain" as well as ERC (Complexplas), BMBF, Zeiss-Stiftung, and BW Stiftung is gratefully acknowledged. T.J.D. gratefully acknowledges support from University of Stuttgart and Max-Planck-Institute for Solid State Research.