Gouy phase; carrier-envelope phase; field-emission; plasmonic nanogap; strong-field physics; Carrier-envelope phasis; Monochromatics; Nanogaps; Optical phenomena; Plasmonics; Strong field; Biotechnology; Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
Abstract :
[en] The investigation of optical phenomena in the strong-field regime requires few-cycle laser pulses at field strengths exceeding gigavolts per meter (GV/m). Surprisingly, such conditions can be reached by tightly focusing pJ-level pulses with nearly octave spanning optical bandwidth onto plasmonic nanostructures, exploiting the field-enhancement effect. In this situation, the Gouy phase of the focused beam can deviate significantly from the monochromatic scenario. Here, we study the effect of the Gouy phase of a pulse exploited to drive coherent strong-field photocurrents within a plasmonic gap nanoantenna. While the influence of the specific Gouy phase profile in the experiment approaches the monochromatic case closely, this scheme may be utilized to identify more intricate phase profiles at sub-diffraction scale. Our results pave the way for Gouy phase engineering at picojoule (pJ) pulse energy levels, enabling the optimization of strong-field optical phenomena.
Falk, Matthias; Department of Physics and Center for Applied Photonics, University of Konstanz, Konstanz, Germany
Leitenstorfer, Alfred; Department of Physics and Center for Applied Photonics, University of Konstanz, Konstanz, Germany
BRIDA, Daniele ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
LUDWIG, Markus ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
External co-authors :
yes
Language :
English
Title :
Gouy phase effects on photocurrents in plasmonic nanogaps driven by single-cycle pulses.
European Regional Development Fund Deutsche Forschungsgemeinschaft H2020 European Research Council
Funding text :
Research funding: This research was supported by the European Research Council (819871), the European Regional Development Fund (2017-03-022-19), and the DFG (project ID 425212 (SFB1432)).
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