Plasmonic nanocathodes offer unique opportunities for optically driving, switching, and steering femtosecond photocurrents in nanoelectronic devices and pulsed electron sources. This paper directly characterizes multiphoton photoemission from plasmonic gold nanostars and demonstrates all-optical control over these currents. Angular control is achieved by selectively exciting different tips on single nanostars via laser frequency or linear polarization, rotating the tip-aligned directional photoemission. Classical plasmonic field simulations combined with quantum photoemission theory elucidate the mechanism for femtosecond spatiotemporal current control.
Publisher
Nature Communications
Published On
Mar 13, 2020
Authors
Jacob Pettine, Priscilla Choo, Fabio Medeghini, Teri W. Odom, David J. Nesbitt
Tags
plasmonic nanocathodes
femtosecond photocurrents
nanoelectronic devices
multiphoton photoemission
angular control
photoemission theory
plasmons
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