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Tracing the dynamics of strong-field photoemission currents in plasmonic gaps

AuthorsAguirregabiria, Garikoitz; Marinica, Dana Codruta; Ludwig, M.; Brida, Daniele; Leitenstorfer, A.; Aizpurua, Javier ; Borisov, Andrei G.
Issue Date2018
CitationCEN 2018
AbstractThe ability of plasmonic resonances to strongly localize and enhance electromagnetic fields at the surface of metallic nanoparticles can be utilized to produce strong-field photoemitted electrons. If two plasmonic nanoparticles are separated by a small gap, the photoemitted electrons create femtosecond currents between the nanoparticles, which can be controlled by varying the Carrier-Envelope Phase (CEP) of a single optical-cycle light pulse. Due to the strongly decaying electric near-fields around plasmonic nanoparticles, in single particle configurations, photoemitted electrons follow a straight trajectory and do not present quiver motion however, a much richer electron dynamics is produced when the emission of electrons occurs in a plasmonic gap. Using Time Dependent Density Functional Theory (TDDFT) we theoretically investigate the photo-induced currents across the gap between two cylindrical nanoparticles as a response to a single-cycle optical pulse. Contrary to the single nanoparticle case, the electric field in the gap region does not decay abruptly along the dimer axis. We demonstrate that in such scenario, the photoemitted electrons experience quiver motion that responds to the complex structure of the fields induced in the gap. This effect is compared to the case where no quiver motion is produced i.e., when the maximum current occurs for a perfect cosine-like optical pulse (CEP=0). We find that the quiver motion results in a shift of the CEP at which the maximum current is observed. Tracing and dissecting an ultrashort photocurrent in a plasmonic nanogap as shown here is relevant for the proper design of integrated optoelectronic devices that operate in the single-electron regime.
DescriptionResumen del trabajo presentado a la Spanish Conference on Nanophotonics (Conferencia Española de Nanofotónica-CEN), celebrada en Donostia-San Sebastián (España) del 3 al 5 de octubre de 2018.
Appears in Collections:(CFM) Comunicaciones congresos
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