LOZAN, Olga; SUNDARARAMAN, Ravishankar; EA-KIM, Buntha; RAMPNOUX, Jean-Michel; NARANG, Prineha; DILHAIRE, Stefan; LALANNE, Philippe

doi:10.1038/s41467-017-01802-y

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LOZAN, Olga
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

SUNDARARAMAN, Ravishankar
Department of Materials Science and Engineering [RPI-Troy]

EA-KIM, Buntha
Laboratoire Charles Fabry / Services Généraux Techniques

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Ce document a été publié dans

Nature Communications. 2017, vol. 8, n° 1, p. 1656

Nature Publishing Group

Résumé en anglais

Decay of plasmons to hot carriers has recently attracted considerable interest for fundamental studies and applications in quantum plasmonics. Although plasmon-assisted hot carriers in metals have already enabled remarkable physical and chemical phenomena, much remains to be understood to engineer devices. Here, we present an analysis of the spatio-temporal dynamics of hot electrons in an emblematic plasmonic device, the adiabatic nanofocusing surface-plasmon taper. With femtosecond-resolution measurements, we confirm the extraordinary capability of plasmonic tapers to generate hot carriers by slowing down plasmons at the taper apex. The measurements also evidence a substantial increase of the " lifetime " of the electron gas temperature at the apex. This interesting effect is interpreted as resulting from an intricate heat flow at the apex. The ability to harness the " lifetime " of hot-carrier gases with nanoscale circuits may provide a multitude of applications, such as hot-spot management, nonequilibrium hot-carrier generation, sensing, and photovoltaics.< Réduire

DOI

http://dx.doi.org/10.1038/s41467-017-01802-y

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798