Increased rise time of electron temperature during adiabatic plasmon focusing

Abstract : 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.
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Nature Communications, Nature Publishing Group, 2017, 8 (1), pp.1656. 〈10.1038/s41467-017-01802-y〉
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Olga Lozan, Ravishankar Sundararaman, Buntha Ea-Kim, Jean-Michel Rampnoux, Prineha Narang, et al.. Increased rise time of electron temperature during adiabatic plasmon focusing. Nature Communications, Nature Publishing Group, 2017, 8 (1), pp.1656. 〈10.1038/s41467-017-01802-y〉. 〈hal-01662427〉

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