Hot electrons dominate the ultrafast (∼fs-ps) optical and electronic properties of metals and semi-conductors and they are exploited in a variety of applications including photovoltaics and photode-tection. We perform power-dependent third harmonic generation measurements on gated single-layergraphene and detect a significant deviation from the cubic power-law expected for a third harmonicgeneration process. We assign this to the presence of hot electrons. Our results indicate that theperformance of nonlinear photonic devices based on graphene, such as optical modulators and fre-quency converters, can be affected by changes in the electronic temperature, which might occur dueto increase of absorbed optical power or Joule heating.

Hot electrons modulation of third-harmonic generation in graphene

A. Tomadin;M. Polini;
2019-01-01

Abstract

Hot electrons dominate the ultrafast (∼fs-ps) optical and electronic properties of metals and semi-conductors and they are exploited in a variety of applications including photovoltaics and photode-tection. We perform power-dependent third harmonic generation measurements on gated single-layergraphene and detect a significant deviation from the cubic power-law expected for a third harmonicgeneration process. We assign this to the presence of hot electrons. Our results indicate that theperformance of nonlinear photonic devices based on graphene, such as optical modulators and fre-quency converters, can be affected by changes in the electronic temperature, which might occur dueto increase of absorbed optical power or Joule heating.
2019
Soavi, G.; Wang, G.; Rostami, H.; Tomadin, A.; Balci, O.; Paradeisanos, I.; Pogna, E.; Cerullo, G.; Lidorikis, E.; Polini, M.; Ferrari, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1032492
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