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.File | Dimensione | Formato | |
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