Fluorescence of laser-created electron-hole plasma in graphene

Abstract

We present an experimental observation of non-linear up- and down-converted\noptical luminescence of graphene and thin graphite subject to picosecond\ninfrared laser pulses. We show that the excitation yields to a high density\nelectron-hole plasma in graphene. It is further shown that the excited charge\ncarries can efficiently exchange energy due to scattering in momentum space.\nThe recombination of the resulting non-equilibrium electron-hole pairs yields\nto the observed white light luminescence. Due to the scattering mechanism the\npower dependence of the luminescence is quadratic until it saturates for higher\nlaser power. Studying the luminescence intensity as a function of layer\nthickness gives further insight into its nature and provides a new tool for\nsubstrate independent thickness determination of multilayer flakes.\n

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Affiliated Institutions

• University of Würzburg DE
• Bavarian Center for Applied Energy Research DE
• University of Stuttgart DE

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