Nonlinear photoluminescence from graphene

ORAL

Abstract

Upon femtosecond laser irradiation, a bright, broadband nonlinear photoluminescence (PL) is observed from graphene at frequencies well above the excitation frequency. Analyses show that it arises from radiative recombination of a broad distribution of non-equilibrium electrons and holes, generated by rapid scattering between photo-excited carriers within tens of femtoseconds after the optical excitation. Its highly unusual characteristics come from the unique electronic and structural properties of graphene.

*W. L. and F. W. acknowledge support from MURI-ONR and a Sloan fellowship. The experiment was performed at the Molecular Foundry of the Lawrence Berkeley National Laboratory supported by the DOE under Contract No. DE-AC02-05CH11231.

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Authors

  • Weitao Liu

    • Physics Department, University of California at Berkeley, CA 94720

  • S. W. Wu

    • The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

  • P. J. Schuck

    • The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

  • M. Salmeron

    • The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

  • Y. R. Shen

    • Physics Department, University of California at Berkeley, CA 94720

  • F. Wang

    • Physics Department, University of California at Berkeley, CA 94720