Anomalous Nonlinear Optical Response of Graphene Near Phonon Resonances

作者：Lafeta Lucas; Cadore Alisson R; Mendes de Sa Thiago G; Watanabe Kenji; Taniguchi Takashi; Campos Leonardo C; Jorio Ado; Malard Leandro M^*

来源：Nano Letters, 2017, 17(6): 3447-3451.

DOI：10.1021/acs.nanolett.7b00329

• Nonlinear optics
• graphene
• hexagonal boron nitrtide
• four-wave mixing

In this work we probe the third-order nonlinear optical property of graphene and hexagonal boron nitride and their heterostructure by the use of coherent anti-Stokes Raman spectroscopy. When the energy difference of the two input fields matches the phonon energy, the anti-Stokes emission intensity is enhanced in h-BN, as usually expected, while for graphene an anomalous decrease is observed. This behavior can be understood in terms of a coupling between the electronic continuum and a discrete phonon state. We have also measured a graphene/h-BN heterostructure and demonstrate that the anomalous effect in graphene dominates the heterostructure nonlinear optical response.

• 出版日期2017-6