Anomalous non-linear optical response of graphene near phonon resonances
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Universidade Federal de Minas Gerais
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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.
Abstract
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Ótica não-linear, Grafeno
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Nonlinear optics, Graphene, Hexagonal boron nitride, Four-wave mixing
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https://pubs.acs.org/doi/10.1021/acs.nanolett.7b00329