Anomalous Non-linear Optical Response Of Graphene Near Phonon Resonances

Abstract

In this work we probe the third-order non-linear optical property of graphene, hexagonal boron nitride and their heterostructure by the use of coherent anti-Stokes Raman Spectroscopy. When the energy difference of the two input fields match the phonon energy, the anti-Stokes emission intensity is enhanced in h-BN, as usually expected while for graphene a anomalous decrease is observed. This behaviour can be understood in terms of q 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 optical response.

5 pages, 3 figures

References in corpus (3)

• Two-Dimensional Material Nanophotonics
• Hunting for Monolayer Boron Nitride: Optical and Raman Signatures
• Third harmonic generation from graphene lying on different substrates: Optical-phonon resonances and interference effects

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