Journal
PHYSICAL REVIEW X
Volume 3, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.3.021014
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Funding
- AFOSR MURI [FA9550-09-1-0705]
- Center for Redefining Photovoltaic Efficiency through Molecular-Scale Control, an Energy Frontier Research Center
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
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We report strong third-harmonic generation in monolayer graphene grown by chemical vapor deposition and transferred to an amorphous silica (glass) substrate; the photon energy is in three-photon resonance with the exciton-shifted van Hove singularity at the M point of graphene. The polarization selection rules are derived and experimentally verified. In addition, our polarization-and azimuthal-rotation-dependent third-harmonic-generation measurements reveal in-plane isotropy as well as anisotropy between the in-plane and out-of-plane nonlinear optical responses of graphene. Since the third-harmonic signal exceeds that from bulk glass by more than 2 orders of magnitude, the signal contrast permits background-free scanning of graphene and provides insight into the structural properties of graphene.
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