Optical Third-Harmonic Generation in Graphene
Open Access
- 10 June 2013
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review X
- Vol. 3 (2), 021014
- https://doi.org/10.1103/physrevx.3.021014
Abstract
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 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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Funding Information
- U.S. Department of Energy
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