Third harmonic generation from graphene lying on different substrates: Optical-phonon resonances and interference effects

Abstract

Graphene is a nonlinear material which can be used as a saturable absorber, frequency mixer and frequency multiplier. We investigate the third harmonic generation from graphene lying on different substrates, consisting of a dielectric (dispersionless or polar), metalized or non-metalized on the back side. We show that the third harmonic intensity emitted from graphene lying on a substrate, can be increased by orders of magnitude as compared to the isolated graphene, due the LO-phonon resonances in a polar dielectric or due to the interference effects in the substrates metalized on the back side. In some frequency intervals, the presence of the polar dielectric substrate compensates the strongly decreasing with $\omega$ frequency dependence of the third-order conductivity of graphene making the response almost frequency independent.

15 pages, 13 figures

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• Anomalous Non-linear Optical Response Of Graphene Near Phonon Resonances
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• Nonlinear optics of graphene and other 2D materials in layered structures
• Influence of optical nonlinearities on plasma waves in graphene
• Spatio-temporal Modulation Instability of Surface Plasmon Polaritons in Graphene-dielectric Heterostructure
• Third-order Optical Nonlinearity in Two-dimensional Transition Metal Dichalcogenides
• Nonperturbative quasiclassical theory of graphene photoconductivity