Broadband, electrically tuneable, third harmonic generation in graphene
Abstract
Optical harmonic generation occurs when high intensity light (W/m) interacts with a nonlinear material. Electrical control of the nonlinear optical response enables applications such as gate-tunable switches and frequency converters. Graphene displays exceptionally strong-light matter interaction and electrically and broadband tunable third order nonlinear susceptibility. Here we show that the third harmonic generation efficiency in graphene can be tuned by over two orders of magnitude by controlling the Fermi energy and the incident photon energy. This is due to logarithmic resonances in the imaginary part of the nonlinear conductivity arising from multi-photon transitions. Thanks to the linear dispersion of the massless Dirac fermions, ultrabroadband electrical tunability can be achieved, paving the way to electrically-tuneable broadband frequency converters for applications in optical communications and signal processing.
Cite
@article{arxiv.1710.03694,
title = {Broadband, electrically tuneable, third harmonic generation in graphene},
author = {G. Soavi and G. Wang and H. Rostami and D. Purdie and D. De Fazio and T. Ma and B. Luo and J. Wang and A. K. Ott and D. Yoon and S. Bourelle and J. E. Muench and I. Goykhman and S. Dal Conte and M. Celebrano and A. Tomadin and M. Polini and G. Cerullo and A. C. Ferrari},
journal= {arXiv preprint arXiv:1710.03694},
year = {2018}
}