Cavity enhanced third harmonic generation in graphene
Applied Physics Letters
(C) 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/ licenses/by/4.0/). https://doi.org/10.1063/1.4999054
Graphene displays a surprisingly large third order nonlinearity. Here, we report that conversion efficiencies approaching 10 -4 are possible for third harmonic generation (THG). Moreover, the atomically thin nature of graphene allows for simple integration in cavity designs to increase this even further. We demonstrate a 117-fold enhancement, of resonant vs non-resonant wavelengths in the THG from graphene due to the integration of a graphene layer with a resonant cavity. This large enhancement occurs as the cavity is resonant for both the fundamental field and the third harmonic. We model this effect using the finite difference time domain approach. By compa ring our model with experiment, we are able to deduce the value of a bulk third order susceptibility of graphene of |χ(3)|=4×10-17(m/V)2.
This research was supported by the European Commission (FP7-ICT-2013-613024-GRASP). E.H. and S.H. acknowledge the support of EPSRC fellowship (EP/ K041215/1). At Southampton, this work was funded in part through the Future Photonics Manufacturing Hub (EPSRC EP/N00762X/1).
This is the author accepted manuscript. The final version is available from AIP Publishing via the DOI in this record.
Vol. 112, 011102