%0 Journal Article
%T Giant enhancement of third-harmonic generation in graphene–metal heterostructures
%+ University of Vienna [Vienna]
%+ Institut de Ciencies Fotoniques [Castelldefels] (ICFO)
%+ University of Southern Denmark (SDU)
%+ Laboratoire Charles Coulomb (L2C)
%+ MIT
%+ ICFO
%A Alonso Calafell, Irati
%A Rozema, Lee A.
%A Alcaraz Iranzo, David
%A Trenti, Alessandro
%A Jenke, Philipp K.
%A Cox, Joel D.
%A Kumar, Avinash
%A Bieliaiev, Hlib
%A Nanot, Sébastien
%A Peng, Cheng
%A Efetov, Dmitri K.
%A Hong, Jin-Yong
%A Kong, Jing
%A Englund, Dirk R.
%A García de Abajo, F. Javier
%A Koppens, Frank H. L.
%A Walther, Philip
%< avec comité de lecture
%Z L2C:20-177
%@ 1748-3387
%J Nature Nanotechnology
%I Nature Publishing Group
%P https://doi.org/10.1038/s41565-020-00808-w
%8 2020-12-14
%D 2020
%Z 2205.12720
%R 10.1038/s41565-020-00808-w
%Z Engineering Sciences [physics]/Optics / Photonic
%Z Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Journal articles
%X Nonlinear nanophotonics leverages engineered nanostructures to funnel light into small volumes and intensify nonlinear optical processes with spectral and spatial control. Owing to its intrinsically large and electrically tunable nonlinear optical response, graphene is an especially promising nanomaterial for nonlinear optoelectronic applications. Here we report on exceptionally strong optical nonlinearities in graphene–insulator–metal heterostructures, which demonstrate an enhancement by three orders of magnitude in the third-harmonic signal compared with that of bare graphene. Furthermore, by increasing the graphene Fermi energy through an external gate voltage, we find that graphene plasmons mediate the optical nonlinearity and modify the third-harmonic signal. Our findings show that graphene–insulator–metal is a promising heterostructure for optically controlled and electrically tunable nano-optoelectronic components.
%G English
%L hal-03094954
%U https://hal.science/hal-03094954
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021