High-Harmonic Generation Enhancement with Graphene Heterostructures

Author(s)
Irati Alonso Calafell, Lee A. Rozema, Alessandro Trenti, Justus Bohn, Eduardo J. C. Dias, Philipp K. Jenke, Kishan S. Menghrajani, David Alcaraz Iranzo, F. Javier Garcia de Abajo, Frank H. L. Koppens, Euan Hendry, Philip Walther
Abstract

High-harmonic generation (HHG) in graphene heterostructures, consisting of metallic nanoribbons separated from a graphene sheet by either a few-nanometer layer of aluminum oxide or an atomic monolayer of hexagonal boron nitride, is investigated. The nanoribbons amplify the near-field at the graphene layer relative to the externally applied pumping, thus allowing the observation of third- and fifth-harmonic generation in the carbon monolayer at modest pump powers in the mid-infrared. The dependence of the nonlinear signals on the ribbon width and spacer thickness, as well as pump power and polarization are studied, and enhancement factors (EF) relative to bare graphene reaching 1600 and 4100 for third- and fifth-harmonic generation, respectively, are demonstrated. The work supports the use of graphene heterostructures to selectively enhance specific nonlinear processes of interest, an essential capability for the design of nanoscale nonlinear devices.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information, Research Network Quantum Aspects of Space Time
External organisation(s)
Vienna Center for Quantum Science and Technology (VCQ), Austrian Institute of Technology, University of Exeter, Barcelona Institute of Science & Technology, Institució Catalana de Recerca i Estudis Avançats (ICREA), The Institute of Photonic Sciences
Journal
Advanced Optical Materials
Volume
10
No. of pages
9
ISSN
2195-1071
DOI
https://doi.org/10.1002/adom.202200715
Publication date
07-2022
Peer reviewed
Yes
Austrian Fields of Science 2012
103015 Condensed matter, 103021 Optics
Keywords
ASJC Scopus subject areas
Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics
Portal url
https://ucrisportal.univie.ac.at/en/publications/highharmonic-generation-enhancement-with-graphene-heterostructures(f276683e-7099-4c74-be39-054101843131).html