High-Harmonic Generation Enhancement with Graphene Heterostructures

Autor(en)

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

Abstrakt

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(en)

Quantenoptik, Quantennanophysik und Quanteninformation, Forschungsverbund Quantum Aspects of Space Time

Externe Organisation(en)

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

Band

10

Anzahl der Seiten

9

ISSN

2195-1071

DOI

https://doi.org/10.1002/adom.202200715

Publikationsdatum

07-2022

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103021 Optik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f276683e-7099-4c74-be39-054101843131