High‐Harmonic Generation Enhancement with Graphene Heterostructures
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Plasmonic and Surface Plasmon Research · Graphene research and applications · Advanced Fiber Laser Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Vienna Faculty of Physics Vienna Center for Quantum Science and Technology (VCQ) Vienna 1090 Austria
AIT Austrian Institute of Technology Center for Digital Safety & Security Vienna Austria
Department of Physics and Astronomy University of Exeter Exeter EX4 4QL UK
ICFO‐Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 Spain
ICREA‐Institució Catalana de Recerca i Estudis Avançats Passeig Lluís Companys 23 Barcelona 08010 Spain
Christian Doppler Laboratory for Photonic Quantum Computer, Faculty of Physics University of Vienna Boltzmanngasse Vienna 1090 Austria
Research Platform for Testing the Quantum and Gravity Interface (TURIS) University of Vienna Vienna 1090 Austria
Funding
European Research Council · Fundación Cellex
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