Strong transient magnetic fields induced by THz-driven plasmons in graphene disks

Jeong Woo Han, Pavlo Sai, Dmytro B. But, Ece Uykur, Stephan Winnerl, Gagan Kumar, Matthew L. Chin, Rachael L. Myers-Ward, Matthew T. Dejarld, Kevin M. Daniels, Thomas E. Murphy, Wojciech Knap and Martin Mittendorff ()
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Jeong Woo Han: Universität Duisburg-Essen, Fakultät für Physik
Pavlo Sai: CENTERA Laboratories, Institute of High Pressure Physics PAS
Dmytro B. But: CENTERA Laboratories, Institute of High Pressure Physics PAS
Ece Uykur: Helmholtz-Zentrum Dresden-Rossendorf
Stephan Winnerl: Helmholtz-Zentrum Dresden-Rossendorf
Gagan Kumar: Indian Institute of Technology
Matthew L. Chin: University of Maryland
Rachael L. Myers-Ward: U.S. Naval Research Laboratory
Matthew T. Dejarld: U.S. Naval Research Laboratory
Kevin M. Daniels: University of Maryland
Thomas E. Murphy: University of Maryland
Wojciech Knap: CENTERA Laboratories, Institute of High Pressure Physics PAS
Martin Mittendorff: Universität Duisburg-Essen, Fakultät für Physik

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Strong circularly polarized excitation opens up the possibility to generate and control effective magnetic fields in solid state systems, e.g., via the optical inverse Faraday effect or the phonon inverse Faraday effect. While these effects rely on material properties that can be tailored only to a limited degree, plasmonic resonances can be fully controlled by choosing proper dimensions and carrier concentrations. Plasmon resonances provide new degrees of freedom that can be used to tune or enhance the light-induced magnetic field in engineered metamaterials. Here we employ graphene disks to demonstrate light-induced transient magnetic fields from a plasmonic circular current with extremely high efficiency. The effective magnetic field at the plasmon resonance frequency of the graphene disks (3.5 THz) is evidenced by a strong ( ~ 1°) ultrafast Faraday rotation ( ~ 20 ps). In accordance with reference measurements and simulations, we estimated the strength of the induced magnetic field to be on the order of 0.7 T under a moderate pump fluence of about 440 nJ cm−2.

Date: 2023
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DOI: 10.1038/s41467-023-43412-x

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