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Proceedings Paper

Ultrafast light-induced magnetism and non-reciprocity in plasmonic Au nanoparticles (Conference Presentation)
Author(s): Matthew T. Sheldon

Paper Abstract

We report the first experimental quantification of optically induced magnetization in plasmonic Au nanoparticles due to the inverse Faraday effect (IFE). The induced magnetic moment is large under typical ultrafast pulse excitation and can easily exceed the magnetic moment in comparably sized magnetic nanoparticles by more than order of magnitude. Furthermore, the magnetization and demagnetization kinetics are instantaneous within a sub-picosecond timescale, supporting a mechanism of coherent transfer of angular momentum from the optical field to the electron gas. Our results open the door to all-optical sub-wavelength strategies for optical isolation that do not require externally applied magnetic fields.

Paper Details

Date Published: 9 March 2020
Proc. SPIE 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII, 112841P (9 March 2020); doi: 10.1117/12.2551182
Show Author Affiliations
Matthew T. Sheldon, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 11284:
Smart Photonic and Optoelectronic Integrated Circuits XXII
Sailing He; Laurent Vivien, Editor(s)

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