Ultrafast light-induced magnetism and non-reciprocity in plasmonic Au nanoparticles (Conference Presentation)

Matthew T. Sheldon

doi:10.1117/12.2551182

9 March 2020 Ultrafast light-induced magnetism and non-reciprocity in plasmonic Au nanoparticles (Conference Presentation)

Matthew T. Sheldon

Author Affiliations +

Proceedings Volume 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII; 112841P (2020) https://doi.org/10.1117/12.2551182
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Matthew T. Sheldon "Ultrafast light-induced magnetism and non-reciprocity in plasmonic Au nanoparticles (Conference Presentation)", Proc. SPIE 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII, 112841P (9 March 2020); https://doi.org/10.1117/12.2551182

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