Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz 
Spin Dynamics in Magnetic Dielectrics

Chekhov, Alexander L.; Stognij, Alexander I.; Satoh, Takuya; Murzina, Tatiana V.; Razdolski, Ilya; Stupakiewicz, Andrzej

doi:10.1021/acs.nanolett.8b00416

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Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics

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Chekhov, Alexander L.
Department of Physics, Moscow State University;
Faculty of Physics, University of Bialystok;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Razdolski, Ilya
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Chekhov, A. L., Stognij, A. I., Satoh, T., Murzina, T. V., Razdolski, I., & Stupakiewicz, A. (2018). Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics. Nano Letters, 18(5), 2970-2975. doi:10.1021/acs.nanolett.8b00416.

Cite as: https://hdl.handle.net/21.11116/0000-0001-734D-8

Abstract

We report spatial localization of the effective magnetic field generated via the inverse Faraday effect employing surface plasmon polaritons (SPPs) at Au/garnet interface. Analyzing both numerically and analytically the electric field of the SPPs at this interface, we corroborate our study with a proof-of-concept experiment showing efficient SPP-driven excitation of coherent spin precession with 0.41 THz frequency. We argue that the subdiffractional confinement of the SPP electric field enables strong spatial localization of the SPP-mediated excitation of spin dynamics. We demonstrate two orders of magnitude enhancement of the excitation efficiency at the surface plasmon resonance within a 100 nm layer of a dielectric garnet. Our findings broaden the horizons of ultrafast spin-plasmonics and open pathways toward nonthermal opto-magnetic recording on the nanoscale.