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

被引：40

作者：

Chekhov, Alexander L. ^{[1
,2
,3
]}

Stognij, Alexander, I ^{[4
]}

Satoh, Takuya ^{[5
]}

Murzina, Tatiana, V ^{[1
]}

Razdolski, Ilya ^{[3
]}

Stupakiewicz, Andrzej ^{[2
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

[2] Univ Bialystok, Fac Phys, PL-15245 Bialystok, Poland

[3] Fritz Haber Inst Max Planck Soc, D-14195 Berlin, Germany

[4] NASB, Sci Pract Mat Res Ctr, Minsk 220072, BELARUS

[5] Kyushu Univ, Dept Phys, Fukuoka 8190395, Japan

来源：

NANO LETTERS | 2018年 / 18卷 / 05期

关键词：

Ultrafast spin dynamics; surface plasmon-polariton; inverse Faraday effect; rare-earth iron garnet; nonlinear optics; magnetoplasmonics;

D O I：

10.1021/acs.nanolett.8b00416

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2970 / 2975

页数：6

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