Luong Hoang Mai, Pham Minh Thien, Nguyen Tho Duc, Zhao Yiping
Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, United States of America.
Nanotechnology. 2019 Oct 18;30(42):425203. doi: 10.1088/1361-6528/ab30b8. Epub 2019 Aug 1.
The magneto-plasmonic properties of Ag-Co composite nano-triangle arrays are investigated. Both plasmonic and magnetic properties of the samples are found to strongly depend on the composition ratio of Ag and Co. Composite nano-triangle arrays exhibit strong plasmonic properties and low magneto-optics (MO) effect with high composition of Ag, and vice versa. The enhanced magneto-optic effect is also observed to be coincident with the localized surface plasmon resonance (LSPR) properties, i.e. the maximum Faraday effect occurs at the LSPR wavelength, which is due to locally high E-field. The composite triangle arrays with the 60% Co content show high plasmonic-MO performances characterized by magneto-optics-plasmonic correlation factor. All experimental results are confirmed by finite-difference time domain calculations.
研究了Ag-Co复合纳米三角形阵列的磁等离子体特性。发现样品的等离子体和磁性特性都强烈依赖于Ag和Co的组成比。当Ag含量高时，复合纳米三角形阵列表现出强等离子体特性和低磁光（MO）效应，反之亦然。还观察到增强的磁光效应与局域表面等离子体共振（LSPR）特性一致，即最大法拉第效应发生在LSPR波长处，这是由于局部高电场所致。Co含量为60%的复合三角形阵列表现出以磁光-等离子体相关因子为特征的高等离子体-MO性能。所有实验结果均通过时域有限差分计算得到证实。
