Maccaferri Nicolò, González-Díaz Juan B, Bonetti Stefano, Berger Andreas, Kataja Mikko, van Dijken Sebastiaan, Nogués Josep, Bonanni Valentina, Pirzadeh Zhaleh, Dmitriev Alexandre, Åkerman Johan, Vavassori Paolo
Nanomagnetism Group, CIC nanoGUNE Consolider, 20018 Donostia-San Sebastián, Spain.
Opt Express. 2013 Apr 22;21(8):9875-89. doi: 10.1364/OE.21.009875.
An approach to compute the polarizability tensor of magnetic nanoparticles having general ellipsoidal shape is presented. We find a surprisingly excellent quantitative agreement between calculated and experimental magneto-optical spectra measured in the polar Kerr configuration from nickel nanodisks of large size (exceeding 100 nm) with circular and elliptical shape. In spite of its approximations and simplicity, the formalism presented here captures the essential physics of the interplay between magneto-optical activity and the plasmonic resonance of the individual particle. The results highlight the key role of the dynamic depolarization effects to account for the magneto-optical properties of plasmonic nanostructures.
本文提出了一种计算具有一般椭球形状的磁性纳米颗粒极化率张量的方法。我们发现，对于从具有圆形和椭圆形的大尺寸（超过100 nm）镍纳米盘在极克尔配置下测量的计算磁光光谱与实验磁光光谱之间，存在惊人的良好定量一致性。尽管这里提出的形式体系有近似性和简单性，但它捕捉到了磁光活性与单个粒子的等离子体共振之间相互作用的基本物理原理。结果突出了动态去极化效应在解释等离子体纳米结构的磁光特性方面的关键作用。
