Jeong Ho-Jin, Kim Dongha, Song Jung-Hwan, Jeong Kwang-Yong, Seo Min-Kyo
Opt Express. 2016 Jul 25;24(15):16904-12. doi: 10.1364/OE.24.016904.
We present a systematic, theoretical investigation of the polar magneto-optical (MO) Kerr effects of a single Ni nanorod in the Mie regime. The MO Kerr rotation, ellipticity, amplitude ratio, and phase shift are calculated as a function of the length and width of the nanorod. The electric field amplitude ratio of the MO Kerr effect is locally maximized when the nanorod supports a plasmonic resonance in the polarization state orthogonal to the incident light. The plasmonic resonances directly induced by the incident light do not enhance the amplitude ratio. In the Mie regime, multiple local maxima of the MO Kerr activity are supported by the resonant modes with different modal characteristics. From the viewpoint of first-order perturbation analysis, the spatial overlap between the incident-light-induced electric field and the Green function determines the local maxima.
我们对处于米氏 regime 的单个镍纳米棒的极化磁光（MO）克尔效应进行了系统的理论研究。计算了 MO 克尔旋转、椭圆率、振幅比和相移作为纳米棒长度和宽度的函数。当纳米棒在与入射光正交的偏振态下支持等离子体共振时，MO 克尔效应的电场振幅比局部最大化。由入射光直接诱导的等离子体共振不会增强振幅比。在米氏 regime 中，具有不同模态特征的共振模式支持 MO 克尔活性的多个局部最大值。从一阶微扰分析的角度来看，入射光诱导的电场与格林函数之间的空间重叠决定了局部最大值。
