de Sousa N, Froufe-Pérez L S, Sáenz J J, García-Martín A
Departamento de Física de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049, Madrid, Spain.
Donostia International Physics Center (DIPC), P. Manuel de Lardizabal 4, Donostia-San Sebastián 20018, Spain.
Sci Rep. 2016 Aug 4;6:30803. doi: 10.1038/srep30803.
The magneto-optical activity, namely the polarization conversion capabilities of high-index, non-absorbing, core-shell dielectric nanospheres is theoretically analyzed. We show that, in analogy with their plasmonic counterparts, the polarization conversion in resonant dielectric particles is linked to the amount of electromagnetic field probing the magneto-optical material in the system. However, in strong contrast with plasmon nanoparticles, due to the peculiar distribution of the internal fields in resonant dielectric spheres, the magneto-optical response is fully governed by the magnetic (dipolar and quadrupolar) resonances with little effect of the electric ones.
对高折射率、非吸收性核壳介电纳米球的磁光活性，即其偏振转换能力进行了理论分析。我们表明，与它们的等离子体对应物类似，共振介电粒子中的偏振转换与系统中探测磁光材料的电磁场量有关。然而，与等离子体纳米粒子形成强烈对比的是，由于共振介电球内部场的特殊分布，磁光响应完全由磁（偶极和四极）共振主导，而电共振的影响很小。
