Magneto-optic Kerr effect (MOKE) enhancement is studied for Yttrium Iron Garnet (YIG) nanoparticle. The MOKE is quantified by the ratio of the polarization components of reflected wave, namely between the perpendicular component to the parallel component with respect to the polarization of the incident wave. Thus, the enhancement of MOKE can be obtained by increasing the perpendicular component or reducing the parallel component of the reflected wave polarization. An FDTD calculation is performed to obtain the scattered field. Projecting the resulting scattered field to the vector spherical harmonic basis, we show through multipole moments analysis that the suppression of backscattering non-MO field and the raise of the backscattered MO field can be achieved by subtle superposition of some optical modes. For the specific YIG particle system and the wavelength range chosen, the result shows that enhancement of MOKE up to 7.5[Formula: see text]mrad can be achieved.

中文翻译：

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通过后向散射抑制增强 YIG 纳米粒子的磁光克尔效应

研究了钇铁石榴石 (YIG) 纳米粒子的磁光克尔效应 (MOKE) 增强。MOKE是通过反射波的偏振分量的比率来量化的，即相对于入射波的偏振的垂直分量与平行分量之间的比率。因此，可以通过增加反射波偏振的垂直分量或减少平行分量来获得 MOKE 的增强。执行 FDTD 计算以获得散射场。将产生的散射场投影到矢量球谐基上，通过多极矩分析表明，可以通过一些光学模式的细微叠加来实现对后向散射非MO场的抑制和后向散射MO场的提高。