Yan Weichao, Nie Zhongquan, Liu Xiaofei, Lan Guoqiang, Zhang Xueru, Wang Yuxiao, Song Yinglin
Opt Express. 2018 Jun 25;26(13):16824-16835. doi: 10.1364/OE.26.016824.
We propose a feasible strategy for firstly constructing diffraction-limited light-induced magnetization spot arrays capable of dynamically controlling transverse polarization orientation of each spot. To achieve this goal, we subtly design a tailored incident light comprised of two sorts of beams and sufficiently demonstrate tit's production through phase modulation of a radially polarized beam. Via tightly focusing counter-propagating composite illuminating beams in a 4π optical microscopic configuration, two orthogonally polarized focal fields with π/2 phase difference between them are formed, inducing a three-dimensional (3D) super-resolved transverse magnetization spot in the magnetic-optical (MO) film. Exploiting the ideal of the multi-zone plate (MZP) filter, we further achieve versatile magnetization spot arrays with controllable in-plane polarization direction in each spot. Such well-defined magnetization behavior is attributed to not merely the coherent interference of vectorial optical waves, but also non-overlapping superposition of localized focal fields. Our achievable outcomes pave the way for practical applications in spintronics and multi-value MO parallelized storage.
我们提出了一种可行的策略，首先构建能够动态控制每个光斑横向偏振方向的衍射极限光致磁化光斑阵列。为实现这一目标，我们巧妙地设计了一种由两种光束组成的定制入射光，并通过径向偏振光束的相位调制充分证明了其产生。通过在4π光学显微镜配置中紧密聚焦反向传播的复合照明光束，形成了两个相互正交偏振且相位差为π/2的焦场，在磁光（MO）薄膜中诱导出三维（3D）超分辨横向磁化光斑。利用多区板（MZP）滤波器的原理，我们进一步实现了每个光斑平面内偏振方向可控的通用磁化光斑阵列。这种明确的磁化行为不仅归因于矢量光波的相干干涉，还归因于局部焦场的非重叠叠加。我们可实现的成果为自旋电子学和多值MO并行存储的实际应用铺平了道路。
