Interference between the electric and magnetic dipole-induced in Mie nanostructures has been widely demonstrated to tailor the scattering field, which was commonly used in optical nano-antennas, filters, and routers. The dynamic control of scattering fields based on dielectric nanostructures is interesting for fundamental research and important for practical applications. Here, it is shown theoretically that the amplitude of the electric and magnetic dipoles induced in a vanadium dioxide nanosphere can be manipulated by using laser-induced metal-insulator transitions, and it is experimentally demonstrated that the directional scattering can be controlled by simply varying the irradiances of the excitation laser. As a straightforward application, we demonstrate a high-performance optical modulator in the visible band with high modulation depth, fast modulation speed, and high reproducibility arising from a backscattering setup with the quasi-first Kerker condition. Our method indicates the potential applications in developing nanoscale optical antennas and optical modulation devices.

中文翻译：

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激光诱导金属绝缘体跃迁动态控制单个米氏粒子的定向散射


米氏纳米结构中产生的电偶极子和磁偶极子之间的干扰已被广泛证明可以调整散射场，这通常用于光学纳米天线、滤波器和路由器。基于介电纳米结构的散射场的动态控制对于基础研究来说很有趣，对于实际应用也很重要。这里，理论上表明，二氧化钒纳米球中感应的电偶极子和磁偶极子的振幅可以通过使用激光诱导的金属-绝缘体跃迁来控制，并且实验证明，可以通过简单地改变激发激光的辐照度。作为一个简单的应用，我们展示了可见光波段的高性能光调制器，具有高调制深度、快速调制速度以及由具有准第一 Kerker 条件的反向散射设置产生的高再现性。我们的方法表明了开发纳米级光学天线和光学调制器件的潜在应用。