Zhu Yanlin, Li Shulei, Zhang Yang, Meng Jinjing, Tan Xu, Chen Jingdong, Panmai Mingcheng, Xiang Jin
Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China.
School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China.
Nanophotonics. 2024 Jul 1;13(20):3815-3823. doi: 10.1515/nanoph-2024-0154. eCollection 2024 Aug.
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.
米氏纳米结构中电偶极子和磁偶极子之间的干涉已被广泛证明可用于调整散射场，这在光学纳米天线、滤波器和路由器中普遍使用。基于介电纳米结构的散射场动态控制对于基础研究很有趣，对于实际应用也很重要。在此，理论表明通过激光诱导的金属-绝缘体转变可以操纵二氧化钒纳米球中诱导的电偶极子和磁偶极子的幅度，并且实验证明通过简单改变激发激光的辐照度可以控制定向散射。作为一个直接应用，我们展示了一种可见光波段的高性能光调制器，它具有高调制深度、快速调制速度以及源于具有准第一克尔条件的后向散射设置的高重现性。我们的方法表明了在开发纳米级光学天线和光调制器件方面的潜在应用。
