Opt Lett. 2018 Jul 15;43(14):3393-3396. doi: 10.1364/OL.43.003393.
Study of photonic spin-orbital interactions, which involves control of the propagation and spatial distributions of light via its polarization, is not only important at the fundamental level but also has significant implications for functional photonic applications that require active tuning of directional light propagation. Many of the experimental demonstrations have been attributed to the spin-momentum locking characteristic of evanescent waves. In this Letter, we show another property of evanescent waves: the polarization-dependent direction of the imaginary part of the Poynting vector, i.e., reactive power. Based on this property, we propose a simple and robust way to tune the directional far-field scattering from nanoparticles near a surface under evanescent wave illumination by controlling its polarization and direction of the incident light.
光子自旋轨道相互作用的研究，涉及通过其偏振控制光的传播和空间分布，不仅在基础层面上很重要，而且对于需要主动调定向光传播的功能光子应用也具有重要意义。许多实验演示归因于消逝波的自旋动量锁定特性。在这篇快报中，我们展示了消逝波的另一个特性：即庞加莱矢量虚部的偏振相关方向，也就是无功功率。基于这一特性，我们提出了一种简单而稳健的方法，通过控制入射光的偏振和方向，来调谐近表面纳米粒子在消逝波照明下的远场散射的方向。
