光子晶体分为简单光子晶体和复式光子晶体，激光全息法是制作复式光子晶体的重要方法之一，光束偏振在其中扮演着重要角色。利用具有一定对称性的四光束配置干涉产生复式光子晶体，通过Matlab编程进行数值仿真，系统研究了不同偏振组合 (包括单光束、双光束、三光束和四光束) 对复式光子晶体元胞形状及干涉对比度的影响。结果表明，各光束的偏振度及旋转角度均对复式光子晶体具有显著影响。在不同偏振条件下获得了一系列丰富的元胞形状，如波浪条纹、椭圆柱、锯齿状等。此外，发现当各光束均为线偏振光时具有最佳的干涉对比度。上述研究结果对制作特殊元胞的复式光子晶体和虚拟实验教学具有一定的理论指导意义。

We present a discovery of an unusual unidirectionally rotating windmill scattering of electromagnetic waves by a magnetized gyromagnetic cylinder via an analytical theory for rigorous solution to fields and charges and an understanding of the underlying mathematical and physical mechanisms. Mathematically, the generation of nonzero off-diagonal components can break the symmetry of forward and backward scattering coefficients, producing unidirectional windmill scattering. Physically, this windmill scattering originates from the nonreciprocal unidirectional rotation of polarized magnetic charges on the surface of a magnetized gyromagnetic cylinder, which drives the scattering field to radiate outward in the radial direction and unidirectionally emit in the tangential direction. Interestingly, the unidirectional electromagnetic windmill scattering is insensitive to the excitation direction. Moreover, we also discuss the size dependence of unidirectional windmill scattering by calculating the scattering spectra of the gyromagnetic cylinder. These results are helpful for exploring and understanding novel interactions between electromagnetic waves and gyromagnetic materials or structures and offer deep insights for comprehending topological photonic states in gyromagnetic systems from the aspect of fundamental classical electrodynamics and electromagnetics.

超透镜是一种由二维亚波长阵列结构表面所设计的透镜，其对光场中振幅、相位和偏振的调控能力较灵活，同时具有低损耗、易集成、超轻薄等优点，近些年引起了科研人员广泛的研究兴趣。然而在大多数情况下，针对特定波长设计的超透镜会遭受较大的色差，从而限制了其在多波长或宽带应用中的成像作用。超透镜因其二维平面结构引入了新的自由度，在对色差的消除上体现了新的潜力。文中报道了多种不同的消色差超透镜设计及其消色差调控机理，并对现有的消色差超透镜从调制波段类型进行了分类，如对离散波长的和对连续波长的消色差超表面透镜，后者又可从工作模式上分类为透射型和反射型，最后介绍了超透镜阵列在成像上的应用以及其在大景深宽带消色差器件上的前景。