二维金属矩形光栅的偏振控制及其透射特性

Arbitrary Polarization Transformation Based on Two-Dimensional Metallic Rectangular Gratings

基于一维亚波长金属光栅结构的双折射效应,将等效介质理论(EMT)推广到二维亚波长结构,对一种特定的金属矩形光栅结构进行了分析,实现输入线偏振到输出任意偏振态的控制。利用时域有限差分(FDTD)算法对输出光偏振态及其透射特性进行了仿真。仿真结果表明:通过空间角调制的方法,得到输出光的偏振态理论上可实现全庞加莱球覆盖,并具有较高的透射率。

Based on the birefringence effect of one-dimensional subwavelength metallic grating and equivalent medium theory （EMT） is generalize to a two-dimensional subwavelength structure to analyze a two-dimensional metallic rectangular gratings in order to realize the control of polarized state from incidnet linear polarization to output arbitrary polarized state transformation. Finite difference time domain （FDTD） algorithm is performed to analyze properties of polarization and transmittance of the light. Simulation results show that the full Poincaré sphere coverage could be obtained theoretically by space angle modulation, and the high transmittance can be achieved as well.