圆极化波反射聚焦超表面  

Circularly polarized wave reflection focusing metasurfaces

作　　者：李勇峰[1] 张介秋[1] 屈绍波[1] 王甲富[1] 吴翔[1] 徐卓[2] 张安学[3] 

机构地区：[1]空军工程大学理学院,西安710051 [2]西安交通大学,电子陶瓷与器件教育部重点实验室,西安710049 [3]西安交通大学电子信息工程学院,西安710049

出　　处：《物理学报》2015年第12期147-153,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61331005,11204378,11274389,11304393,61302023);中国博士后科学基金(批准号:2013M532131,2013M532221);陕西省基础研究计划(批准号:2011JQ8031,2013JM6005)资助的课题~~

摘　　要：基于圆极化波入射条件下的高效同极化反射超表面实现了对圆极化反射波相位的自由调控,设计了一维圆极化波反射聚焦超表面.在中心频率f=16 GHz附近,右旋圆极化平面波入射时,反射波聚焦于焦距L=200 mm的实焦点;左旋圆极化波入射时,反射波近似聚焦于焦距L=-200 mm的虚焦点.仿真计算得到聚焦波束的波束宽度、焦深.结果表明,这种圆极化反射聚焦超表面具有很好的聚焦效果,同时具有长焦深和宽带特性.The phase profiles of the reflected circularly polarized waves can be freely manipulated by virtue of a co-polarization reflective metasurface. Based on the co-polarization reflective metasurface, a circularly polarized wave reflection focusing metasurface can be achieved, it can make the reflected waves focus at a focal spot under the normal incidence of circularly polarized plane waves. In this paper, a reflection focusing metasurface is designed. It is found that around the central frequency f = 16 GHz, the reflected waves focus on a focal spot above the metasurface with a focal distance L = 200 mm under the normal incidence of right-handed circularly polarized waves. However, in the case of normal incidence of left-handed circularly waves, the reflected waves focus on an imaginary focal spot below the metasurface with the focal distance L = -200 mm. The beam-width at the focal spot and focal depth are also calculated by using CST Microwave Studio. The simulation results indicate that the beam-width at the focal spot is approximately equal to the operating wavelength. Therefore, the circularly polarized wave reflection focusing metasurface has a good performance for focusing the reflected waves. In addition, the proposed focusing metasurface displays the advantages of the long focal depth and the broad operating bandwidth.

关 键 词：超表面 同极化反射 反射聚焦 焦深 

分 类 号：O485[理学—固体物理]