二维光子晶体的空气孔形状对负折射平板透镜成像分辨率的影响

Dependence of Image Resolution on the Air Hole Shape for 2D Photonic Crystal Slab Lens

为了研究分辨率与空气孔形状的依赖关系,用时域有限差分(finite-difference time-domain,FDTD)方法对二维光子晶体的折射平板透镜的成像分辨率进行数值模拟,得到成像分辨率随空气孔形状对称性降低而降低,对称性最高的圆孔成像分辨率最高的结果。

The authors analyzed the dependence of resolution of the image formed by this kind of slab lens by using the finitedifference time-domain （FDTD） method. The numerical results show that the subwavelength image resolution can be obtained, and the resolution is of the same order as the crystal constant. It is found that the image resolution depends on the symmetry of the air hole, and the higher symmetry corresponds to the better resolution. The 2D photonic crystal slab lens with circular air hole has best image resolution.