comsol仿真建立一个空间变化的电介质分布，

如可能与超材料被工程。这里，凸透镜形状被定义

通过矩形域的已知变形。电介质分布定义

在未变形的，原始的矩形域和被映射到变形

塑造镜头。虽然这里所限定的透镜的形状是凸的，该介电

分布使入射光束发散。-comsol demonstrates how to set up a spatially varying dielectric distribution,

such as might be engineered with a metamaterial. Here, a convex lens shape is defined

via a known deformation of a rectangular domain. The dielectric distribution is defined

on the undeformed, original rectangular domain and is mapped onto the deformed

shape of the lens. Although the lens shape defined here is convex, the dielectric

distribution causes the incident beam to diverge.