代码适用于Matlab模拟的电磁学时域有限差分法（FDTD）。代码开发建立在Matlab程序语言基础上，因为Matlab程序易于使用、实用性强，并且大多电子工程师对Matlab 语言较为熟悉。(The code is applicable to the electromagnetics time domain finite difference method (FDTD) for Matlab simulation. Code development is based on Matlab pr

平面上排布不同旋转角的纳米天线产生不同几何相位调制用生成涡旋光(The vortex is generated by the different geometric phase modulation of the nanometer antenna with different rotation angles arranged on the plane)