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为了验证异向媒质(LHM)对倏逝波的恢复作用,提出了一种借助矩形波导的新型仿真模型.在由相位跟踪测量方法得到LHM折射率近似为1的工作频率下,该仿真模型研究了倏逝波通过人工LHM的传输特性,并用有限计算域内的三维时域有限差分FDTD技术对人工异向媒质进行了仿真,获得了倏逝波电场在空波导中的幅度分布.同时讨论了异向媒质电磁参数与理想完美透镜条件的偏差对异向介质对倏逝波恢复作用的影响.仿真结果表明,异向媒质对倏逝波的幅度具有部分恢复作用.该仿真模型可以在有限计算域内单独对倏逝波的性质进行研究,可以应用于验证异向介质对倏逝波作用的实验.
In order to verify the effect of LHM on the recovery of evanescent waves, a new simulation model based on rectangular waveguides is proposed.When the operating frequency of the LHM is approximated to 1 by the phase tracking method, the simulation model The transmission characteristics of evanescent wave through artificial LHM are simulated and the 3D meta-finite-difference FDTD technique in the finite calculation domain is used to simulate the artificial heterogeneous media, and the amplitude distribution of the evanescent wave field in the hollow waveguide is obtained. The influence of the deviation of the electromagnetic parameters of the medium and the ideal perfect lens on the recovery of the evanescent waves by the metamaterials is simulated. The simulation results show that the metamaterials partially recover the amplitude of the evanescent wave. The simulation model can be used in the finite calculation domain Studying the properties of evanescent wave alone can be applied to the experiment to verify the effect of metamaterial on evanescent wave.