阵列结构PML设置
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您好，我的仿真工作需要对阵列结构的周期进行sweep，在周期跨度较大的时候遇到了一些问题。
我的仿真波长范围大概是0.5-4um, 周期为0.5um的阵列结构设置了上下距离结构2um的PML，仿真结果没有异常的表现，但周期增加至1.6um以上时，在长波强共振位置处出现了透过率小于0的情况（下图1）。但是增加仿真时间，降低判断电磁场是否衰减到足够小的阈值以及降低mesh尺寸都没有办法解决，不断提高PML至上下距离结构4-5um左右可以得到解决（下图1）。
图1. 1.7 um周期的阵列在增加PML距离时长波处小于0的透过率得到修正
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