你是说用频域监视器，然后选主分量获得位相吧？
此时应该选用Profile监视器，因为Power监视器会位移小于半个网格尺寸的位置而减小插值带来的误差。假设你用网格精度2，对应最大材料折射率的十分之一波长的网格尺寸，即10个网格位相就变化一个周期，有位移显然导致位相计算误差。
如果你知道是哪个分量，最好将Profile监视器就仿真那个分量在Yee Cell的位置上，参见
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