您好，造成透射率大于1的原因有多种，比如仿真时间不够，精度不够，PML吸收不够等。
您这里使用了周期性边界，但是仿真区域设置似乎不正确，仿真区域需要满足周期性。您可以先查看Periodic boundary conditions in FDTD and MODE – Ansys Optics 检查周期性结构仿真的设置。
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