A：分析组里面有scat_ff 函数，可以实现远场pattern的作图，具体参考简介，但是注意再有衬底的情况下，需要对这个分析组的monitor做出相应的调整，具体描述如下：This example studies a particle surrounded by a homogeneous material. If the particle is on a substrate, the far field part of the analysis must be modified. The technique used in this example (projecting from a closed box of monitors) only works when all of the monitors are in a homogeneous material. When a substrate is present, the best way to calculate the far field scattering pattern is to use one monitor, located above or below the particle (depending if you want scattering in the forward or backwards direction). You can then use the standard farfield3d function. When using a single monitor, it’s important to make the simulation span large enough that most of the scattered light will pass through the monitor before hitting the PML absorbing boundary conditions.