平面光源倾斜入射时，如何仿真得到反射光谱

- December 21, 2022 at 6:03 am
  
  sunfuwei
  Subscriber
  
  老师您好，最近我在做一个光源入射角为30°的仿真，光源是由两个平面光组成的圆偏振光，我想得到反射角为30°的反射光。但是monitor是无法旋转的，所以反射光谱的monitor仍然按照Z-normal的条件设置的，得到的反射光谱我感觉更像一种衍射光谱，所以想问一下如何采集出反射角为30°的反射光，谢谢！
- December 21, 2022 at 3:16 pm
  
  Guilin Sun
  Ansys Employee
  
  如果使用周期边界，里面是微结构，仿真的结果当然是光栅衍射。监视器不需要旋转，因为结果是用颇印廷矢量积分得到的透射率：
  Ansys Insight: FDTD 初学者： transmission函数的使用、透射率反射率正负号问题
  请参考
  Ansys Insight: 周期结构、宽光谱平面波斜入射时仿真应该使用什么边界条件（综合贴）
  如果是想仿真BSDF，你需要用更大的周期，至于多大才算大，需要自己分析掌握，一般是用几十个空间相关长度。具体请找一些参考文献，网站例子参见 Bidirectional scattering distribution function (BSDF)

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