FDTD仿真监视器问题

- April 24, 2023 at 3:48 am
  
  Thomas Bob
  Subscriber
  
  孙老师您好！我在仿真硅波导结构时遇到一个问题。硅波导结构是厚度220nm×宽度450nm，长度4μm。
  我在波导的尾端加了个功率监视器，但最终检测到的透过率不到0.2，光源是从MODE里同结构计算出的TE基模导入的。
  下面这个图是对波导传输方向的截面的功率监视：
  想请教的问题是：TE基模在硅波导里传输，为什么导波尾端的透过率很低？我理解的是，既然基模可以在硅波导存在且分布的很好的话，其传输不应该有如此大的损耗。
- April 26, 2023 at 7:43 am
  
  guanyo.dong
  Subscriber
  
  您好!
  目前的模型中,在出入口都有空氣介面，這樣數據會受到Si-Air端面的反光影響，由於光源同調，這樣說不定仿的長度、Monitor與端面的距離、端面與FDTD的距離都會影響您的結果，因為反射光與光源干涉了
  建議您把X方向結構都延伸出FDTD仿真區的範圍再試試看
  
  莎益博-董冠佑

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