关于各向异性介电常数的问题

- July 4, 2023 at 1:39 pm
  
  feng huan
  Subscriber
  
  在lumerical FDTD 中如何添加具有非对角项的介电常数张量，直接从materials里添加的只有对角张量，对于非对角张量的介电常数该如何设置，其中介电常数是随着频率变化的，不是固定的值。
- July 4, 2023 at 2:35 pm
  
  Guilin Sun
  Ansys Employee
  
  首先你需要自己推导一下，看看变换矩阵是不是也是频率的函数，如果是就比较麻烦，如果不是，仅对角线元素有色散很好办：
  参见
  Ansys Insight: 用于设置如何设置光学各向异性材料？
  或者这个例子 https://optics.ansys.com/hc/en-us/articles/360034394694-Creating-anisotropic-optical-materials-in-FDTD-and-MODE
- July 6, 2023 at 11:26 am
  
  feng huan
  Subscriber
  
  非常感谢您的回答介电常数是随着频率变化的这个我应该怎么样设置在FDTD中是需要自己编程序还是如何添加介电常数的分量是epsilon_xx, epsilon_yy, epsilon_zz, 都是lortenz的模型这个该怎么解决。
- July 6, 2023 at 5:22 pm
  
  Guilin Sun
  Ansys Employee
  
  按链接的第三种方法，先生成频率频率波长/epsilon_xx, epsilon_yy, epsilon_zz（实部虚部）的文本文件，再输入进来。记住添加Matrix Attribute中的变换矩阵。
  参见 https://optics.ansys.com/hc/en-us/articles/360034915093-Creating-new-sampled-data-materials-in-FDTD

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