# 異方性(非対角成分を持つ)材料導波路の等価屈折率の計算 (Anisotropic optical waveguide with Off-diagonal Elements in a Permittivity Tensor)

こんにちは、

1. Mode solutionsでは非対角成分をもつ異方性材料の導波路の等価屈折率を計算できますか？
2. FDTD solutionsでは非対角成分を持つ異方性導波路を定義できますが、
等価屈折率は計算できますか？もしFDTD solutionsで非対角成分を持つ導波路の等価屈折率を計算できるのでしたら、
チュートリアルファイル等は有りますか？

1- Can Mode solution calculate the Equivalent refractive index of Anisotropic optical waveguide with Off-diagonal Elements in a Permittivity Tensor?

2- I know that Anisotropic optical waveguide with Off-diagonal Elements in a Permittivity Tensor can be defined in FDTD, Is there any way to calculate the Equivalent refractive index for those structures? If yes, is there any documentation?"

Thanks

For material that contains off-diagonal terms in the permittivity tensor, it is possible for FDTD Solutions to simulation such application.

1. MODE Solutions can sometime perform some anisotropic material simulations but at this point I am not aware of a built-in feature for it to handle permittivity rotation - off diagonal terms. That being said, it might not be completely impossible to run some simulation. In any case, I will need more information, preferably a paper of reference, to determine what can or can not be done.

2. It is might be possible for FDTD Solutions, depending on the actually simulation details. For materials that involve off diagonal terms, we will need to rotate the frame or reference such that the permittivity tensor is diagonalized. We can handle some simulation like Magneto-optical type simulation. Depends on exactly what the user is looking for, I can provide more advise. Specifically, can you define the “equivalent refractive index”?

In any case, these are considered simulations that will require advance simulation skills. I am happy to discuss the feasibility of the software. But I will not recommend the user to run these type of simulation right away. Instead, I will encourage the user to watch the introductory videos, go through some getting started examples, and reproduce some published results,etc.