Learning Forum

[Yao Xiao]

For the one-dimensional height ratio grating as shown in the figure below, when using rcwa for simulation, you should choose 2D or 3D. Because it is very long in the y direction, not periodic. Periodicity is only in the x direction. In the case of photonic crystals, both x and y are periodic, so three-dimensional is used. How that 1D raster should set the simulated dimension. I chose 2D but it doesn’t converge. I choose 3D to get results quickly but it’s wrong.

[Guilin Sun]

RCWA solves periodic problems. So if the length in y is long, you should use 2D and ignore its effect of limited size. 3D will require y direction periodic, the same as 2D since it assumes y is infinitely lone.

[Yao Xiao]

I tried to set it to 2D simulation, and then the calculation progress stayed at 7%, and finally crashed, and the result could not be calculated.

[Yao Xiao]

I didn't find a place to upload files, all settings are as follows

[Guilin Sun]

You may need to reload the file if it is not corrupted, copy the geometry to a new project and run it again. For faster testing, instead of using 201 frequency points, simply use 21 points, and test again. Make sure the file can run.