Comments (2)
Hello,
Could you solve this problem? I was trying to use Hz polarization but I am facing with two main problems:
- When the mode is excited in a straight waveguide for normalization, I can observe that the field does not seem as it expected to be. Here is the images for 300 nm waveguide and 400 nm waveguide, respectively.
There is a bright point at the location where the mode is excited. I do not observe this on Ez polarization so I guess there is a problem with the field solution (or mode solution) on Hz polarization.
- When I ignore the problem in the mode and try to use Hz polarization for optimization, it does not converge and terminate early by returning a warning from LBFGS as: ABNORMAL_TERMINATION_IN_LNSRCH. When I searched for it, I saw that the problem usually arises from the mismatch between the objective function and the gradient.
So, I guess the slight difference on adjoint sensitivity may arise from the improper mode solution or field solution and thus effect the optimization. Do you have a solution for this problem as I need to use Hz polarization? Moreover, I see that you have a new package 'ceviche', do you still face Hz polarization problem on its FDFD solver because I see that most of your notebook examples are on Ez polarization.
Thank you.
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Hi @aonurdasdemir, I will look into the problem when i have more time but for now I'd recommend you use ceviche as the Hz polarization seems reliable at the moment. (Even though examples are in Ez).
from angler.
Related Issues (20)
- Change all to `angler`
- Beautify Readme
- Make website / Docs
- Flexible Objective function inputs
- Anglerfish logo
- Specifying permittivity with geometric primitives HOT 4
- Nonlinear adjoints for Hz polarization
- Polarization independence HOT 1
- 3D solver
- E fields same shape as eps_r
- Consider using autograd for all gradient calculations HOT 16
- Choosing a default solver HOT 2
- Background Index HOT 5
- Angler 2.0 HOT 3
- Making the output in second mode HOT 1
- 'W' matrix (for filter) cannot be constructed when NPML=[0,0].
- Acoustic Simulation / Optimization HOT 3
- simulation.setup_modes() error HOT 2
- Least Squares Definiton for Objective Function HOT 1
- Maybe a function to generate GDSII files could be added to facilitate processing to verify the accuracy of the device. HOT 1
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