3d works now We even did (attempted) 3d inverse design of a silicon photonics signal splitter - it’s converging though the low resolution (for saving time) produced artifacts. Below are 3d scattering and antenna simulations. Previous 1d/2d code broke but will be fixed later
We also reduced malloc without messing up autodiff by using Zygote.Buffer and renamed to FDTDEngine until we find a better name
If you’re running 3d simulations feel free to try. Follow the quickstart in docs
If you’re doing inverse design then it’s more complicated since geometry generation and FOM are problem specific. Message me for starter scripts.
We’ll clean up repo and tighten up the inverse design scripts for silicon photonics and RF metamaterials in the coming weeks
Could this simulate arbitrary strip-line antenna geometry and calculate far-field complex polarization responses for arbitrary frequencies and angle of arrivals?
Yes I can add such a postprocessing feature - just need to fft the monitor surfaces and do a far field integration. Or just far field integrate the approximate current distribution on the strip without FDTD. I can make either adjoint differentiable. Feel free to PM me.
Added GPU support, forward and adjoint. Improved API for monitors, modal sources… Did inverse design of a simple 3d signal splitter in silicon photonics
spherical monitor for nearfield radiation pattern (see antenna example)
documentation for tutorials
inverse design example now does a 2D TE adjoint optimization first as a fast approximation (3D adjoint optimization has stability issues requiring a low Courant #)
Only a specialized wrapper, in same style as gdsfactory gplugin for meep. Workflow is to create IC layout in gdsfactory and call plugin for sparams or inverse design.
Here’s a working draft of the python api gdsfactory plugin for photonics. Can get sparams or do inverse design in just few lines of code. LMK of your thoughts
Great work! I’m trying to install the packages based on the tutorial and running into compatibility issues. Do you have the version info for the julia installation and packages you currently have working? Or any tips on addressing the compatibility issues?
restricted by julia compatibility requirements to versions: uninstalled — no versions left.
All that said, this may be an error in how I’m setting things up or an issue outside of the scope of this project, but in case it’s an issue other users might encounter, I wanted to put it on your radar.
Ok. Mostly resolved. Installed julia by “curl” directly from julialang.org. Version matches now. The rest of the installation works well. …until GLMakie
ERROR: LoadError: GLFWError (API_UNAVAILABLE): EGL: Failed to get EGL display: Success
Is there a way around this?
(For context, this is on WSL w/ Ubuntu)
Yeah GLMakie (3D plot) is known to fail in many cases eg headless servers. I’ll make a fallback to a 2D plot in tonight’s update to catch GLMakie failures.
I updated the front end, installed CairoMakie (and Uninstalled GLMakie), and also installed Porcupine (not listed in the packages, but it seems like the first example script in the tutorial needs it). The first script runs with this error:
ERROR: LoadError: UndefVarError: heatmap not defined
for
File “/home/blah/blah/python3.11/site-packages/luminescent/gplugins/luminescent/sol.py”, line 73, in write_sparams
We even did (attempted) 3d inverse design of a silicon photonics signal splitter - it’s converging though the low resolution (for saving time) produced artifacts. Below are 3d scattering and antenna simulations. Previous 1d/2d code broke but will be fixed later