Different sources

[Yaraslaut]

Hi, thanks for the great tool :) At the moment I see that only dipole sources are implemented, and there is no easy way for user to create a point source or am i missing something? So I'm wondering if other sources like point, plane wave, gausian will be implemented?

Also, what should I do if I want to calcualte structures that are longer in z direction than restriction for the grid size?

And maybe last question :) How I can take snapshots of field distribution at some time ?

[jlu-spins]

Hi @Yaraslaut!

• Plane sources are implemented, but unfortunately at this time you have to code the distribution (Gaussian, waveguide mode, ...) yourself. fdtd-z is still really low-level. That said, please see https://github.com/spinsphotonics/utilz/blob/main/src/utilz/modes.py for my mode computing code.

• Unfortunately, the z-dimension of the simulation domain is a hard limit in fdtd-z that is currently an absolutely fundamental (for performance reasons) assumption in the code.

• Snapshotting can be controlled via the output_steps parameter of fdtdz_jax.fdtdz().

Hope this helps! Please keep the questions coming!

[Yaraslaut]

Thanks for the answer @jlu-spins, I think that i can close the issue and open new one if will face any chalanges :)

Since you plan to keep fdtdz very low-level, are you also planning to implement some wrapper package?

[jlu-spins]

Yes, currently working on https://github.com/spinsphotonics/pjz with inverse design as the target application.