Updating import gds tutorial

[FilipeFcp]

Hi @tomflexcompute

I split it into two notebooks, but we can delete the one about creating the file if you think it is not necessary.

I also added the files for the Multipole Expansion notebook to the JSON mapping. I learned about it from your comment on the Yuanshen notebook.

[github-actions]

Spell Check Report

GDSImport.ipynb:

Cell 7, Line 3: 'dtypes'
  > For a simple case, we can iterate through the polygons and inspect the layers and dtypes.

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Checked 2 notebook(s). Found spelling errors in 1 file(s).
Generated by GitHub Action run: https://github.com/flexcompute/tidy3d-notebooks/actions/runs/16036177150

[e-g-melo]

Thanks @FilipeFcp! This new organization is very helpful.

GDSCreation.ipynb

1. I suggest renaming this notebook to "Layout design using gdstk" or something similar.
2. Maybe you could modify this sentence a bit to avoid starting it with a variable "sidewall_angle > 0 corresponds to a typical fabrication scenario where the base of the device is larger than the top."
3. I think we don't have an example of a simple directional coupler simulation (only that broadband one). Maybe we could use this layout to add a new one.

GDSImport.ipynb

1. I also suggest modifying this sentence to avoid starting it with a variable name: "sidewall_angle > 0 corresponds to a typical fabrication scenario where the base of the device is larger than the top."
2. "into a tidy3d.Simulation as td.Structures with..." -> "into a td.Simulation as td.Structures with..."

[tomflexcompute]

Thanks @FilipeFcp . The splitting makes sense.

1. In the GDSCreation notebook, the title still reads "Importing GDS files".
2. In the GDSCreation notebook, maybe also mention PhotonForge as our own layout tool.
3. Please update the rst files for the new notebook.

[FilipeFcp]

Thank you all for the comments.
@e-g-melo , do you mean adding the simulation to the same notebook, or creating a separate notebook for it?
I'm slightly leaning toward a separate notebook that imports the GDS, focuses on the simulation, and includes links to the two tutorials.

[e-g-melo]

@e-g-melo , do you mean adding the simulation to the same notebook, or creating a separate notebook for it?
I'm slightly leaning toward a separate notebook that imports the GDS, focuses on the simulation, and includes links to the two tutorials.

Create a separate one.

[daquinteroflex]

Will this go in 2.9?

[FilipeFcp]

@daquinteroflex I didn't know that was relevant for notebooks. Is there something I need to do?