uploading APD example

[FilipeFcp]

Hi all,

I’ve added some text and the image.
The mode simulation looks good, I ran a few tests, and the results seem quite solid. It’s a bit different from what’s shown in the paper, but if I understood correctly, they simulate the coupling from the Si waveguide into the Ge region. Nevertheless, the results for the photocurrent appear consistent.

The main discrepancy occurs around 11 V, which seems to correspond to the breakdown voltage. But I couldn't figure out why.

[github-actions]

Spell Check Report

AvalanchePhotodiode.ipynb:

Cell 2, Line 1: 'Photodiode'
  > # Avalanche Photodiode
Cell 2, Line 3: 'photodiode'
  > This notebook demonstrates the modeling of an on-chip avalanche photodiode (APD).
Cell 2, Line 13: 'band-to-band'
  > We will define both the optical and charge properties of the materials, including doping, and models for band-to-band tunneling and impact ionization.
Cell 10, Line 8: 'ymin'
  > source="ymin",
Cell 10, Line 27: 'ConstantDoping'
  > # p_Ge = td.ConstantDoping.from_bounds(concentration=1e18, rmin=(-ge_b_w, si_b_h+si_t_h-s_ol, -z_size), rmax=(ge_b_w, si_b_h+si_t_h+ge_h+s_ol, z_size))
Cell 12, Line 14: 'Nunley'
  > optical=td.material_library["Ge"]["Nunley"],
Cell 21, Line 8: 'x-size'
  > # Cross-section simulation (x-size=0), periodic bc OK for mode extraction

---

Checked 1 notebook(s). Found spelling errors in 1 file(s).
Generated by GitHub Action run: https://github.com/flexcompute/tidy3d-notebooks/actions/runs/19183204843