Added the spin selector notebook and associated files

[tomflexcompute]

Added the spin selector notebook and associated files

[github-actions]

Spell Check Report

PhotonicSpinSelector.ipynb:

Cell 1, Line 5: 'cross-coupling', 'left-circularly', 'polarization-dependent', 'right-circularly'
  > We focus exclusively on the photonic design problem: modeling the sub-wavelength pixelated PSS geometry, launching circularly polarized free-space excitation, and evaluating how efficiently opposite photon spin states are routed into different waveguides. The device consists of a circular design region with a radius of 1.8 µm, discretized into subwavelength binary pixels that can be either silicon nitride or air. For each pixel configuration, a 3D FDTD simulation is used to evaluate the polarization-dependent transmission into the left and right waveguides. A figure of merit is defined to maximize coupling of right-circularly polarized light into one waveguide and left-circularly polarized light into the other, while suppressing cross-coupling. The optimization is performed using a direct binary search (DBS) algorithm, which iteratively flips individual pixels and retains changes only when the figure of merit improves.
Cell 12, Line 2: 'azimuthally'
  > """
Cell 22, Line 2: 'left-circularly', 'right-circularly'
  > """
Cell 22, Line 13: 'left-circularly'
  > # Calculate the transmitted power for RCP input, detected as left-circularly polarized (LCP).
Cell 22, Line 15: 'right-circularly'
  > # Calculate the transmitted power for RCP input, detected as right-circularly polarized (RCP).
Cell 22, Line 17: 'left-circularly'
  > # Calculate the transmitted power for LCP input, detected as left-circularly polarized (LCP).
Cell 22, Line 19: 'right-circularly'
  > # Calculate the transmitted power for LCP input, detected as right-circularly polarized (RCP).

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Checked 1 notebook(s). Found spelling errors in 1 file(s).
Generated by GitHub Action run: https://github.com/flexcompute/tidy3d-notebooks/actions/runs/20312102809

[FilipeFcp]

Pretty cool notebook!

I have nothing to comment on, except for a couple of minor typos:

above cell 2: thickenss → thickness
above cell 12: geneerate → generate

[alec-flexcompute]

Excellent notebook once again @tomflexcompute !

Only one typo: above cell 12, "generate" is misspelled

Other than that, looks perfect!