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Damian Marek

Prism coupling can be simulated in OptiFDTD just as it would be done in real life:

1. Create a waveguide geometry and calculate associated modes (this can be done using OptiMode, that comes along with OptiFDTD)

2. Position a high index prism (where n_prism > n_waveguide) directly above the waveguide. Here, we are only simulating the near-field, so a prism is approximated as a rectangle of semi-infinite extent.

3. Launch a plane wave into the prism with carefully chosen angle (we can use a gaussian beam in order to avoid interferences at the boundary edges)

See the example attached.