[pre-ANN] Differentiable FDTD for inverse design in photonics, acoustics and RF

Beautiful. :slight_smile: Works perfectly. I ran a check with 2D on the first one for speed / I’ll run tests on the other case later, but overall, excellent work!

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Thanks for being an early tester! We ironed out issues and released a new notebook with examples. If you’re benchmarking speed I’ll need to separate out the compilation part (todo list). Here are some inverse designs of wavelength domain demultiplexer and symmetric crossing, all in just few lines of code.

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