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Meep

FDTD-based open-source package supporting Python language, a variety of materials (nonlinear, gain, gyrotropic materials etc), GDSII import, Amazon cloud-based computing, adjoint solver etc.

S4 and Reticolo

Open source codes developed by Prof. Shanhui Fan's and Prof. Philippe Lalanne's groups, respectively. These codes are based on RCWA method. S4 runs faster, but Reticolo is better documented.

Tidy3D

Very fast FDTD- and cloud-based solver for large scale metasurface design and optimization.

Reticolo examples

I wrote two Reticolo examples on how to perform parameter sweep for a nanopillar and a nanofin, then calculated their polarization conversion efficiency, phase etc. 

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