The gold standard for modeling sub-wavelength optical components. The 2020 update enhanced performance for complex geometries and increased GPU acceleration support.
While Lumerical has historically been a premium enterprise tool, Ansys offers free student versions for many of its core technologies, such as Ansys Discovery Student and Ansys Electronics Desktop Student . ANSYS Lumerical 2020 Free Download
16GB minimum (32GB+ highly recommended for large FDTD simulations). ANSYS Lumerical 2020 Free Download