Learning Forum

[kalanie]

What is the procedure to obtain the phase shift vs unit cell radius of a metalens in FDTD lumerical without using RCWA?

[anna.wirth-singh]

Hello, thanks for your question. To obtain the phase shift of a unit cell in FDTD, the procedure is S-parameter extraction; we have some examples relevant to this. If you scroll down to the Appendix of this page, it explains how to do metalens unit cell simulations with FDTD, in addition to RCWA highlighted earlier in the article: Small-Scale Metalens – Field Propagation – Ansys Optics

There are some files to get you started in the .zip file that can be downloaded from the article. In particular, for FDTD, please load the unit_cell_fdtd.fsp file and then run the unit_cell_fdtd.lsf script. Please reply back if you have any questions.