Can I ask how I determine the focusing efficiency in the metalens using Lumerical FDTD?
Would you let me know the definition of "focusing efficiency" according to the reference you are probably citing?
Without knowing its definition, it would be difficult to tell how to calculate it from the simulation result.
the name of the paper is: Polarization Insensitive, Broadband, Near Diffraction Limited Metalens in Ultraviolet Region
Focusing efficiency is the ratio of the total light intensity at the focal spot to the transmitted light.
Ansys customers with active commercial software licenses can access the customer portal and submit support questions. You will need your active account number to register.