I want to calculate the effective index of a signle strip waveguide 410nm*220nm.
However, the effective index changes with meshsize.
The simulation wavelength is set as 1310nm.
When meshsize=10nm, Neff=2.585929
When meshsize=20nm, Neff=2.581679
Which value is more accurate? How to solve this problem?
The neff difference may lead to a big variation in some phase sensitive device.
swg_neff.lms (238.1 KB)