I’m trying to simulate the transmission through Subwavelength Grating waveguide structures.
I initially tried using a mode source to simulate this, but quickly realized that the mode source assumes a homogeneous waveguide, and thus is not suitable for the simulation of an SWG.
Therefore, I made another simulation where the homogeneous strip waveguide gradually tapers into a SWG waveguide, and obtained the mode profile at the SWG there.
Using this profile, I returned to the SWG waveguide simulation (as shown above) and used the Import Source option to start the simulation.
However, I have been noticing a lot of losses in my mode propagation through the SWG waveguide. Is there an error in my method? I’m beginning to wonder if, the fact that the SWG mode is a Bloch-Floquet mode, is inducing some sort of mode-mismatch losses in my simulation.