Hi Minu,
I apologize for the delay in getting back to you. I wasn't sure about the setup and I thought I will discuss this internally before I respond to you. We don't think that EME will be a good choice to simulate this geometry. EME is typically used for geometries that support guided modes like waveguides, but it will be challenging to attain convergence in the SWG section. These gratings have a 3D mode distrubution, where as in EME when we only consider and match 2D modes that assume logitudinal invariance. Another point is that we don't advise users to simulate subwavelength geometries using EME. They also support a lot of evanescent modes that can be really hard to match at the interfaces. I will recommend using 3D FDTD and adding a transmission monitor on the grating side.
Regards,
Amrita
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