Reply To: Grating coupler tooth simulation with bloch boundaries

[Dimitris Polyzos]

Hello  Hrishikesh,

I hope you got my answer as something was woring with my PC. I will post it again just to be sure that you got it completed.

Thanks for your reply and sharing your model. As I suggested in a previous post of mine, I would recommend to extend the span of the source through the FDTD simulation boundaries as I am afraid that you didn not set it up correctly. More information why you should proceed with this extension of source spans can be found at this article:

Understanding-field-truncation-issues-with-finite-sized-plane-wave-sources

Plane-wave-and-beam-source-Simulation-object

Also, if you want to analyz the grating orders you should check the Gratings-List-of-Examples that inlcudes some good articles as well :

Nanobeam-grating

Diffraction-grating-DGTD

Grating coupler

I hope I helped. Please let me know if you need further assistance.

Kind regards

Dimitris