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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › 2D grating phase calculation Lumerical RCWA 2023 R1 › Reply To: 2D grating phase calculation Lumerical RCWA 2023 R1

July 24, 2024 at 8:10 pm
Amrita Pati
Ansys Employee

Hi Giovanni,

Thanks for sharing the info! I do not see any interfaces in the RCWA setup. You need to setup interfaces to tell the RCWA solver about the different layers of your geometry along the propagation direction. Then RCWA solves Maxwell’s equations in each layer, following which the fields are matched at the interfaces to calculate the overall reflection/transmission of the geometry. You should have interfaces at the red lines shown below:

I will recommend using the “reference interface positions” as you can set the interfaces using the max/min cooridinates of the different objects instead of using absolute co-ordinate values. I will recommend going through this introductory article for more information on how the algorithm works: RCWA: Solver Introduction. I will also recommend you to check out this example: SRG for AR Systems to see how the interfaces have been setup. 

Please feel free to let me know if you have any questions.

Regards,
Amrita