We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum › Forums › Discuss Simulation › Photonics › Antireflective circular polarizers in OLED display simulation › Reply To: Antireflective circular polarizers in OLED display simulation

July 9, 2024 at 6:10 pm
Guilin Sun
Ansys Employee

 

A1： it is the same as n2cosθ2/n1cosθ1. However it uses theta1 instead of theta2. You can deduct this formula with only theta1 with Snell’s law.

A2: Stack function can deal with dispersive material. Please refer to this: https://optics.ansys.com/hc/en-us/articles/360034406254-stackrt-Script-command

for RCWA, it is designed for periodic nano structure, and you may need to test how many k vectors are to be used in general.

For planar structure like thin films, in principle both should give the same result, with minor difference due to the fact: STACK is analytical without meshing whereas RCWA is semianalytical which needs meshing. The difference might be from meshing.

A3: I guess you uploaded the wrong images. 

RCWA needs converging tests for mesh and k vectors in general, provided that the material model is exactly the same. Please note that STACK uses FDTD fitted material data. RCWA is frequency-domain solver so it might simply use the material raw data if you do not set the fit:

 

Â