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Question About Phase and Transmission Calculation in Metaatom Simulation

- July 26, 2024 at 7:32 am
  
  Tongrui Pi
  Subscriber
  
  Dear Lumerical Community,
  
  I'm simulating the modulation of metaatoms and using the official example "Small-Scale Metalens – Field Propagation" (https://optics.ansys.com/hc/en-us/articles/360042097313-Small-Scale-Metalens-Field-Propagation). I noticed that when calculating the phase, we use "pinch(angle(S.S21_Gn))". However, when calculating the transmission, we use "pinch(T.T_Gn)" rather than "pinch(abs(S.S21_Gn))^2".
  
  I did some tests and found that the transmission results sometimes differ significantly. Does anyone know if there might be an error in my understanding, or is it a numerical error? Which method is more reliable?
  
  Thanks!
- July 26, 2024 at 8:26 am
  
  Tongrui Pi
  Subscriber
  
  Solved.

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