metasurface에서 circular polarization light의 phase와 conversion efficiency 구하는 방법

- March 24, 2021 at 9:27 am
  
  Myunghwan
  Subscriber
  
  안녕하세요.
  
  lumerical FDTD로 circular polarization 빛 입사시 투과되는 빛의 RCP to LCP conversion efficiency와 phase를 구하려고 합니다.
  
  "A broadband achromatic metalens for focusing and imaging in the visible" 논문을 제현하려고 하는데 값이 다르게 나오네요. 어느 부분이 잘못됐는지 모르겠습니다.
- May 11, 2021 at 10:03 am
  
  Shin-Sung Kim
  Ansys Employee
  
  .
  grating_s_params 는 planewave 를 source 로 취하고, 특정 diffraction order 를 갖는 planewave 에 대해서 amplitude 및 phase 정보를 갖는 s-parameter 를 계산해 줍니다. 이 특정 방향의 planewave 는 s-parameter 만으로 완전히 정의되며, 이를 계산할 때, farfield projection 을 통해 1m 반구상에서의 field 를 계산하고, 역으로 source/monitor/구조물 사이의 간격을 고려해 phase compensation 을 하는 과정을 거쳐서, 최종적으로 metamaterial 로 인한 amplitude 및 phase 변화를 계산합니다.
  이러한 계산과정에 대한 설명은 다음 페이지에 나와 있으며, 보다 상세한 세부 설정 관련 설명은 script 내의 comment 를 참고하시기 바랍니다.
  Metamaterial S parameter extraction
  .

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