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How diffraction ray-tracing is calculated

  • 11 June 2020
  • 1 reply
  • 1548 views

Michael Cheng
Zemax Staff
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That's try to check math/eqaution details about how diffraction is calculated for ray-tracing.


Here is some key points for taking back:



  • The ray-tracing eqaution for grating and any phase profile are same.

    • They are all based on the principle that projected wave vector should be continuous at material boundaries.



  • The word 'conical diffraction' is explained.

  • The 'phase' in OpticStudio mainly describes 'periodicity'.

  • These diffraction calculation supports multiple-wavelength

    • This is true for all diffractive surfaces like: Binary 2, Zernike Standard Phase, Grid Phase, Diffraction Grating, Elliptical Grating, ... etc.

    • For Physical Optics Propagaion (POP) and metalens, the support to multi-wavelength for phase surfaces may be no longer true, but we don't discuss much here.




 















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Hi, 


We have a perpetual educational license. I wonder if you can suggest some example to set up a simulation for variable-length grating? 


My grating is 2D structure and looks like a continuous bar, and I am interested to see the first few diffraction orders of diffraction at three wavelengths (RGB). Any good examples to starts with?


 



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