Photonics

Photonics

FDTD angles rotation

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    • adophobr
      Subscriber

      I'm trying to simulate the following directional coupler at Lumerical FDTD:

    • Guilin Sun
      Ansys Employee
      Hi, This is expected result from Lumerical's definition: when the light travels to the negative direction of an axis, its transmission is "negative" due to the fact that light travels in the backward direction, which is opposite to the surface normal from the integration of the Poyinting vector:
      https://support.lumerical.com/hc/en-us/articles/360034405354-transmission-Script-command
      As you know, the transmission is always positive in physics. You can add a negative sign in front of the transmission, or simply use -Re in Visualizer, or use absolute value. I would recommend the first two options.
      you can use this script to get the surface normal:
      ?getdata("monitor name","surface_normal");

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