Shifted spectrum resonances

    • Moptic

      I have been simulating grated ring structures and even when the source is set to 1.5 to 1.6, I appear to be only getting resonances beyond this range when using 2D FDTD of the FDTD solutions (as shown in the spectrum). However, the same structures in varFDTD using the MODE solutions package show a spectrum across the whole range of the frequency monitor. I am wondering if there is a setting which may be causing a large shift of the resonances in the FDTD simulation?

      Many thanks in advance for assistance

    • Guilin Sun
      Ansys Employee
      In general, 2D FDTD and varFDTD are different:
      2D simulation means the 3rd dimension is infinite; whereas varFDTD uses the limited size in 3rd dimension, and uses an "equivalent" refractive index in its FDTD simulation. It is "quasi" 3D simulation.
      Therefore, the two solvers simulate "different" devices actually.
      I would suggest that you use varFDTD, and then verify the result with 3D FDTD.
      please refer those links:
      MODE - 2.5D varFDTD solver introduction
      Finite Difference Time Domain (FDTD) solver introduction
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