Home Forums FDTD Maximum 200 sample points in DFT spectrum?

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    • #43705
      Christopher Dirdal
      Participant

      I want to resolve guided resonance modes in the power spectrum of transmission through photonic crystal slabs and require high spectral resolution to do so. As written in the manual, the frequency domain sampling step is inverse proportional to the simulation time 1/2NDt. Why is it then that the maximum sampling points I can select in the 3D simulation menu is set to 200?

    • #43748
      Jing Wang
      Participant

      In previous version of OptiFDTD, there existed 2 options to obtain spectral response – FFT and DFT. The frequency domain sampling step was 1/(2N*Dt) for FFT. For DFT, it gave spectral response for a series of wavelengths which was identified by users. the more selected wavelengths, the slower DFT (FDTD) runs. so a max. number on sampling points (e.g. 200) was set. We removed FFT some time ago and only keep DFT.

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