Photonics

Photonics

Appropriate Lumerical solver for a big structure

    • Mariah Ha
      Subscriber

      Hi,

      I am trying to study a light wave propagation at 0.85 microns wavelength ,through  a 20 by 20 microns photodiode, and import the generation into Charge solver to study the electric performance of the device. My question is , is FDTD solver appropriate in this case ( 0.85 wavelength <<< 20 microns structure) where the wavelength is very small compared to the size of the structure ? If not, what is the most suitable lumerical solver that I can use instead of FDTD, and how would I  import the generation from that new solver into charge?

      Thank you.

    • Guilin Sun
      Ansys Employee

      It should be ok to simulate such sized device. Other customers simulate even larger.

      You can first get the absorption density using an analysis group, such as from this example:

      https://optics.ansys.com/hc/en-us/articles/360042454814-Avalanche-photodetector

      and this one

      https://optics.ansys.com/hc/en-us/articles/360042828913-Germanium-on-Silicon-lateral-photodetector

       

      After obtaining the absorption power density in .mat data file, you can import to CHARGE.

    • Mariah Ha
      Subscriber

      Thank you so much for your assistance. I am importing the generation.mat file as an optical generation to charge,  in units of charge/m^3/s. You mean generation rate right ?

    • Guilin Sun
      Ansys Employee

      You are right.

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