How can I use the Bessel Gaussian beam source in fdtd?

- December 12, 2024 at 12:23 pm
  
  sb2214
  Subscriber
  
  Lumerical only has Gaussian source, not Bessel Gaussian source. How to implement Bessel Gaussian source?
- December 13, 2024 at 7:54 am
  
  anna.wirth-singh
  Ansys Employee
  
  Hi,
  Thanks for the question. The available built-in sources are Gaussian, plane wave, and Cauchy/Lorentzian, so you will probably have to build a custom source to do this. One approach would be to define custom spatial field profile as a Matlab dataset and import it. Or, if you have a model of your beam from Zemax, you can import it a Zemax ZBF file. Please see Import source - Simulation object – Ansys Optics for more information on importing custom sources.
  Alternatively, if you know how to decompose your Bessel Gaussian source into plane waves, another approach would be to use a summation of plane wave sources to build up the custom source.
  Best,
  Anna