Autoshutoff level

- May 8, 2021 at 8:15 pm
  
  skvarshney
  Subscriber
  
  Hi,
  I am trying to simulate a one dimensional photonic crystal cavity with FDTD boundary conditions as below:
- May 11, 2021 at 4:52 pm
  
  Taylor Robertson
  Ansys Employee
  
  Hello Svarshney Please refer to this page , https://support.lumerical.com/hc/en-us/articles/360041611774-Quality-factor-calculations-for-a-resonant-cavity, for a discussion on how to calculate the q factor. In short the only way to reduce auto-shutoff is to allow the simulation to run longer. Using the high q analysis group; however, you should be able to get the Q factor so this is correct. This is a pretty sensitive parameter, and so an order of magnitude calculation seems pretty reasonable.
  I would consider using PML on all boundary conditions, as this will more accurately consider the Q of an isolated cavity. Currently, with Bloch you are looking at the Q factor of an infinite array of cavities. This will provide more loos channels and have the simulation run faster. You may want to move the BC further away from the cavity.
  Best