Evanescent-wave source

- April 8, 2022 at 6:28 pm
  
  KumarVinjeet
  Subscriber
  
  I am using FDTD module. I want to have an evanescent wave source on one side. How can I have an evanescent wave source? Please help.
- April 11, 2022 at 11:53 pm
  
  Guilin Sun
  Ansys Employee
  
  I would assume that such device will support this evanescent wave. Therefore you can use mode source to find this evanescent mode.
  In case this is created by total internal reflection, you may either need to simulate the whole device, as this example:
  https://support.lumerical.com/hc/en-us/articles/360042089613-Evanescent-coupling-through-a-low-index-gap
  or if it is due to evanescent coupling: Evanescent waveguide couplers
  or you will need to import the source data from analytical solution or simulation monitor: https://support.lumerical.com/hc/en-us/articles/360034383054-Using-an-equation-to-define-the-spatial-field-profile-of-a-source-in-FDTD
  So it is all dependent on the device mechanism and the physical source excitation.

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