3D waveguide FDTD for coupling loss
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I am trying to set up 3D polymer waveguide FDTD simulation like the picture shown below:
Currently Lumerical FDTD can handle straight geometry like
https://support.lumerical.com/hc/en-us/articles/360034382214-Custom-structure-object-Simulation-Object
https://support.lumerical.com/hc/en-us/articles/360034901533-Surface-structure-object-Simulation-Object
For the 3D trajectory you showed, if you know the cross section data, you can create it by the use of structure group. It builds up the 3D trajectory by layered cylinder, layer by layer. Please refer this :
I would suggest that you simulate the devices by 3 different sections: fiber to the 3D trajectory, the trajectory its self to optimize its length in order to reach highest transmission, and the small end to the chip (detector?)? you can do cascading simulations: Using monitor data to define the spatial field
or you simulate each part, get the s parameters (it may involve many modes), and then use T matrix or S matrix methods to combine the final S parameters, which is a new project.
200um is relative long but doable, depending on your computer resources and performance. You may also try the Cloud simulation.
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