Hi James,
This is an interesting application and I’m sorry for the slow response! I’m trying to get a better idea of what you are interested in simulating. I’ve attached a picture from a dissertation that I believe is what you are referring to. Let me know if I am on the right track.
M. Pollinger, “Bottle microresonators for applications in quantum optics and all-optical
signal processing,” Ph.D. dissertation, Johannes Gutenberg University of Mainz, Mainz, Germany, 2010.