Hi ! Good Evening to all :)
As of Im doing my research in photonic studies particularly in study of Optical Microring Resonator of 2D implementation by using the COMSOL Multiphysics 5.5 , I might wanna seek for opinion regarding certain of my result , is it I'm doing it the correct way to design it ? or is it im approaching the correct way to design it ?
Thanks ! :)
Hi Syafiq! How are you doing? Have you done your research?
As for 2D simulation of MRR. The first question is, did you use the effective index method for collapsing the height of the waveguide? If no, you would not get proper results for the spectral response. If you are going to do 2D simulations you would need to use EIM or other ways to include the dispersion of a structure. You can find a good explanation of EIM for instance in the book "Computational photonics an introduction with MATLAB" by Marek S.
My opinion is Comsol is not convenient software for simulation of MRR or CROW or SCISSOR. I would recommend you to implement the transfer matrix method (TMM) on MATLAB to simulate single rings or cascaded rings (You can find information about it in the book "Integrated ring resonators" the compendium by D.G. Rabus) or whatever you want. TMM is much faster than Comsol based on FEM. Also when you use TMM material dispersion is directly included in the simulation, you do not have to use any approximation for the calculation of propagation constant, there is a possibility to include losses sources into a simulation.
Steps for TMM sim:
1) Specify waveguide cross-section and materials properties,
2) Find effective indices or propagation constants for each wavelength you used (it could be done by any Mode solver including Comsol) and save it in a text file,
3) Specify MRR structure,
4) Do TMM simulation.
Wish you success and have a good time :)
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