Hi, I am new to this and trying to design a waveguide at 850 nm. So I simulated the structure in Lumerical for different core sizes. These three graphs(attached) are the results I got for mode 1( which I think is a fundamental mode). How do I conclude the result, should I choose the core size for which TE fraction is 1? How TE/TM ratio and other parameters will affect the optimization process? Also I'd like to know how optimization process will differ for single mode.
Thanks for reading. I really appreciate any suggestion.
There is not always a straightforward answer and the decisions you want to take depends on various constraints (Is it purely theoretical or do you plan something experimental as well; Thickness avaiable in the Fab you intend to use; Quality of materials; material losses; safety margins, etc. etc.).
For practical issues of simulation (in particular in lumerical) and decision making, I can highly recommend the book by Chrostowski and Hochberg (silicon photonics design: from devices to systems); No matter if you work with silicon photonics or any other material, the decision making and design principles are the same.
If you intend a real experiment, it is very common that you actually fabricate not just one waveguide, but actually fabricate a whole series of thicknesses or width (or whatever paramterers you have freedom of choice) to get a real feel for "the right" waveguide for your application. Usually simulation is one thing, but in reality sometimes the waveguide, which is according to the simulation the "best", in reality sometimes isn't.
Regards,
Michael
Michael Rüsing Thank you, actually I am currently reading it right now. How is his Photonics design course available in edX?
As Michael mentioned, the optimization of the waveguide geometry and choice of material system depends on the application for which you intend to design the waveguide. Hence, I would also recommend you to first understand the basics of the waveguide designing.
The silicon photonics course by Lukas Chrostowski on edX is a decent course but I would suggest you to first develop a little understanding of the waveguide designing. To develop strong fundamentals in this area, you should start with the planer (slab) waveguides. After that, reading "silicon photonics design: from devices to systems (Lukas Chrostowski)", suggested by Michael, would be really helpful.
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