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SiEPIC / openEBL-2024-05

Submission for fabrication of silicon photonics for the openEBL run
https://siepic.ca/openebl/
MIT License
6 stars 80 forks source link

Asking about SEMs #130

Open JohnGerguis opened 2 months ago

JohnGerguis commented 2 months ago

I was adding SEMs in the layouts but they are removed in the merged layout, is there something wrong that I might be doing? Also, where can I pay for the SEMs as an alumni?

lukasc-ubc commented 2 months ago

Hi John,

For the openEBL, we strip off the SEM layer. Can you please rename your files as EBeam instead of openEBL? We keep the SEM boxes there. For the payment, please use the same details as last time.

thank you Lukas

lukasc-ubc commented 2 months ago

Also, how well does your strip to slot converter work? I imagine it has significant reflections and loss?

Have you tried adiabatic converters?

JohnGerguis commented 2 months ago

Hi Prof. Lukas,

Thank you so much! I renamed the files and resubmitted them.

When I tested the strip to slot converter separately, it looked very good, with very low losses and no significant ripples. However, all the slotted Bragg gratings (they have the converter) that I tried to fabricate didn't work, so I am not sure if the issue is in slotted grating itself or might be related to the converter when added to it. I am trying more variations with more slot widths this time, and a couple of designs with adiabatic converters to conclude. Hopefully, they will work :)

Thanks!

lukasc-ubc commented 2 months ago

We've published some work on slot Bragg waveguide cavities, so I know they can be made to work. The loss of the slot waveguide is quite high, so perhaps that is a factor. Otherwise, what is the Bragg wavelength and how did you design it?

JohnGerguis commented 2 months ago

I have designed it for 1550 nm. I used to design 80-nm slot and tried different ways to design it, such as simulating a unit cell, simulating the whole structure on 3D FDTD, and simply computing the neff of the slotted waveguide and computing the periodicity from there. The different methods lead to slightly different results, but I believe that I should have seen any Bragg response, even if shifted.

Yes, you have a paper for 150-nm and 200-nm slotted Bragg gratings, that's why I have added some designs in this run for the 150-nm slot, as maybe the 80-nm slot is too small. Hopefully one of them will work.