I’m trying to do a simple normal incidence reflection/transmission spectrum of a thin layer of MoS2 on top of a glass substrate.
I imported the data for the dielectric function of MoS2 from another paper and made it a sampled data material. Now I am modelling it as layer of 0.615 nm on top of a glass substrate (that’s the approximate thickness of a monolayer of MoS2.) Actually the results I am getting for the reflection are pretty good in the sense that they match this paper very closely, which is encouraging since I took the values for dielectric constant of MoS2 from it.
In figure 1© in the paper you can see there is a slight peak in the reflectance at a little less than 2 eV, and my result shows a similar peak of ~.04 at ~630 nm. Then it goes to a larger peak slightly above .08 at ~400 nm as the paper does around 3 eV.
The problem in my result is that lumerical does not seem to resolve the splitting between the A&B peak. I’ve tried increasing the mesh around the interface to .1 nm.
I also tried making my material thicker (like up to 70 nm) and when I increase thickness I do start to get some features but I’m not sure if they’re Fabry-Perot resonances or some other effects. I also checked the material explorer fit for MoS2 and it seems to be good.
Thanks in advance for any help.
I also attached the text file for the MoS2 data and my FDTD file.