i really don’t know how to appreciate your cooperation. i’m very proud to be one of your students.
as it seems, i’d better tell you the whole story of my work:
i want to observe the switching effect in an infinite sheet of graphene using magnetic biasing. with the presence of magnetic field, the surface conductivity of the graphene is changed drastically which is not defined in Lumerical yet. but as your colleague, fgomez, said, i can calculate the surface conductivity for a bunch of magnetic fields and frequencies and import them using 2D sampled data material. i followed the same procedure but still couldn’t get the desired results.
anyhow, the proposed structure is nothing but just a theoretical graphene-based switch. the infinite sheet of graphene is surrounded by air with no substrate, that’s why i disabled substrate, graphene middle and guide. the following picture is the imaginary part of the surface conductivity when subjected to a dc magnetic field (3 Tesla) as a function of frequency:
when the image sign is positive, tightly confinement of TM mode is expected to propagate, representing ON state. in this case, i’m expected to observe the oscillation of surface waves propagating along the surface of the graphene. on the contrary, when the image sign is negative, poor confinement of TE mode is expected to propagate, representing OFF state. in this case, i’m expected to observe the weak oscillation of surface waves propagating along the surface of the graphene. that is a theoretical background of my work.
following your suggestion, i set the bandwidth and frequency to 0.1 THz and 3 THz, respectively, resulting in a perfect fit. furthermore, i ran the 2D simulation and set the BCs to PML, but nothing is observed. i even increase the FDTD region in the hope of capturing a few oscillations but again resulted in failure.
i attached the text file of real and imaginary part of the surface conductivity (above picture) imported in the software, together with the updated simulation file.
3T.txt (12.2 KB)
magnetic biasing.fsp (743.6 KB)
i would be very glad if you continue helping me.
thank you again for all you’ve done for me.