How to simulate graphene in visible domain

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#1

I want to simulate graphene like metal or dielectric by varing Chemical potential in visible light. However, I can not get the surface plamon in the structure, which is not accord with the calculation in theory.
Thank you!


#2

Graphene has a plasmonic effect in the MIR. Try the following example as a kick starter:
https://kb.lumerical.com/en/other_application_surface_plasmon_waveguide_swit.html

Try the on state where the chemical potential is high. A chemical potential of 0.5eV is enough to produce a plasmonic effect in the THz region. May be you need a much higher potential for the visible light. Do you have any numbers from published work?


#3

Yes, µc =2.2 eV for visible and has already been achieved in previous experiments.
Efetov D K and Kim P 2010 Controlling electron–phonon interactions in graphene at ultrahigh carrier
densitiesPhys. Rev. Lett.105256805.


#4

Ok, sorry for the delayed reply. I tried to do this in MIR. In order to find the mode I had to increase the value of effective index around which the solver looks for modes. It should be increased up to 50 to 60. I will upload a file for the visible using the chemical potential in this paper later today. You can also upload your file.


#5

Hi,
Kindly, find the attached file. The mode excited at the source is graphene plasmonic at 800 nm.
I changed the chemical potential of graphene to 2.2 eV. I tried to find the mode at lower wavelengths but I couldn’t given this value of chemical potential. The width of the waveguide is reduced to 0.5 um.
The mesh size was decreased due to higher confinement at smaller wavelength.

To get a plasmonic mode at lower wavelengths, you need to have higher chemical potential.

graphene_waveguide_switch.fsp (724.7 KB)