you have two questions:
1: 2D material with dispersion
2: simulation source
For 2D conductivity material, you can import data. Please refer to Creating new sampled data materials in FDTD it is the same as permittivity/index in terms of data. You can select add/2D sample data in material database.
Modulator usually is based on waveguide. If your THz modulator is a kind of waveguide with the 2D material, you can use mode source or port. Please visit this example: Spatial soliton in a graphene-embedded waveguide
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