Figure 8. The absorption as a function of work wavelength at the different layer number of graphene sheets (a), thickness of dielectric in graphene-based HMM (b) and relaxing time (c).

Where t_d = 8 nm and τ = 500 fs in (a), M = 1 and τ = 500 fs in (b), and t_d = 8 nm and M = 1 in (c), other parameters are as in Fig. 3.