Fig. 4From: Double Narrowband Induced Perfect Absorption Photonic Sensor Based on Graphene–Dielectric–Gold Hybrid Metamateriala The spectra of the FDTD numerical and CMT simulation with the Fermi level changing from 0.5 to 1.0 eV. b The real and imaginary parts of the impedance Z when Ef = 1.0 eV. c Three-dimensional diagram of absorption with the Fermi level and frequency. Here, the discussed structure is Fig. 1a and other parameters are nd = 2, nsur = 1Back to article page