Fig. 4

The relative permittivity ε and permeability μ of the metamaterial anti-reflection layer for achieving perfect absorption, with the thickness of the anti-reflection layer d ₁ = 15 nm and the thickness of the α-Si:H layer d ₂ = 30 nm. The dashed lines give the numerically calculated values of the real and imaginary parts (ε _r , ε _i , μ _r , μ _i ) of ε and μ, and the solid lines give the corresponding results (ε _r ^,, ε _i ^,, μ _r ^,, μ _i ^,) fitted through the Lorentz model