Hello every one. I want to design a suitable Metamaterial Absorber that absorbs a special wavelength(for example near IR) or a wide range of electromagnetic spectrum(Visible Spectrum). But it is tricky for me to get the exact parameters such as width, length, thickness and materials to design. One way is obtaining a suitable Circuit Model of Metamaterial Absorbers and I want to get that. please help me how can I get it?

Thanks.