Light absorption by weakly rough metal surfaces

We study light absorption by weakly rough metal surfaces with the roughness amplitude and correlation length smaller than skin depth in metal. develop a systematic perturbative approach for calculation of absorptance such systems find that roughness-related variations are determined an interplay between several system parameters which can result, particular, greater amplitudes. show that, small-scale roughness, mainly caused roughness-induced increase effective volume surface layer, incident is predominantly absorbed. argue fluctuations different samples, even though not related to any electron scattering processes, appear as sample-to-sample Drude rate reported recent measurements dielectric function.