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A simple analytic model for the optical properties of gold is proposed. The model includes a minimum set of parameters necessary to represent the complex dielectric function of gold in the visible and near-uv regions. Explicit values for the parameters to reproduce the Johnson and Christy data Phys. Rev. B 6, 4370 (1972) on the optical properties of gold are provided.
Etchegoin et al. (Tue,) studied this question.