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We study the temperature-dependent optical properties of gold over a broadenergy spectrum covering photon energies below and above the interbandthreshold. We apply a semi-analytical Drude-Lorentz model withtemperature-dependent oscillator parameters. Our approximations are based onthe distribution of electrons over the active bands with a density of statesprovided by density functional theory. This model can be easily adapted toother materials with similar band structures and can also be applied to thecase of occupational nonequilibrium. Our calculations show a strong enhancementof the intraband response with increasing electron temperature while theinterband component decreases. Moreover, our model compares well with densityfunctional theory-based calculations for the reflectivity of highly excitedgold and reproduces many of its key features. Applying our methods to thinfilms shows a sensitive nonlinear dependence of the reflection and absorptionon the electron temperature. These features are more prominent at small photonenergies and can be highlighted with polarized light. Our findings offervaluable insights for modeling ultrafast processes, in particular, the pathwaysof energy deposition in laser-excited samples.

An adaptive model for the optical properties of excited gold