Abstract
State-of-the-art metamaterials and nanoplasmonics have shown that the classical electromagnetic framework becomes inaccurate at the extreme nanoscale, where quantum effects such as nonlocality, electronic spill-in/spill-out, and Landau damping become significant. To tackle this problem, Feibelman's d parameters have been established as a surface optical response function in a recent mesoscopic electromagnetic framework.
While d parameters of Jellium simple metals can be more accurately calculated by time-dependent density functional theory, those of noble metals become computationally non-controllable due to the non-negligible screening from lower-lying orbitals.
In this study, we introduce a new method for measuring these complex dispersive surface response functions using an ellipsometer. We measure the optical responses of gold and platinum under different crystallinity in the ultraviolet to the visible regimes. Our results indicate a viable way for measuring d parameters that could be widely useful for atomic-scale optical phenomena and devices.
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