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DS: Fachverband Dünne Schichten

DS 24: Layer Properties II: Optical Properties

DS 24.6: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, CHE 91

Optical constants of nickel and gold from 0.06 to 6.0 eV at 300 K — •Stefan Zollner and Farzin Abadizaman — New Mexico State University, Las Cruces, NM, USA

Using spectroscopic ellipsometry, we performed high-precision measurements of the optical constants of gold and nickel thin films at room temperature from the mid-infrared to the near-ultraviolet spectral region. Gold shows typical Drude behavior in the infrared with a single species of charge carriers and several optical interband transitions with an onset of 2.54 eV. However, deviations from a simple Drude model are noticed at the longest wavelengths, possibly due to diffraction or the anomalous skin effect. For nickel, measurements were performed in UHV after preparing a clean surface by annealing in vacuum. The optical constants of Ni require a description with two species of Drude charge carriers with vastly different damping constants, and several interband transitions. The energies of the interband transitions can be determined by subtracting the Drude response from the optical constants. Several different representations of the optical constants of Ni and Au will be discussed, including a frequency dependent scattering rate and a renormalized effective mass. Tabulated optical constants as well as model line shapes fitted to the data will be presented.