Optical constants of gold in the soft-x-ray region from reflection and transmission measurements

Abstract

The optical constants of gold deposited on 300-nm-thick freestanding polyimide films have been measured in the energy range of 40-1350 eV. The optical constants of the polyimide films were known from a previous investigation. By performing both transmission measurements with Kramers-Kronig analysis and multiangle reflection measurements with analysis by fitting to a Fresnel multilayer model including roughness, one could carry out a detailed error analysis. In the energy range above 500 eV systematic deviations between the results obtained by both methods were found. For gold films the discrepancies can be attributed to deviations from Beckmann-type behavior at small grazing-incidence angles.

Attostreaking with metallic nano-objects

“…It is calculated from the classical Maxwell equations using the boundary element method as implemented with the BEMAX code [62,63]. The dielectric constant of gold for 100 eV photons, ε = 0.82 + i0.073, has been taken from synchrotron radiation scattering data [64]. It is worth mentioning that for the spherical clusters with R cl = 50 and 20 nm considered in this study, using a homogeneous distribution of the XUV field at the cluster surface F as = const provides very similar streaking spectrograms.…”

Uniform Plane Wave Reflection From Pec Plane Embedded in a Nonlinear Medium

“…Reflectance measurements are also used to find optical properties such as optic axis, complex refractive index, optical constants etc. [16][17][18][19].…”