doi: 10.1364/AO.30.002807.
Optical constants of very thin gold films in the soft x-ray region
- PMID: 20700279
- DOI: 10.1364/AO.30.002807
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Optical constants of very thin gold films in the soft x-ray region
Appl Opt.
.
Abstract
The optical constants, delta = 1 - n and k, of very thin gold films have been determined from the reflectance data obtained in the soft x-ray region of 60-900 eV. The gold films were prepared to various thicknesses, d = 49 - 270 A, by ion beam sputtering (IBS) and electron beam evaporation (EB). A plane parallel slab model with due considerations for the surface and the interface roughness was employed to analyze the reflectance data by least-squares curve fitting. The optical constants determined for the IBS samples definitely show their dependence on the film thickness. It is also found that delta of the 201-A thick IBS film is smaller by 10% than that of the EB film of 212 A thick.
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