On the Kramers-Kronig transform with logarithmic kernel for the reflection phase in the Drude model

Details On the Kramers-Kronig transform with logarithmic kernel for the reflection phase in the Drude model On the Kramers-Kronig transform with logarithmic kernel for the reflection phase in the Drude model

2011-11-22

arxiv.org/abs/1111.5139v1

Journal of Modern Optics 57, 16 (2010) 1504

Physics

Optics

18 pages, piblished in j. Mod. Opt. 57, 1504 (2010)

Scientific paper

10.1080/09500340.2010.506015

We use the Kramers-Kronig transform (KKT) with logarithmic kernel to obtain the reflection phase and, subsequently, the complex refractive index of a bulk mirror from reflectance. However, there remains some confusion regarding the formulation for this analysis. Assuming the damped Drude model for the dielectric constant and the oblique incidence case, we calculate the additional terms: phase at zero frequency and Blashke factor and we propose a reformulated KKT within this model. Absolute reflectance in the s-polarization case of a gold film is measured between 40 and 350 eV for various glancing angles using synchrotron radiation and its complex refractive index is deduced using the reformulated KKT that we propose. The results are discussed with respect to the data available in the literature.

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