Infrared Reflectance Kramers-Kronig Analysis by Anchor-Window Technique
S. Tumėnasa, I. Kašalynasa, V. Karpusa and H. Arwinb
aCenter for Physical Sciences and Technology, Semiconductor Physics Institute, A. Goštauto 11, 01108 Vilnius, Lithuania
bDepartment of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden
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An algorithm for the Kramers-Kronig analysis of the reflectivity spectra, based on an anchor-window technique is presented. The high-frequency asymptote, required for the Kramers-Kronig analysis, is determined by minimizing differences between the Kramers-Kronig-deduced optical constants of a system under investigation and known optical constants measured in a small anchor-window. The algorithm is illustrated by applying it for a reconstruction of the optical conductivity σ(ω) of the fci-ZnMgRE quasicrystals in the spectral range of 0.01-6.5 eV from the experimental IR Fourier-transform: reflectivity data and the experimental spectral ellipsometry VIS-UV data. The reliability of the suggested Kramers-Kronig analysis technique is confirmed by independent infrared spectral ellipsometry σ(ω) measurements for fci-ZnMgRE.
DOI: 10.12693/APhysPolA.119.140
PACS numbers: 71.23.Ft, 78.20.Ci