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 |