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Infrared Reflectance Kramers-Kronig Analysis by Anchor-Window Technique

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Tumėnas S., Kašalynas I., Karpus V., Arwin H.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
140-142
EN
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.
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Optical Response of fci-ZnMgHo Quasicrystal

64%
Karpus V., Babonas G., Rėza A., Suchodolskis A., Tumėnas S., Hunderi O., Assmus W., Brűhne S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
1005-1008
EN
The results of an optical spectroscopy study of the icosahedral fci-ZnMgHo quasicrystal are presented. The dielectric function of the quasicrystal was measured by the spectroscopic ellipsometry technique in the spectral range of 0.1-5.0 eV. The analysis of the dielectric function shows that an optical response of fci-ZnMgHo is a superposition of the free-electron Drude-type contribution and that of the interband transitions across the fci-ZnMgHo pseudogap.
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