Kramers-Kronig constrained variational analysis of optical spectra

Abstract

A universal method of extraction of the complex dielectric function $\epsilon (\omega )={\epsilon }_1(\omega )+i{\epsilon }_2(\omega )$ from experimentally accessible optical quantities is developed. The central idea is that ${\epsilon }_2(\omega )$ is parameterized independently at each node of a properly chosen anchor frequency mesh, while ${\epsilon }_1(\omega )$ is dynamically coupled to ${\epsilon }_2(\omega )$ by the Kramers-Kronig (KK) transformation. This approach can be regarded as a limiting case of the multi-oscillator fitting of spectra, when the number of oscillators is of the order of the number of experimental points. In the case of the normal-incidence reflectivity from a semi-infinite isotropic sample the new method gives essentially the same result as the conventional KK transformation of reflectivity. In contrast to the conventional approaches, the proposed technique is applicable, without readaptation, to virtually all types of linear-response optical measurements, or arbitrary combinations of measurements, such as reflectivity, transmission, ellipsometry {\it etc.}, done on different types of samples, including thin films and anisotropic crystals.

arXiv comment10 pages, 7 figures

References in corpus (6)

• Absence of a pseudogap in the in-plane infrared response of Bi2Sr2CaCu2O(8+d)
• Heavy Carriers and Non-Drude Optical Conductivity in MnSi
• Manifestation of multiband optical properties of MgB${}_2$
• Infrared and optical spectroscopy of alpha and gamma-phase Ce
• Grazing Incidence Infrared Reflectivity of La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$ and NbN
• The c-axis optical sum rule and possible new collective mode in LSCO

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