Kramers-Kronig constrained variational analysis of optical spectra
By A.B.Kuzmenko. 2005
456 citations recorded by the source corpus.
A universal method of extraction of the complex dielectric function ǫ ( ω ) = ǫ 1 ( ω ) + iǫ 2 ( ω ) from experimentally accessible optical quantities is developed. The central idea is that ǫ 2 ( ω ) is param-eterized independently at each node of a properly chosen anchor frequency mesh, while ǫ 1 ( ω ) is dynamically coupled to ǫ 2 ( ω ) 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 etc. , done on different types of samples, including thin films and anisotropic crystals.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/8f2b495f40b20318636de4c91c7920a33fa3870c
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Nonlinear light–matter interaction at terahertz frequencies (2016, methodology): “The spectra were then modeled with Kramers–Kronig (KK) consistent variational dielectric function fits [151], yielding the time- and frequency-dependent optical conductivity.”
- A sudden collapse in the transport lifetime across the topological phase transition in (Bi1−xInx)2Se3 (2012, methodology): “The data is fit by a Drude-Lorentz model by utilizing the RefFIT program[20].”