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Determination of scattering and Urbach absorption contributions to the light extinction in PTFE films by using graphical representation technique and numerical solution of the inverse problem

  • Ellipsometrically obtained spectral dependences of ordinary αxy and extra-ordinary αz extinction/attenuation coefficients within the spectral range λ = 300…980 nm of uniaxially anisotropic polytetrafluoroethylene (PTFE) films were analyzed. We considered the capabilities and specific features of the graphical representation technique for determining the contribution of Rayleigh scattering and Urbach absorption to light attenuation in the spectral range beyond fundamental absorption. It has been shown that the graphical approach enables to estimate these contributions qualitatively, semi-quantitatively or quantitatively, depending on the situation. The conclusions made using the analysis of graphical representation are confirmed by numerical solution of the inverse problem via simulation of the αxy (λ), αz (λ) experimental dependences within the framework of a best-fit procedure. Being based on both of these approaches, we have ascertained that, in the as-prepared PTFE films, the so-called anomalous light scattering (ALS) with the spectral dependence of scattering coefficient αs ≈ as λ–p (p > 4) takes place. Transformation of scattering from ALS to the Rayleigh one with p ≈ 4 due to annealing is accompanied by an increase of Urbach (subband) absorption. Both of these factors cause narrowing the dynamic range of extinction coefficient values. Both scattering and absorption coefficients are higher for the component of light polarized along the normal to the substrate as compared to the component polarized in parallel to it. The relationship between observed behavior of the scattering and absorption coefficients and the film structure has been discussed.

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Metadaten
Author:Mykola Sopinskyy, Kostyantyn GrytsenkoORCiD, Claus VillringerORCiD, Yurii KolomzarovORCiD, Sigurd SchraderORCiD
URN:urn:nbn:de:kobv:526-opus4-18035
DOI (Version of Record):https://doi.org/10.15407/spqeo26.03.303
ISSN:1605-6582
Parent Title (English):Semiconductor Physics, Quantum Electronics & Optoelectronics
Publisher:National Academy of Sciences of Ukraine. Institute for Semiconductor Physics
Place of publication:Kyiv
Document Type:Article
Language:English
Year of Publication:2023
Publishing Institution:Technische Hochschule Wildau
Release Date:2023/10/04
Tag:Rayleigh scattering; Urbach tail; absorption coefficient; ellipsometry; graphical method; polytetrafluoroethylene; scattering coefficient
Volume:26
Issue:3
First Page:303
Last Page:314
Source:Sopinskyy, M. V., Grytsenko, K., Villringer, C., Kolomzarov, Yu. V., & Schrader, S. (2023). Determination of scattering and Urbach absorption contributions to the light extinction in PTFE films by using graphical representation technique and numerical solution of the inverse problem. Semiconductor Physics, Quantum Electronics & Optoelectronics, 26(3), 303–314. doi:10.15407/spqeo26.03.303
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 621 Angewandte Physik
Licence (German):Creative Commons - CC BY-ND - Namensnennung - Keine Bearbeitungen 4.0 International
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