A1 Refereed original research article in a scientific journal
Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model
Authors: Dutta Arpan, Tiainen Ville, Qureshi Hassan Ali, Duarte Luís, Toppari J. Jussi
Publisher: Optica Publishing Group
Publication year: 2022
Journal: Optical Materials Express
Journal name in source: OPTICAL MATERIALS EXPRESS
Journal acronym: OPT MATER EXPRESS
Volume: 12
Issue: 7
First page : 2855
Last page: 2869
Number of pages: 15
ISSN: 2159-3930
DOI: https://doi.org/10.1364/OME.459938
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/176026594
Optical constants of organic thin films can be evaluated using the Lorentz oscillator model (LOM) which fails to fit inhomogeneously broadened absorption of highly concentrated molecular films. In modified LOM (MLOM), the inhomogeneous broadening is implemented through a frequency-dependent adjustable broadening function. In this work, we evaluate the optical constants of rhodamine 6G doped poly-vinyl alcohol thin films with varying doping concentration (including also extensively high concentrations) using MLOM, which outperforms LOM by showing a better agreement with the experimental results. Our proposed method provides a way to accurately determine optical constants of isotropic organic thin films only from their absorption spectra without spectroscopic ellipsometry.
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