Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model

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 adjustab...

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Published in:Optical materials express Vol. 12; no. 7; p. 2855
Main Authors: Dutta, Arpan, Tiainen, Ville, Qureshi, Hassan Ali, Duarte, Luís, Toppari, J. Jussi
Format: Journal Article
Language:English
Published: Washington Optical Society of America 01.07.2022
Subjects:
Absorption spectra
Oscillators
Rhodamine 6G
Spectroellipsometry
Thin films
ISSN:2159-3930, 2159-3930
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Abstract 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.
AbstractList 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.
Author Duarte, Luís
Toppari, J. Jussi
Qureshi, Hassan Ali
Dutta, Arpan
Tiainen, Ville
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SubjectTerms Absorption spectra
Oscillators
Rhodamine 6G
Spectroellipsometry
Thin films
Title Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model
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