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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Vydáno v:Optical materials express Ročník 12; číslo 7; s. 2855
Hlavní autoři: Dutta, Arpan, Tiainen, Ville, Qureshi, Hassan Ali, Duarte, Luís, Toppari, J. Jussi
Médium: Journal Article
Jazyk:angličtina
Vydáno: Washington Optical Society of America 01.07.2022
Témata:
Absorption spectra
Oscillators
Rhodamine 6G
Spectroellipsometry
Thin films
ISSN:2159-3930, 2159-3930
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Shrnutí: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.
Bibliografie:ObjectType-Article-1
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ISSN:2159-3930
2159-3930
DOI:10.1364/OME.459938