A1 Journal article (refereed)
Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model (2022)


Dutta, A., Tiainen, V., Qureshi, H. A., Duarte, L., & Toppari, J. J. (2022). Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model. Optical Materials Express, 12(7), 2855-2869. https://doi.org/10.1364/OME.459938


JYU authors or editors


Publication details

All authors or editorsDutta, Arpan; Tiainen, Ville; Qureshi, Hassan Ali; Duarte, Luís; Toppari, J. Jussi

Journal or seriesOptical Materials Express

eISSN2159-3930

Publication year2022

Publication date29/06/2022

Volume12

Issue number7

Pages range2855-2869

PublisherOptica Publishing Group

Publication countryUnited States

Publication languageEnglish

DOIhttps://doi.org/10.1364/OME.459938

Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/82711


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.


Keywordsthin filmspolymerscolouring agentsdoping (semiconductor technology)optical propertiesmodelling (representation)


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Ministry reportingYes

Reporting Year2022

JUFO rating1


Last updated on 2024-15-06 at 00:27