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

Author:

Dutta Arpan1,Tiainen Ville1,Qureshi Hassan Ali12,Duarte Luís13,Toppari J. Jussi1

Affiliation:

1. University of Jyväskylä

2. University of Turku

3. University of Helsinki

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.

Funder

Academy of Finland

Publisher

Optica Publishing Group

Subject

Electronic, Optical and Magnetic Materials

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