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Boundary Influence on Permittivity in Molecular Films

100%
Vučenović S., Šetrajčić J., Mirjanić D., Škipina B.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
963-968
EN
A microscopic theory of optical properties of thin molecular films, i.e. quasi 2D systems bounded by two surfaces parallel to XY planes was formulated. Harmonic exciton states were calculated using the method of two-time, retarded, temperature dependent Green's functions. It was shown that two types of excitations can occur: bulk and surface exciton states. Analysis of the optical properties (i.e. dielectrical permittivity) of these crystalline systems for low exciton concentration shows that the permittivity strongly depends on boundary parameters and the thickness of the film. Influences of boundary conditions on optical characteristics of these nanostructures were especially analyzed.
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Changes in Optical Properties of Molecular Nanostructures

76%
Vučenović S., Šetrajčić J., Markoski B., Mirjanić D., Pelemiš S., Škipina B.
Acta Physica Polonica A
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2010
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vol. 117
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issue 5
764-767
EN
This paper represents an overview about exciton systems in the molecular nanostructures (ultra thin films and superlattices) and their implications on optical properties, primarily on absorption coefficient, which is given in the form of dielectric permittivity. With utilization of Green's function method, we have calculated dispersion law, spectral weight of exciton states and dielectric permittivity for every type of nanostructures. All obtained results are compared with optical properties in bulk crystals. Dielectric permittivity in all types of nanostructures shows very narrow and discrete dependence of external electromagnetic field frequency, which is a consequence of the expressed quantum effects, very thin thickness in these structures (or at least one dimension confinement) and boundary conditions.
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