Abstract
A microscopic theory of dielectrical 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 has been shown that two types of excitations can occur: bulk and surface exciton states. Analysis of the optical properties of these crystalline systems for low exciton concentration shows that the permittivity strongly depends on boundary parameters and the thickness of the film. Conditions for the appearance of localized exciton states have been especially analyzed.
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Acknowledgments
Research for this article was supported in part by the Junior Faculty Development Program, which is funded by the Bureau of Educational and Cultural Affairs (ECA) of the United States Department of State, under authority of the Fulbright-Hays Act of 1961 as amended and administered by American Councils for International Education: ACTR/ACCELS. The opinion expressed herein is the author's own and do not necessarily express the views of the either ECA or American Councils.
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Vucenovic, S., Ilic, D., Setrajcic, J. et al. Permittivity in Molecular Nanofilms. MRS Online Proceedings Library 1017, 64–69 (2007). https://doi.org/10.1557/PROC-1017-DD08-29
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DOI: https://doi.org/10.1557/PROC-1017-DD08-29