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Faculty of Sciences and Mathematics Banja Luka, University of Banja Luka , Banja Luka , Bosnia and Herzegovina
Faculty of Sciences, Novi Sad, Vojvodina, University of Novi Sad , Novi Sad , Serbia
This paper presents a model of molecular ultrathin (nano) crystalline film and feature research methodology of exciton system as well as analysis of dielectric properties of these spatially very restricted structures with perturbed fundamental parameters on surfaces. Using the two-time Green's functions, adapted for research of symmetry breaking crystalline structures, and graphical-numerical software, the dynamic permittivity along the direction vertical to the boundary surface of the film was calculated. It was shown that the appearance and the presence of localized states in the surfaces and in the boundary layers of the film depend on the thickness of the film and the changing values of parameters in the border areas of the film. These localized states define schedule and determine the number of (discrete and selective) resonant absorption lines in the near infrared area of the external electromagnetic radiation, which occur in the ultrathin structure instead of continuous absorption area in the bulk structure of the same chemical and crystallographic structure. It is important fact in (nano)optical engineering as well as in nanomedicine, i.e. nanopharmacy – for construction of nanomarkers, nanocarriers and nanodelivers of medical drugs.
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