Discrete and selective absorption in crystalline molecular nanofilms
Recent research in nano-optical engineering and in nanomedicine as well, seeks for methods of construction of various types of nano-markers, nano-carriers, and ways to deliver drugs to the exactly determined regions of body. In this process it is important to find methods of recognition of certain types of molecules. It is obvious that optical recognition would be the easiest and the most effective way to do it. Our research presents a model of a molecular ultrathin crystalline film and generated exciton system inside it and corresponding methodology of analysis of their optical characteristics. Properties of these spatially very restricted structures are very sensitive to their surrounding surfaces. Using the two-time Green’s functions adapted for crystalline structures with symmetry breaking, and graphical-numerical software, we have calculated the energy spectra and possible exciton states. We have shown that the appearance and the presence of localized states on the surfaces and in the boundary layers of the film depend on the thickness of the film and the film surroundings, presented through the perturbation of parameters on surfaces. Optical properties in these structures demonstrate discrete and very selective resonant absorption spectra, depending on the perturbation on their surfaces.
KeywordsExcitons Thin film Green’s functions Localized states Permittivity
This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grants: OI–171039 and TR–34019) and by the Provincial Secretariat for High Education, Science and Technological Development of Vojvodina (Grant: 114-451-2092/2016) as well as by the Ministry of Science and Technological Development of the Republic of Srpska (Grant: 19/6-020/961-16/15).
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