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    1. Project # 17-79-20345: Optimization and applications of resonant effects in advanced metal-dielectric metasurfaces

    In the first part of the project we will work on development of efficient and rigorous numerical methods for simulation of certain types of metasurfaces, namely, crossed multilayer metal-dielectioc diffraction gratings with smooth or piecewise smooth profiles, which depth and periods are smaller but comparable with the wavelength. Experimental part of the project will consist, first, in a study of resonant properties of a certain type of metasurfaces representing crossed metal-dielectric (possibly multilayer) subwavelength gratings with smooth profiles and periods being modestly lower than the wavelenght (this condition does not allow to describe such structures in terms of spoof-plasmons). Second, a possibility for application of such structures for fabrication of chips for surface plasmon resonance biosensors will be considered.

    2. Project # 18-19-00684: Integrated optical nanosensors based on two-dimensional nanomaterials

    The project is supposed to use the new two-dimensional nanomaterials such as graphene, graphene oxide, boron nitride, molybdenum disulfide, and tungsten disulfide for the implementation of biosensing schemes based on the detection of biomolecules in the near field of micro- and nanoscale optical waveguides and resonators. The optical and chemical properties of these materials are well understood and it is worth noting their unique characteristics such as high transparency, which can be regulated, as well as a high reactivity with respect to a broad class of chemical and biological molecules. At the moment, it is shown that a thin film of graphene and graphene oxide can be used as a linking layers for detecting surfaces of biosensors based on surface plasmon resonance and optical fiber technology, which improves the sensitivity of detection.

    3. Project # 18-79-10208: Multifunctional metasurfaces based on hybrid graphene-metallic nanostructures

    At the first stage of the project, optimal configurations of biointerfaces, which are metasurfaces based on graphene-metal nanostructures, will be determined. The geometry and structural properties of the developed metasurfaces will be optimized depending on the type of the particular analyzed object, which may be low-molecular compounds, large biological molecules, as well as cells and their organelles. Technology will be developed for creating such graphene-metallic biointerfaces, starting from the technologies of synthesis and transfer of graphene, as well as its nanostructuring, and ending with the formation on the surface of a two-dimensional material of metallic nanostructures with given properties. The excitation conditions and the characteristics of optical resonances in hybrid nanostructures will be determined in the visible and near-infrared ranges. Special attention will be paid to the development and optimization of methods for immobilizing the analyzed objects to hybrid graphene-metal biointerfaces. At the final stage of the project, biosensing protocols will be developed for the created metasurfaces based on hybrid graphene-metallic nanostructures and their effectiveness will be demonstrated for detecting refractive index changes in the medium caused by adsorption of analytes and for using the spectroscopy of surface-enhanced Raman scattering.

    Contacts: vsv@mci.sdu.dkarsenin.av@mipt.ru
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