We study nonlinear wave phenomena in hyperbolic and plasma-like dielectric isotropic metamaterials, dielectric-graphene (DG), dielectric-semiconductor (DS) and dielectric-metal (DM) plasma-like media (PM) (DGPM, DSPM, DMPM, respectively). When a THz beam passes through a layered DGPM in the presence of external magnetic field, we show the ability to effectively control the resonant complex nonlinear conductivity of graphene and modulation of the beam amplitude. In the hyperbolic nonlinear active IR field concentrator, the possibilities of (i) forming three types of focused nonlinear wave structures and (ii) the quasi-chaotic behaviour of the field amplitude inside the region of focusing in the above-threshold regime are demonstrated. Non-stationary regime for incident beam is included into consideration. When pulses in the IR range impinge a layer of a planar hyperbolic metamaterial with gain-active inclusions providing resonant nonlinear dissipation, the formed wave beam demonstrates pronounced synergistic behaviour with both “absorption” and “survival” phenomena. In a multilayer DMPM operating in the THz range, the transmission of a wave beam happens with the nonlinear medium transparency, whereas the medium nonlinearity is manifested via the nonlinear conductivity/nonlinear losses. In this case, quantum effects in thin metal layers were taken into account. They led, in particular, to nonlocality of the medium response. These and other theoretically revealed effects are experimentally realizable, provided with estimates for the parameters of structures and materials, and can be useful in creating effectively controllable nonlinear modulators, limiters, concentrators, sensors, devices with harmonic generation and frequency mixing, and other devices.
Construction of graphene-based nanosensor is presented for the detection of viruses and bacteria as infectious agents. Viruses and bacteria are cause of different form of diseases. Detection mechanism for classification and identification of biological agents as well as viruses are paramount at early stages of illness. Fabrication of graphene nanosensor based on surface plasmon resonance (SPR) technique and field-effect for viruses, bacteria, proteins, and nucleic acids detection is proposed in this article.
Investigation of physical-mechanical characteristics of stomatologic materials (ceramics for crowns, silver amalgam, cements and materials on a polymeric basis) properties by the modern methods and correspondence their physical-mechanical properties to the physical-mechanical properties of native teeth is represented. The universal device "Micron-Gamma" is built for this purpose. This device allows investigate the physical-mechanical characteristics of stomatologic materials (an elastic modulus, micro-hardness, destruction energy, resistance to scratching) by the methods of continuous indentation, scanning and pricking. A new effective method as well as its device application for the investigation of surface layers of materials and their physical-mechanical properties by means of the constant indenting of an indenter is realized. This method is based on the automatic registration of loading (P) on the indenter with the simultaneous measurement of its indentation depth (h). The results of investigations are presented on a loading diagram P=f(h) and as a digital imaging on the PC. This diagram allows get not only more diverse characteristics in the real time regime but also gives new information about the stomatologic material properties. Therefore, we can to investigate the wide range of the physical-mechanical properties of stomatologic materials. "Micron-alpha" is digital detection device for light imaging applications. It enables to detect the very low material surface relief heights and restoration of surface micro topography by a sequence data processing of interferential data of partially coherent light also. "Micron-alpha" allows: to build 2D and 3D imaging of a material surface; to estimate the quantitatively characteristics of a material surface; to observe the imaging interferential pictures both in the white and in the monochromatic light; to carry out the investigation of blood cells, microbes and biological macromolecules profiles. The method allows restore 3D topography of a material surface in a real time regime. The information about the material surface at partially coherent light is contained in the visibility of interferential strips. The distinctive features of device are: the non-contact electromagnetic loader; the differential size of depth of indenter introduction into the sample, that has allowed considerably reduce a rigidity of construction; a small weight and dimensions; job in a real time regime; low cost.
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