A5019471902- Photonic Crystals and Applications
- Liquid Crystal Research Advancements
- Optical Polarization and Ellipsometry
- Photonic and Optical Devices
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Graphene and Nanomaterials Applications
- Lanthanide and Transition Metal Complexes
- Plant and animal studies
- Hydrogels: synthesis, properties, applications
- Characterization and Applications of Magnetic Nanoparticles
- Quantum optics and atomic interactions
- Optical and Acousto-Optic Technologies
- Photorefractive and Nonlinear Optics
- Lubricants and Their Additives
- Diamond and Carbon-based Materials Research
- Nonlinear Optical Materials Studies
- Metamaterials and Metasurfaces Applications
- Terahertz technology and applications
- Advanced Antenna and Metasurface Technologies
- Electrohydrodynamics and Fluid Dynamics
- Chalcogenide Semiconductor Thin Films
- Supramolecular Self-Assembly in Materials
Yerevan State University
2012-2024
Institute of Chemical Physics NAS RA
2021-2024
The evolution of dynamic processes in graphene-family materials are great interest for both scientific purposes and technical applications. Scanning electron microscopy transmission outstand among the techniques that allow observing controlling such real time. On other hand, functionalized graphene oxide emerges as a favorable candidate from an investigation due to its distinctive properties, encompass large surface area, robust thermal stability, noteworthy electrical mechanical properties...
In our paper, the magneto-optical properties of a dichroic cholesteric liquid crystal layer with large values parameter g and low dielectric permittivity were investigated. The solutions dispersion equation their peculiarities investigated in detail. specific reflection, transmission, absorption, rotation, ellipticity spectra also azimuth eigen polarization existence tunable linear nonreciprocal transmission band was shown.
Oblique propagation of light through a planar layer cholesteric liquid crystal (CLC) is solved by Ambartsumian's modified addition method. Two cases are considered, namely, the case when dielectric boundaries have minimum influence on transmission and CLC in vacuum. It shown that first total internal reflection can happen for fast eigen-mode at large incidence angles. New important features (transmission) spectra, photonic density states accumulated energy studied. The localisation...
In this paper, we investigate the light absorption in helically structured photonic crystals (HSPCs) an external static magnetic field case when parameter of magneto-optical activity is a function wavelength. We and compare spectra absorption, imaginary parts wave vectors forward propagating eigenwaves, azimuth φ ellipticity e total excited HSPC layer at its input surface for diffracting eigenwaves both absence presence and, finally, absorption. All features are considered detail, their...
Abstract The operation of the metasurface based on silicon cylindrical rings coated by a gold as terahertz (THz) bandpass filter/antireflection structure is studied. decrease in reflectance conditioned destructive interference electromagnetic waves reflected from structural layers metasurface. An efficient antireflection band with below 10% formed frequency spectrum 0.71–0.92 THz relative bandwidth 26%. It shown that operating suggested can be varied changing total radius rings, whereas...
Cholesteric liquid crystals (CLCs) with induced defects are one of the most prominent materials to realize compact, low-threshold and tunable coherent light sources. In this context, investigation optical properties defect modes in such CLCs is great interest. particular, many studies have been devoted spectral control depending on their thickness, properties, distribution along CLC, etc. paper, we investigate lasing possibilities a dye-doped polymer layer embedded wedge-shaped CLC. We show...
The properties of chiral photonic crystals with a pitch gradient were investigated both experimentally and theoretically. liquid-crystalline cell was prepared by bringing two cholesteric liquid (CLCs) different pitches into contact. There are some essential features in the dynamics diffusion between CLCs. most important feature is fact that establishing final equilibrium (for temperatures below 17°C) takes long time—roughly 3 months or more—which, turn, allows us to investigate nonstandard...
Abstract This paper experimentally demonstrated that in the cholesteric liquid-crystalline films it is possible to induce defect, which can be controlled by external electric field. Three cases of induced defects were examined and main result experiment rotation polarization plane has maximum value when light first propagates through chiral photonic structure then falls anisotropic layer. We have also supporting calculations, showing an agreement between experimental results theoretical...
The possibility of defects induction controlled by external electric field was experimentally demonstrated in the cholesteric liquid-crystalline films with selective reflection visible range light. It verified that due to induced defect it is possible control rotation polarization plane light propagating through structure. investigation three types near input substrate, centre and exit substrate film done. basic result experiment maximum value observed when after chiral photonic structure...
(2020). Lasing peculiarities in cholesteric multilayer structure with dye-doped polymer film depending on the concentration of laser dye and pumping energy. Molecular Crystals Liquid Crystals: Vol. 713, OPTICS OF LIQUID CRYSTALS 2019, Quebec, Canada, pp. 15-25.
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We investigated the features of optical properties magnetoactive cholesteric liquid crystals (CLCs) in an external static magnetic field. The boundary-value problem light transmission through a finite layer CLC at normal incidence and reflection from half-space is considered. also evolution with change azimuth ellipticity incident light. Some spectra, rotation, polarization ellipticity, as well spectrum eigen polarizations, are investigated, too. peculiarities polarizations due to...
Spectral properties of the three-layered wedge-cell system two identical cholesteric layers with an isotropic defect (dye-doped polymer layer) between them were investigated experimentally and theoretically. It was shown that multiple modes can be observed in this kind system.s photonic bandgap which widen application range mentioned above such as low threshold lasing, multi-position trigger, multiwavelength filters, light shutters, etc. Supporting simulation also provided showing agreement...
The colloidal 2D materials based on graphene and its modifications are of great interest for the formation LC phases. These phases allow to control orientational order particles paving way efficient processing family with anisotropic properties. From perspective potential applications, outstand functionalized oxide LCs. Here, we present peculiarities amino acidic functionalization GO along phase. We discuss influence pH (neutral, acidic, basic) GOLC ultimately showing pH-dependent behavior...