M. Vasnetsov | National Academy of Sciences of Ukraine (original) (raw)

Papers by M. Vasnetsov

Photorefractive Materials, Effects And Devices Prm'93

Oscillation in double phase conjugate mirror [1] with the local response medium (unshifted gratin... more Oscillation in double phase conjugate mirror [1] with the local response medium (unshifted gratings) is possible under following conditions [2]: 1) frequency detuning of oscillation waves with respect to the incident pump waves and 2) angular deviation of oscillation waves from strictly counterpropagation direction with respect to the pump waves.

international quantum electronics conference, 1996

Journal of Thoracic Oncology, 2021

Ukrainian Journal of Physical Optics, 2021

Spectrochimica Acta Part B: Atomic Spectroscopy, 1981

In this report we consider the elaboration of dye-doped POLIPHEM [1] (POlymer Liquid-crystal Poly... more In this report we consider the elaboration of dye-doped POLIPHEM [1] (POlymer Liquid-crystal Polymer Holograms Electrically Manageable) holo-graphic material for the creation of distributed-feedback laser. The manufacturing of electrically switchable holograms was performed by the process of photopolymerization and subsequent induced phase separation from an initially homogenous pre-polymer-liquid crystal mixture in the interference pattern of UV radiation. Stable gratings consist from the alternating planes of polymer network and regions of almost pure liquid-crystal regions filling the whole volume between the polymer walls without droplets formation. In POLIPHEM gratings, nematic liquid crystal molecules located between the polymer stripes are well aligned normal to the polymer-liquid crystal interface planes. Under the application of an external voltage, a strong variation of the refraction index modulation occurs due to the reorientation of the LC molecules [2]. Theoretical ana...

Soft material templating is a promising approach for assembling and manipulating nanoparticles st... more Soft material templating is a promising approach for assembling and manipulating nanoparticles structures. Due to the high sensitivity of soft matter systems to external stimuli, such composite materials exploit the soft surrounding medium to move or to reconfigure nano-structures or nano-objects as well as to tune their own properties. The use of topological defects in anisotropic fluids has been recently reported. Here, arrays of defect lines are created in planar-periodic nematic liquid crystal cells, wherein the nematic director undergoes static twist deformations separated by topological defects. Trapping and manipulation of the nanoparticles in disclinations are demonstrated and investigated by confocal fluorescence microscopy exploiting quantum dots. Nanoparticles gathering is observed during electrically controlled switching from orientational topological walls to disclinations. The external field is also used to perform displacement and deformation of the nanoparticles arra...

2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)

Wave propagation in metamaterials with different structure scales is analyzed with account of non... more Wave propagation in metamaterials with different structure scales is analyzed with account of nonlinear effects. We introduce topological nonlinearity and magnetooptical control over nonlinear strongly localized bullet-like structures with phase singularities.

Journal of Molecular Liquids

Molecular Crystals and Liquid Crystals, 2008

We report a study devoted to the creation of a distributed feedback device on a basis of waveguid... more We report a study devoted to the creation of a distributed feedback device on a basis of waveguide with periodical composition polymer - liquid crystal. Due to the refractive indices difference between the components the Bragg diffraction grating is formed, which provides coupling of the forward and backward propagating waves. The influence of the gain and conditions of laser oscillation threshold are analyzed for gain-type reflection grating. The conclusion is done on the advantage of second-order Bragg diffraction exploitation. Numerical simulations demonstrated the stability of the waveguide mode.

Proceedings of 5th European Quantum Electronics Conference, 2000

ABSTRACT

A structure of wavefront edge dislocations and associated “transversal” optical vortices in an in... more A structure of wavefront edge dislocations and associated “transversal” optical vortices in an interference field of two two-dimensional Gaussian beams is analyzed. It was shown that the optical vortex rotation is directed toward the area of higher phase velocity in the interference field (the origin of the phase velocity variation is due to the Gouy effect). The conditions for the

Soviet Journal of Quantum Electronics, 1985

In a \mathcal Q-switched YAG:Nd3+ laser utilizing a three-mirror resonator a reproducible structu... more In a \mathcal Q-switched YAG:Nd3+ laser utilizing a three-mirror resonator a reproducible structure of regular fluctuations was obtained with a period corresponding to the reciprocal of the width of the lasing spectrum. When the optical lengths of the partial resonators were not submultiples of the total length, random intensity fluctuations over the entire duration of the giant lasing pulse were observed. Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Abstract Text Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints

Applications of Light with Orbital Angular Momentum, 2011

Photorefractive Materials, Effects And Devices Prm'93

Oscillation in double phase conjugate mirror [1] with the local response medium (unshifted gratin... more Oscillation in double phase conjugate mirror [1] with the local response medium (unshifted gratings) is possible under following conditions [2]: 1) frequency detuning of oscillation waves with respect to the incident pump waves and 2) angular deviation of oscillation waves from strictly counterpropagation direction with respect to the pump waves.

international quantum electronics conference, 1996

Journal of Thoracic Oncology, 2021

Ukrainian Journal of Physical Optics, 2021

Spectrochimica Acta Part B: Atomic Spectroscopy, 1981

In this report we consider the elaboration of dye-doped POLIPHEM [1] (POlymer Liquid-crystal Poly... more In this report we consider the elaboration of dye-doped POLIPHEM [1] (POlymer Liquid-crystal Polymer Holograms Electrically Manageable) holo-graphic material for the creation of distributed-feedback laser. The manufacturing of electrically switchable holograms was performed by the process of photopolymerization and subsequent induced phase separation from an initially homogenous pre-polymer-liquid crystal mixture in the interference pattern of UV radiation. Stable gratings consist from the alternating planes of polymer network and regions of almost pure liquid-crystal regions filling the whole volume between the polymer walls without droplets formation. In POLIPHEM gratings, nematic liquid crystal molecules located between the polymer stripes are well aligned normal to the polymer-liquid crystal interface planes. Under the application of an external voltage, a strong variation of the refraction index modulation occurs due to the reorientation of the LC molecules [2]. Theoretical ana...

Soft material templating is a promising approach for assembling and manipulating nanoparticles st... more Soft material templating is a promising approach for assembling and manipulating nanoparticles structures. Due to the high sensitivity of soft matter systems to external stimuli, such composite materials exploit the soft surrounding medium to move or to reconfigure nano-structures or nano-objects as well as to tune their own properties. The use of topological defects in anisotropic fluids has been recently reported. Here, arrays of defect lines are created in planar-periodic nematic liquid crystal cells, wherein the nematic director undergoes static twist deformations separated by topological defects. Trapping and manipulation of the nanoparticles in disclinations are demonstrated and investigated by confocal fluorescence microscopy exploiting quantum dots. Nanoparticles gathering is observed during electrically controlled switching from orientational topological walls to disclinations. The external field is also used to perform displacement and deformation of the nanoparticles arra...

2021 Fifteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)

Wave propagation in metamaterials with different structure scales is analyzed with account of non... more Wave propagation in metamaterials with different structure scales is analyzed with account of nonlinear effects. We introduce topological nonlinearity and magnetooptical control over nonlinear strongly localized bullet-like structures with phase singularities.

Journal of Molecular Liquids

Molecular Crystals and Liquid Crystals, 2008

We report a study devoted to the creation of a distributed feedback device on a basis of waveguid... more We report a study devoted to the creation of a distributed feedback device on a basis of waveguide with periodical composition polymer - liquid crystal. Due to the refractive indices difference between the components the Bragg diffraction grating is formed, which provides coupling of the forward and backward propagating waves. The influence of the gain and conditions of laser oscillation threshold are analyzed for gain-type reflection grating. The conclusion is done on the advantage of second-order Bragg diffraction exploitation. Numerical simulations demonstrated the stability of the waveguide mode.

Proceedings of 5th European Quantum Electronics Conference, 2000

ABSTRACT

A structure of wavefront edge dislocations and associated “transversal” optical vortices in an in... more A structure of wavefront edge dislocations and associated “transversal” optical vortices in an interference field of two two-dimensional Gaussian beams is analyzed. It was shown that the optical vortex rotation is directed toward the area of higher phase velocity in the interference field (the origin of the phase velocity variation is due to the Gouy effect). The conditions for the

Soviet Journal of Quantum Electronics, 1985

In a \mathcal Q-switched YAG:Nd3+ laser utilizing a three-mirror resonator a reproducible structu... more In a \mathcal Q-switched YAG:Nd3+ laser utilizing a three-mirror resonator a reproducible structure of regular fluctuations was obtained with a period corresponding to the reciprocal of the width of the lasing spectrum. When the optical lengths of the partial resonators were not submultiples of the total length, random intensity fluctuations over the entire duration of the giant lasing pulse were observed. Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Abstract Text Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints

Applications of Light with Orbital Angular Momentum, 2011