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Your search keyword '"Sándor Kökényesi"' showing total 3 results
Start Over Author "Sándor Kökényesi" Journal optical materials
3 results on '"Sándor Kökényesi"'

1. Peculiarities of holographic microfabrication of photonic structures in functional polymer nanocomposites

Author

Sándor Molnár, Sándor Kökényesi, V. Kaliabin, J. A. Burunkova, and D. Zhuk

Subjects
Materials science, Polymer nanocomposite, Holography, Physics::Optics, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, Inorganic Chemistry, law, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Spectroscopy, Wavefront, Nanocomposite, business.industry, Organic Chemistry, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Condensed Matter::Soft Condensed Matter, Polymerization, Optoelectronics, Photonics, 0210 nano-technology, business, Refractive index, Microfabrication
Abstract

Nanocomposites based on urethane-acrylate monomers stabilized at high concentration of silica nanoparticles were fabricated and investigated with the aim to produce efficient volume Bragg grating elements. Their sensitivity in the green spectral region and high modulation depth of the refractive index in the optically recorded elements are determined by the redistribution of combined monomers and silica nanoparticles, by the property of initiators of polymerization as well as by the parameters of recording process. The developed materials and methods can be used for creation of versatile photonic elements, for manipulation of optical wavefronts or beam propagation, for optical sensing.

Published
2019
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2. Temperature studies of optical parameters of (Ag3AsS3)0.6(As2S3)0.4 thin films prepared by rapid thermal evaporation and pulse laser deposition

Author

V.Yu. Izai, Y.Y. Rati, Petr Nemec, Sándor Kökényesi, Ihor Studenyak, M. Yu. Buchuk, M. M. Kutsyk, and Yu. Yu. Neimet

Subjects
Materials science, genetic structures, Analytical chemistry, 02 engineering and technology, 01 natural sciences, Spectral line, Pulsed laser deposition, Inorganic Chemistry, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, 0103 physical sciences, Dispersion (optics), Deposition (phase transition), Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Thin film, Spectroscopy, 010302 applied physics, Organic Chemistry, Atmospheric temperature range, 021001 nanoscience & nanotechnology, eye diseases, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Absorption edge, sense organs, 0210 nano-technology, Refractive index
Abstract

(Ag3AsS3)0.6(As2S3)0.4 thin films were deposited using rapid thermal evaporation (RTE) and pulse laser deposition (PLD) techniques. Ag-enriched micrometre-sized cones (RTE) and bubbles (PLD) were observed on the thin film surface. Optical transmission spectra of the thin films were studied in the temperature range 77–300 K. The Urbach behaviour of the optical absorption edge in the thin films due to strong electron–phonon interaction was observed, the main parameters of the Urbach absorption edge were determined. Temperature dependences of the energy position of the exponential absorption edge and the Urbach energy are well described in the Einstein model. Dispersion and temperature dependences of refractive indices were analysed; a non-linear increase of the refractive indices with temperature was revealed. Disordering processes in the thin films were studied and compared with bulk composites, the differences between the thin films prepared by RTE and PLD were analysed.

Published
2016
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3. Surface patterning on amorphous chalcogenide nanomultilayers

Author

A. C. Miller, Sándor Kökényesi, Himanshu Jain, Viktor Takáts, and Petr Nemec

Subjects
Materials science, Fabrication, business.industry, Atomic force microscopy, Chalcogenide, Organic Chemistry, Physics::Optics, Optical transmittance, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Pulsed laser deposition, Amorphous solid, Inorganic Chemistry, chemistry.chemical_compound, Optics, chemistry, Transmittance, Optoelectronics, sense organs, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, business, Refractive index, Spectroscopy
Abstract

The surface patterning on amorphous chalcogenide nanomultilayers was successfully performed employing laser-irradiation or electron-beam recording. Significant changes of thickness reaching up to 10% of initial values investigated by AFM are accompanied by modifications of optical transmittance and refractive index. Observed phenomena can be used for the one-step fabrication of micro-optical elements.

Published
2010
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