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001-es BibID:BIBFORM090088
035-os BibID:(cikkazonosító)120491
Első szerző:Csarnovics István (fizikus)
Cím:Surface plasmon enhanced light-induced changes in Ge-Se amorphous chalcogenide-gold nanostructures / István Csarnovics, Miklós Veres, Petr Nemec, Sándor Molnár, Sándor Kökényesi
Dátum:2021
ISSN:0022-3093
Megjegyzések:In this paper, the plasmon field enhanced light-induced changes are investigated in the amorphous Ge24Se76 layer incorporating Au nanoparticles. The presence of gold nanoobjects in amorphous chalcogenide/gold heterostructure influences the optical and structural properties, as well as volume changes of the material. It also enhances the Raman signal of the structure through surface enhancement, which allows clearer and better investigation of the glass structure and understanding of the mechanisms of surface plasmon stimulated transformations. In addition, it also enhances the recording of the optical grating pattern into the layer.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Amorphous chalcogenides
Light-induced effects
Gold nanoparticles
Surface patterns
Localized surface plasmon resonance
Surface-enhanced Raman scattering
Megjelenés:Journal Of Non-Crystalline Solids. - 553 (2021), p. 1-6. -
További szerzők:Veres Miklós Nemec, Petr Molnár Sándor (1990-) (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
BO/348/20
Egyéb
ÚNKP-20-5-DE-107
Egyéb
VEKOP-2.3.2-16-2016-00011
egyéb
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2.

001-es BibID:BIBFORM084503
035-os BibID:(cikkazonosító)100045
Első szerző:Csarnovics István (fizikus)
Cím:Surface plasmon enhanced light-induced changes in Ge Se amorphous chalcogenide : Gold nanostructures / Csarnovics István, Veres Miklós, Nemec Petr, Molnár Sándor, Kökényesi Sándor
Dátum:2020
ISSN:2590-1591
Megjegyzések:In this paper, the plasmon field enhanced light-induced changes are investigated in the amorphous Ge24Se76 layer incorporating Au nanoparticles. The presence of gold nanoobjects in amorphous chalcogenide/gold heterostructure influences the optical and structural properties, as well as volume changes of the material. It also enhances the Raman signal of the structure through surface enhancement, which allows clearer and better investigation of the glass structure and understanding of the mechanisms of surface plasmon stimulated transformations. In addition, it also enhances the recording of the optical grating pattern into the layer.
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Amorphous chalcogenides
Light-induced effects
Gold nanoparticles
Surface patterns
Localized surface plasmon resonance
Surface-enhanced Raman scattering
Megjelenés:Journal of Non-Crystalline Solids: X. - 6 (2020), p. 1-6. -
További szerzők:Veres Miklós Nemec, Petr Molnár Sándor (1990-) (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
Egyéb
MTA
BO/348/20
Egyéb
ÚNKP-20-5-DE-107
Egyéb
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DOI
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3.

001-es BibID:BIBFORM077308
Első szerző:Csarnovics István (fizikus)
Cím:Light Sensitive Plasmonic Nanostructures for Photonic Applications / Istvan Csarnovics, Attila Bonyar, Miklos Veres, Laszlo Himics, Attila Csik, Judit Kaman, Julia Burunkova, Geza Szanto, Laszlo Balazs, Sandor Kokenyesi
Dátum:2018
Megjegyzések:In this work, the performance of gold nanoparticles were investigated for stimulation of photosensitive materials for photonic applications. It was widely used for surface plasmon resonance experiments, not in the last place because of the manifestation of optical resonances in the visible spectral region. The localized surface plasmon resonance is rather easily observed in nanometer-sized metallic structures and widely used for measurements, sensing, in semiconductor devices and even in optical data storage. Firstly, gold nanoparticles on silica glass substrate satisfy the conditions for surface plasmon resonance in the green-red spectral range, where the chalcogenide glasses have the highest sensitivity. The gold nanostructures influence and enhance the optical, structural and volume changes and promote the exciton generation in gold nanoparticles/chalcogenide layer structure. The experimental results support the importance of localized electric fields in the photo-induced transformation of chalcogenide glasses as well as suggest new approaches to improve the performance of these optical recording media. Results may be utilized for direct, micrometre- or submicron size geometrical and optical pattern formation and used also for further development of the explanations of these effects in chalcogenide glasses. Besides of that, gold nanoparticles could be added to the organic light-sensitive material. The acrylate-based materials are frequently used for optical, holographic recording of optoelectronic elements due to photo-stimulated structural transformations. The holographic recording process and photo-polymerization effect could be enhanced by the localized plasmon field of the created gold nanostructures. Finally, gold nanoparticles widely used for electrochemical and optical sensor applications. Although these NPs can be synthesized in several ways, perhaps one of the simplest methods is the thermal annealing of pre-deposited thin films on glass or silicon surfaces. With this method, the parameters of the annealing process (time, temperature) and the pre-deposited thin film thickness influence and define the resulting size and distribution of the NPs on the surface. Localized surface plasmon resonance (LSPR) is a very sensitive optical phenomenon and can be utilized for a large variety of sensing purposes (chemical sensors, gas sensors, biosensors, etc.). Surface-enhanced Raman spectroscopy (SERS) is an analytical method which can significantly increase the yield of Raman scattering of target molecules adsorbed on the surface of metallic nanoparticles. The sensitivity of LSPR and SERS based devices is strongly depending on the used material and also on the size and geometry of the metallic nanoparticles. By controlling these parameters the plasmon absorption band can be tuned and the sensitivity can be optimized. The technological parameters of the generated gold nanoparticles were investigated and influence on the SERS and on the LSPR sensitivity was established. The LSPR sensitivity were simulated for gold nanocubes and nanospheres with MNPBEM Matlab toolbox. It was found that the enhancement factor (which characterize the increase in the peak shift for multi-particle arrangements compared to single-particle models) depends on the size of the nanoparticles and on the distance between the particles.
Tárgyszavak:Természettudományok Fizikai tudományok idézhető absztrakt
Megjelenés:International Journal of Physical and Mathematical Sciences. - 12 : 5 (2018), p. 1. -
További szerzők:Bonyár Attila Veres Miklós Himics László Csik Attila (1975-) (fizikus) Kámán Judit Burunkova, Julia (vegyész) Szántó Géza (1987-) (fizikus) Balázs László (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
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4.

001-es BibID:BIBFORM066918
Első szerző:Csarnovics István (fizikus)
Cím:Surface patterning in Ge-Se amorphous layers / I. Csarnovics, M. Veres, P. Nemec, M. R. Latif, P. Hawlova, S. Molnar, S. Kokenyesi
Dátum:2017
ISSN:0022-3093
Megjegyzések:Compositional and fabrication method dependences of laser-induced geometrical surface relief formation in Ge-Se amorphous layers were investigated with the aim to determine the possible role of initial conditions in the mechanism and efficiency of optical recording. The results show that pulsed laser deposition has some advantages in composition preservation and surface relief formation in comparison with thermal evaporation for producing layers with high sensitivity and efficiency of surface relief grating formation, especially in layers with Ge24Se76 composition. It was shown that modulation depth of the created surface structures increases with increasing Se content in Ge-Se amorphous chalcogenide layers. Thermal annealing has essential influence on the recording parameters, enabling additional insight into the possible mechanisms of light induced surface patterning in this type of light-sensitive amorphous chalcogenides. Raman spectroscopy was used to identify local structure of produced surface patterns.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
amorphous chalcogenides
Ge-Se system
thin films
light induced surface pattering
raman spectroscopy
atomic force microscopy
Megjelenés:Journal of Non-Crystalline Solids. - 459 (2017), p. 51-56. -
További szerzők:Veres Miklós Nemec, Petr Latif, Muhamma Rizwa Hawlova, P. Molnár Sándor (1990-) (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:TÁMOP4.2.4.A/2-11-1-2012-0001
TÁMOP
TÁMOP-4.2.2.A-11/1/KONV-2012-0036
TÁMOP
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5.

001-es BibID:BIBFORM063729
Első szerző:Csarnovics István (fizikus)
Cím:Dual Effects of Photo-Darkening and Photo-Bleaching in Ge-Se Films / István Csarnovics, Muhamma Rizwa Latif, Tyler Nichol, Wan Kuang , Maria Mitkova, Miklós Veres, Sándor Kökényesi
Dátum:2015
ISSN:2161-6213
Megjegyzések:Photo-induced changes are investigated in thermally evaporated GexSe1-x (x = 0.28, 0.33 and 0.40) films. Object of studiesare fresh (as prepared), as well as annealed films. The studies indicated concentration dependence of the occurring effects for thestudied compositions. Fast photo-darkening and slow photo-bleaching processes due to laser irradiation were detected in as-preparedfilms, while only photo-darkening effect was established for annealed samples. The origin of photo-darkening and photo-bleaching isexplained based on the structural investigations carried out by Raman spectroscopy.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
chalcogenides
photo-induced changes,
photo-bleaching
photo-darkening
micro-Raman spectroscopy
Megjelenés:Journal of Materials Science and Engineering A. - 5 : 2 (2015), p. 78-86. -
További szerzők:Latif, Muhamma Rizwa Nichol, Tyler Kuang, Wan Mitkova, Maria Veres Miklós Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:TÁMOP 4.2.4. A/2-11-1-2012-0001
TÁMOP
TÁMOP-4.2.2.A-11/1/KONV-2012-0036
TÁMOP
Internet cím:Szerző által megadott URL
DOI
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