CCL

Összesen 6 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM077319
Első szerző:Bonyár Attila
Cím:Coupled surface plasmon resonance on gold nanocubes - investigation by simulation / Attila Bonyár, Géza Szántó, István Csarnovics
Dátum:2016
Megjegyzések:The refractive index sensitivity of coupled plasmonic nanostructures, namely gold nanocubes in various arrangements, were simulated with the MNPBEM Matlab toolbox. The size of the cubes, the distance between the particles were the running parameters. It was found that the enhancement factor (which characterize the increase in the peak shift for multi-particle arrangements compared to single-particle models) is an exponential function of (D/a) where D is the gap between the particles and a is the edge length of the cube. It was also found that significant plasmonic coupling effects starts below 0.5 D/a for cubical nanoparticles.
ISBN:978-1-5090-4445-0
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák tanulmány, értekezés
Megjelenés:2016 IEEE 22nd International Symposium for Design and Technology in Electronic Packaging (SIITME). - p. 139-141. -
További szerzők:Szántó Géza (1987-) (fizikus) Csarnovics István (1986-) (fizikus)
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM077307
Első szerző:Bonyár Attila
Cím:Simulation and characterization of the bulk refractive index sensitivity of coupled plasmonic nanostructures with the enhancement factor / Bonyár Attila, Csarnovics István, Szántó Géza
Dátum:2018
ISSN:1569-4410
Megjegyzések:he bulk refractive index (RI) sensitivity of coupled plasmonic nanostructures, namely gold and silver nanospheres and nanocubes in two-particle (dimer) arrangements, were simulated with the MNPBEM Matlab toolbox. The size of the nanoparticles (10?90?nm) and their separation distance were the running parameters. The enhancement factor (which characterizes the increased RI sensitivity of multi-particle arrangements compared to single particles) was introduced and used to evaluate the effect of particle coupling on the bulk RI sensitivity of the dimer arrangements. The enhancement factor is an exponential function of (D/D0), where D is the separation between the particles and D0 is the diameter of the spheres or the edge length of the cubes, and it was found that significant plasmonic coupling effects (e.g. EF?>?1.5) starts below 0.5-0.3 D/D0 for the investigated dimers, depending on their size. It was also found for the four investigated dimer arrangements (gold/silver nanospheres/nanocubes) that the absolute peak shift and the enhancement factor values are inversely proportional: the dimers which have a larger absolute extinction peak shift (at the same particle separation) have smaller relative enhancement compared to single particles.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Photonics and Nanostructures - Fundamentals and Applications. - 31 (2018), p. 1-7. -
További szerzők:Csarnovics István (1986-) (fizikus) Szántó Géza (1987-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

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
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

4.

001-es BibID:BIBFORM118404
035-os BibID:(cikkazonosító)2302967 (WoS)001155098500001 (Scopus)85183720162
Első szerző:Szántó Géza (fizikus)
Cím:Optimization of the Bulk Refractive Index Sensitivity of Silver NanoPrisms / Géza Szántó, Pia Pritzke, Jonas Jakobus Kluitmann, Johann Michael Köhler, Andrea Csáki, Wolfgang Fritzsche, István Csarnovics, Attila Bonyár
Dátum:2024
ISSN:2195-1071
Megjegyzések:The sensitivity and optical properties of silver nanoprisms (triangular plateswith round-truncated corners) are investigated in this paper. Results ofboundary element method simulations are compared with experimentalresults and literature data. Based on electron microscopy images of thesynthesized nanoprisms, a single-particle model is set up for simulations withthree running parameters: edge length, thickness, and roundness (defined asthe radius of the circumscribed circle divided by the edge length). Thesegeometric parameters can be optimized during chemical synthesis to createsensors with improved sensitivity. The effect of biomolecular layers is alsoinvestigated. As a novel approach to improve the agreement between thesimulated and experimentally measured extinction spectra, the single-particlemodel is extended to consider the variation of the prisms' parameters in theform of distributions. The resulting extinction cross-section spectracorrespond well with the experimental data. The calculated bulk refractiveindex sensitivity is 670 nm/RIU (RIU stands for refractive index unit) for thesingle particle model (length=150 nm, thickness=10 nm, and roundness=0.1), while (690?5) nm/RIU for the extended model. The presented modeland obtained relations between sensitivity and geometry can be effectivelyused to design and optimize the fabrication technologies for silvernanoprism-based sensing applications.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Localized surface plasmon resonance
Silver nanoprism
Bulk Refractive Index Sensitivity
Megjelenés:Advanced Optical Materials. - "Accepted by Publisher" (2024), p. 1-11. -
További szerzők:Pritzke, Pia Kluitmann, Jonas Jakobus Köhler, Johann Michael Csáki Andrea Fritzsche, Wolfgang Csarnovics István (1986-) (fizikus) Bonyár Attila
Pályázati támogatás:EFOP-3.6.2-16-2017-00005
EFOP
TKP2021-EGA-02
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

5.

001-es BibID:BIBFORM106838
035-os BibID:(WoS)000794958500002 (Scopus)85127883556
Első szerző:Szántó Géza (fizikus)
Cím:Dimers of gold-silver core-shell nanospheres: The effect of interparticle gap on the refractive index sensitivity and extinction spectrum / Géza Szántó, Attila Bonyár, István Csarnovics
Dátum:2022
ISSN:1569-4410 1569-4429
Megjegyzések:Gold-silver and silver-gold core-shell nanoparticle dimers were studied based on their extinction cross-section spectrum and bulk refractive index sensitivity. The simulations were performed by using the boundary element method (BEM) and the polarization direction of the used plane-wave excitation was parallel with the symmetry axis. The running parameters were the particles' outer and inner radii and their (interparticle gap/full diameter). For different particle sizes and distances, the shape of the spectra and the refractive index sensitivities are presented. In the extinction spectra, the observable peaks originate from either the gold or silver components and the most intense peak position can be distinctly assigned to one of them. A sharp boundary separates these two regions in the plane of the core radius and shell thickness parameters. It was found that by decreasing the interparticle gap, the boundary line between these two regions shifts towards the thinner shells for Ag@Au dimers, while it shifts towards the smaller cores for Au@Ag dimers. Since the sensitivity of peaks corresponding to the Au and Ag components are significantly different, the presented data can help optimize interparticle gaps concerning the core/shell thicknesses to maximize the sensitivity of nanoparticle dimers.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Plasmonics
Nanoparticle dimer
Core-shell bimetallic nanoparticle
Refractive index sensitivity
Localized surface plasmon resonance
Boundary element method
Megjelenés:Photonics and Nanostructures-Fundamentals and Applications. - 50 (2022), p. 101023-. -
További szerzők:Bonyár Attila Csarnovics István (1986-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
BO/348/20
MTA
EFOP-3.6.2-16-2017-00005
EFOP
ÚNKP-21-5-DE-164
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

6.

001-es BibID:BIBFORM092813
035-os BibID:(cikkazonosító)100414
Első szerző:Szántó Géza (fizikus)
Cím:Numerical investigation of the refractive index sensitivity of au/Ag core-shell nanostructures (for sensing applications) / Szántó Géza, Csarnovics István, Bonyár Attila
Dátum:2021
ISSN:2214-1804
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Sensing and Bio-Sensing Research. - 32 (2021), p. 1-17. -
További szerzők:Csarnovics István (1986-) (fizikus) Bonyár Attila
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
EFOP-3.6.2-16-2017-00005
EFOP
BO/348/20
Egyéb
ÚNKP-20-5-DE-107
Egyéb
TKP2020
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1 
Corvina könyvtári katalógus v8.2.27 © 2023 Monguz kft. Minden jog fenntartva.