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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
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2.

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
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DOI
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