Localized Surface Plasmons of Supershape Nanoparticle Dimers

Babaei, Ferydon; Javidnasab, M.; Rezaei, A.

doi:10.1007/s11468-018-0803-6

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The UV/Visible spectra reveal a reduction surface plasmon resonance intensity and peak broadening, as well as an increasing red-shift in samples synthesized at increasing temperatures, as shown in Figure 5 whereas spherical nanoparticles have a single peak in the 520-575 nm range. The 535 nm peak of star-like nanoparticles is similar to the transverse oscillation mode observed on other gold nanoparticles, such as gold nanorods and nanoparticle dimer assemblies [30,31] and the second peak at 620 nm is the result of the branch features present on the samples. Similar trend was observed by Bakr et al [32] who reported that gold nanoparticles with multiple branches resembling the shape of sea urchins demonstrated a shift in the SPR from 585 to 622 nm together with peak broadening due to particle branching.…”

Section: Surface Plasmon Resonancessupporting

confidence: 66%

Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

Darienzo¹,

Chen²,

Sullivan³

et al. 2018

Preprint

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<p>Quasi-fractal gold nanoparticles can be synthesized via a modified and temperature controlled procedure initially used for the synthesis of star-like gold nanoparticles. The surface features of nanoparticles leads to improved enhancement of Raman scattering intensity of analyte molecules due to the increased number of sharp surface features possessing numerous localized surface plasmon resonances (LSPR). The LSPR is affected by the size and shape of surface features as well as inter-nanoparticle interactions, as these affect the oscillation modes of electrons on the nanoparticle surfaces. The effect of the particle morphologies on the LSPR and further on the surface-enhancing capabilities of these nanoparticles is explored by comparing different nanoparticle morphologies and concentrations. We show that in a fixed nanoparticle concentration regime, Quasi-fractal gold nanoparticles provide the highest level of surface enhancement, whereas spherical nanoparticles provide the largest enhancement in a fixed gold concentration regime. The presence of highly branched features enables these nanoparticles to couple with a laser wavelength despite having no strong absorption band and hence no single surface plasmon resonance. This cumulative LSPR may allow these nanoparticle to be used in a variety of applications where laser wavelength flexibility is beneficial, such as in medical imaging applications where fluorescence at short laser wavelengths may be coupled with non-fluorescing long laser wavelengths for molecular sensing. </p>

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Section: Surface Plasmon Resonancessupporting

confidence: 66%

Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

Darienzo¹,

Chen²,

Sullivan³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The plasmonic effect of a nanoshell dimer, with its core filled with different gain materials, was reported [15]. The plasmonic properties of gold supershape nanoparticle dimers were studied using finite difference time domain simulations, and the resonance wavelength was obtained from extinction spectra for all plasmonic bands [16]. Besides, the optical absorption spectrum of a periodic array of silver nanoparticle dimer on a thin silver film was investigated using multiple scattering formalism [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the fano lineshapes in plasmonic asymmetric silver nanosphere dimer

Dong²,

Xiong³

et al. 2022

Opt Quant Electron

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The plasmonic properties of an asymmetric dimer, comprising of two silver nanospheres with different radii, are studied by the finite difference time domain method. The extinction efficiencies of the plasmonic dimer are numerically calculated in the visible and near-infrared regime, i.e., from 950THz to 150THz. Two distinguishable Fano resonances are observed when the separation between the nanospheres is narrowed within a certain value, e.g., less than 10nm. The extinction spectrum that presents two Fano resonances, associated with two electromagnetic modes, is well fitted using a model consisting of two Fano lineshape functions. The resonance frequencies, the spectral widths, and the characteristic q values are obtained via the best fit parameters, and their trends are revealed with varying the radii of the nanospheres. The fitting scheme proposed in this work may be useful in the study of other plasmonic nanostructures with multiple Fano resonances.

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“…However, a star shape planar particle with multibranches tends to blueshift with an increasing number of pins with fixed total surface area. [22][23][24] As approaching a circular disk, it exhibits the bluest resonant mode. This blueshift effect was actually originated from their shrinking branch length in order to keep the total surface area conserved.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic resonant modes in highly symmetric multi-branches sea-urchin like nanostructures

Chen¹,

Lin²,

Su³

et al. 2021

Jpn. J. Appl. Phys.

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The electrostatic charge distribution model and the finite-difference time-domain method were used to provide a physically intuitive interpretation of how the shape and the number of branches affect the localized surface plasmon resonances of 3D sea-urchin like nanoparticles. We consider both planner and spherical structures with pins of cylindrical, triangular and hexagonal shape. Better alignment between surface charges of opposite sign leads to higher resonant energy states. More pin numbers provide more surface distribution area to spread dipole charges which leads to worse charges alignment and redshift of dipole mode. However, as the pin number increases, the quadrupole surface charge was pushed toward the pin tip due to Coulomb repulsion. Better charge alignment caused the quadrupole blueshift. Other effects such as convex and concave shape and dielectric materials are also discussed. Our finding may provide a designing rule to synthesize multi-branch nanoparticles for bio-chemical sensing applications.

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Localized Surface Plasmons of Supershape Nanoparticle Dimers

Cited by 6 publications

References 19 publications

Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

Investigation of the fano lineshapes in plasmonic asymmetric silver nanosphere dimer

Plasmonic resonant modes in highly symmetric multi-branches sea-urchin like nanostructures

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