Size dependence of refractive index of gold nanoparticles

Scaffardi, Lucia; Tocho, Jorge O.

doi:10.1088/0957-4484/17/5/024

Cited by 202 publications

(187 citation statements)

References 17 publications

Supporting

Mentioning

174

Contrasting

Unclassified

Order By: Relevance

“…Line broadening has been seen experimentally in the extinction of small particles [37][38][39][40][41] and EELS measurements on plasmons in thin nanowires and bow-tie antennas have also revealed plasmon losses exceeding the expectations based on bulk-damping parameters 42,43 . In the literature such line broadening has often been phenomenologically accounted for by a size-dependent damping rate [37][38][39][40][41] , but without placing it in the context of non-local semiclassical equations of motion. The phenomenology introduced by Kreibig 37,38 describes the linewidth broadening by introducing a size-dependent correction to the damping rate: g-g þ Au F /R.…”

Section: Resultsmentioning

confidence: 96%

A generalized non-local optical response theory for plasmonic nanostructures

et al. 2014

View full text Add to dashboard Cite

Metallic nanostructures exhibit a multitude of optical resonances associated with localized surface plasmon excitations. Recent observations of plasmonic phenomena at the sub-nanometre to atomic scale have stimulated the development of various sophisticated theoretical approaches for their description. Here instead we present a comparatively simple semiclassical generalized non-local optical response theory that unifies quantum pressure convection effects and induced charge diffusion kinetics, with a concomitant complex-valued generalized non-local optical response parameter. Our theory explains surprisingly well both the frequency shifts and size-dependent damping in individual metallic nanoparticles as well as the observed broadening of the crossover regime from bondingdipole plasmons to charge-transfer plasmons in metal nanoparticle dimers, thus unravelling a classical broadening mechanism that even dominates the widely anticipated short circuiting by quantum tunnelling. We anticipate that our theory can be successfully applied in plasmonics to a wide class of conducting media, including doped semiconductors and low-dimensional materials such as graphene.

show abstract

Section: Resultsmentioning

confidence: 96%

A generalized non-local optical response theory for plasmonic nanostructures

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Even below 10 nm we do not observe a major difference in EF for 473 and 532 nm excitation wavelengths. The explanation for the similarities in EF for both wavelengths is that we are probing within the interband transition region of Au [1,25,[35][36]. Probing with a larger excitation wavelength would minimize the energy losses which are at a minimum around 650 nm.…”

Section: Papermentioning

confidence: 97%

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Damm

Fedele

Murphy

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

Here, we demonstrate that quasi self-standing Au nanorod arrays prepared with plasma polymerisation deposited SiO2 dielectric spacers support surface enhanced fluorescence (SEF) while maintaining high signal reproducibility. We show that it is possible to find a balance between enhanced radiative and non-radiative decay rates at which the fluorescent intensity is maximized. The SEF signal optimised with a 30 nm spacer layer thickness showed a 3.5-fold enhancement with a signal variance of <15% thereby keeping the integrity of the nanorod array. We also demonstrate the decreased importance of obtaining resonance conditions when localized surface plasmon resonance is positioned within the spectral region of Au interband transitions. Procedures for further increasing the SEF enhancement factor are also discussed.

show abstract

“…Having determined R S independently from the SAXS data, we are now in a position to evaluate A (see Figure 4). Its average value is about A = 0.35, to be compared with the literature values of 0.6 − 2 for gold spheres [24][25][26] . …”

Section: Saxsmentioning

confidence: 61%

Morphology of gold nanoparticles determined by full-curve fitting of the light absorption spectrum. Comparison with X-ray scattering and electron microscopy data

2014

View full text Add to dashboard Cite

UV-Vis absorption spectroscopy is frequently used to characterize the size and shape of gold nanoparticles. We present a fullspectrum model that yields reliable results for the commonly encountered case of mixtures of spheres and rods in varying proportions. We determine the volume fractions of the two populations, the aspect ratio distribution of the nanorods (average value and variance) and the interface damping parameter. We validate the model by checking the fit results against small-angle X-ray scattering and transmission electron microscopy data and show that correctly accounting for the polydispersity in aspect ratio is essential for a quantitative description of the longitudinal plasmon peak.

show abstract

Size dependence of refractive index of gold nanoparticles

Abstract: In s ti t u te o f Ph y s ic s Pu b l is h in g Na n o t e c h n o l o g y L u cía B S c a ffa r d i1,2 and Jorge O T och o1,3

Cited by 202 publications

References 17 publications

A generalized non-local optical response theory for plasmonic nanostructures

A generalized non-local optical response theory for plasmonic nanostructures

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Morphology of gold nanoparticles determined by full-curve fitting of the light absorption spectrum. Comparison with X-ray scattering and electron microscopy data

Contact Info

Product

Resources

About