Localized Surface Plasmon Decay Pathways in Disordered Two-Dimensional Nanoparticle Arrays

Antosiewicz, Tomasz J.; Tarkowski, Tomasz

doi:10.1021/acsphotonics.5b00420

Cited by 27 publications

(22 citation statements)

References 46 publications

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“…Figure 2 shows the UV-vis spectra obtained from films deposited on glass. We can see a strong scattering contribution (reflectance) from AgNP clusters at ~500 nm, consequence of the strong local field produced by NP interaction, which is also expected to balance in part the lower radiative efficiency of isolated NPs nm 46 . The redshift and broadening of the main scattering band is ascribed to the random aggregation of the polydispersed nanoparticles forming the clusters 43 47 and to inter-cluster coupling influence 42 .…”

Section: Resultsmentioning

confidence: 87%

Nanometal Skin of Plasmonic Heterostructures for Highly Efficient Near-Field Scattering Probes

Zito

Rusciano

Vecchione

et al. 2016

Sci Rep

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In this work, atomic force microscopy probes are functionalized by virtue of self-assembling monolayers of block copolymer (BCP) micelles loaded either with clusters of silver nanoparticles or bimetallic heterostructures consisting of mixed species of silver and gold nanoparticles. The resulting self-organized patterns allow coating the tips with a sort of nanometal skin made of geometrically confined nanoislands. This approach favors the reproducible engineering and tuning of the plasmonic properties of the resulting structured tip by varying the nanometal loading of the micelles. The newly conceived tips are applied for experiments of tip-enhanced Raman scattering (TERS) spectroscopy and scattering-type scanning near-field optical microscopy (s-SNOM). TERS and s-SNOM probe characterizations on several standard Raman analytes and patterned nanostructures demonstrate excellent enhancement factor with the possibility of fast scanning and spatial resolution <12 nm. In fact, each metal nanoisland consists of a multiscale heterostructure that favors large scattering and near-field amplification. Then, we verify the tips to allow challenging nongap-TER spectroscopy on thick biosamples. Our approach introduces a synergistic chemical functionalization of the tips for versatile inclusion and delivery of plasmonic nanoparticles at the tip apex, which may promote the tuning of the plasmonic properties, a large enhancement, and the possibility of adding new degrees of freedom for tip functionalization.

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Section: Resultsmentioning

confidence: 87%

Nanometal Skin of Plasmonic Heterostructures for Highly Efficient Near-Field Scattering Probes

Zito

Rusciano

Vecchione

et al. 2016

Sci Rep

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show abstract

“…3b from the FDTD simulations with explicit nanoparticles. This result shows that while the amount of matter is the same, the size distribution cannot be neglected, and that, as a whole, a dense layer of small nanoparticles interacts with light most efficiently [46]. This evolution is also captured by the gradient model, although the degree of change is smaller than in FDTD with explicit nanospheres.…”

Section: Resultsmentioning

confidence: 99%

Effective Optical Properties of Inhomogeneously Distributed Nanoobjects in Strong Field Gradients of Nanoplasmonic Sensors

et al. 2018

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Accurate and efficient modeling of discontinuous, randomly distributed entities is a computationally challenging task, especially in the presence of large and inhomogeneous electric near-fields of plasmons. Simultaneously, the anisotropy of sensed entities and their overlap with inhomogeneous fields means that typical effective medium approaches may fail at describing their optical properties. Here, we extend the Maxwell Garnett mixing formula to overcome this limitation by introducing a gradient within the effective medium description of inhomogeneous nanoparticle layers. The effective medium layer is divided into slices with a varying volume fraction of the inclusions and, consequently, a spatially varying effective permittivity. This preserves the interplay between an anisotropic particle distribution and an inhomogeneous electric field and enables more accurate predictions than with a single effective layer. We demonstrate the usefulness of the gradient effective medium in FDTD modeling of indirect plasmonic sensing of nanoparticle sintering. First of all, it yields accurate results significantly faster than with explicitly modeled nanoparticles. Moreover, by employing the gradient effective medium approach, we prove that the detected signal is proportional to not only the nanoparticle size but also its size dispersion and potentially shape. This implies that the simple volume fraction parameter is insufficient to properly homogenize these types of nanoparticle layers and that in order to quantify optically the state of the layer more than one independent measurement should be carried out. These findings extend beyond nanoparticle sintering and could be useful in analysis of average signals in both plasmonic and dielectric systems to unveil dynamic changes in exosomes or polymer brushes, phase changes of nanoparticles, or quantifying light absorption in plasmon assisted catalysis.

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“…By using T‐matrix calculations in amorphous arrays, Antosiewicz et al. presented how the scattering‐to‐absorption ratio of the localized plasmon decay depended on particle density and disorder . Along with the inherent single‐particle ratio, the scattering‐to‐absorption ratio also showed itself to be dependent on the interparticle distance in the disordered array.…”

Section: Amorphous Materials With Lsprmentioning

confidence: 99%

Amorphous Materials for Enhanced Localized Surface Plasmon Resonances

Zhu

2018

Chemistry An Asian Journal

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The discovery of localized surface plasmon resonance (LSPR) in semiconductor nanocrystals has initiated a new field in plasmonics. Plasmonic nanocrystals in particular have seen rapid development in recent years because they are a class of materials with unique photoelectronic properties. At present, a growing number of amorphous plasmonic materials has been steadily capturing scientific interest, though only a few of these are well characterized. Here we focus on recent developments in state-of-the art experiments and explore the vast library of plasmonic properties in amorphous materials, including their application fields and optical spectral range. Taken together, the growing regime of amorphous material plasmonics offers enticing avenues for harnessing light-matter interactions from the visible to the terahertz region, with new potential for optical manipulation beyond what can be accomplished using traditional crystal materials.

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Localized Surface Plasmon Decay Pathways in Disordered Two-Dimensional Nanoparticle Arrays

Cited by 27 publications

References 46 publications

Nanometal Skin of Plasmonic Heterostructures for Highly Efficient Near-Field Scattering Probes

Nanometal Skin of Plasmonic Heterostructures for Highly Efficient Near-Field Scattering Probes

Effective Optical Properties of Inhomogeneously Distributed Nanoobjects in Strong Field Gradients of Nanoplasmonic Sensors

Amorphous Materials for Enhanced Localized Surface Plasmon Resonances

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