Three-Dimensional Plasmonic Nanoclusters

Urban, Alexander S.; Shen, Xiaoshuang; Wang, Yumin; Large, Nicolas; Wang, Hong; Knight, Mark W.; Nordlander, Peter; Chen, Hongyu; Halas, Naomi J.

doi:10.1021/nl402231z

Cited by 173 publications

(198 citation statements)

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“…The subwavelength scale of these clusters means that their optical response is highly dependent on their specific geometry (22). Consequently, control over their structure enables control over their optical properties, with implications for cloaking (23), chemical sensing (24), imaging (25), nonlinear optics (26), and the creation of so-called metafluids (27)(28)(29), among a host of other applications (30). Recent work on plasmonic nanoclusters of faceted particles including nanocubes (31), nanoprisms (32), and nanooctahedra (33) introduces an additional means by which to tailor optical response.…”

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confidence: 99%

Clusters of polyhedra in spherical confinement

Teich

Anders

Klotsa

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Dense particle packing in a confining volume remains a rich, largely unexplored problem, despite applications in blood clotting, plasmonics, industrial packaging and transport, colloidal molecule design, and information storage. Here, we report densest found clusters of the Platonic solids in spherical confinement, for up to N = 60 constituent polyhedral particles. We examine the interplay between anisotropic particle shape and isotropic 3D confinement. Densest clusters exhibit a wide variety of symmetry point groups and form in up to three layers at higher N. For many N values, icosahedra and dodecahedra form clusters that resemble sphere clusters. These common structures are layers of optimal spherical codes in most cases, a surprising fact given the significant faceting of the icosahedron and dodecahedron. We also investigate cluster density as a function of N for each particle shape. We find that, in contrast to what happens in bulk, polyhedra often pack less densely than spheres. We also find especially dense clusters at so-called magic numbers of constituent particles. Our results showcase the structural diversity and experimental utility of families of solutions to the packing in confinement problem.clusters | confinement | packing | colloids | nanoparticles P henomena as diverse as crowding in the cell (1, 2), DNA packaging in cell nuclei and virus capsids (3, 4), the growth of cellular aggregates (5), biological pattern formation (6), blood clotting (7), efficient manufacturing and transport, the planning and design of cellular networks (8), and efficient food and pharmaceutical packaging and transport (9) are related to the optimization problem of packing objects of a specified shape as densely as possible within a confining geometry, or packing in confinement. Packing in confinement is also a laboratory technique used to produce particle aggregates with consistent structure. These aggregates may serve as building blocks (or "colloidal molecules") in hierarchical structures (10, 11), information storage units (12), or drug delivery capsules (13). Experiments concerning cluster formation via spherical droplet confinement (13-20) are of special interest here. Droplets are typically either oil-in-water or water-inoil emulsions, and particle aggregation is induced via the evaporation of the droplet solvent. Clusters may be hollow [in which case they are termed "colloidosomes" (13)] or filled, depending on the formation protocol, and may contain a few (15) to a few billion (14) particles. Clusters of several metallic nanoparticles are especially intriguing given their ability to support surface plasmon modes over a range of frequencies (21). The subwavelength scale of these clusters means that their optical response is highly dependent on their specific geometry (22). Consequently, control over their structure enables control over their optical properties, with implications for cloaking (23), chemical sensing (24), imaging (25), nonlinear optics (26), and the creation of so-called metafluids (27)(28)(29), a...

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mentioning

confidence: 99%

Clusters of polyhedra in spherical confinement

Teich

Anders

Klotsa

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…In the self-assembly processes, 1D-chains (or small oligomers), 2D-arrays or 3D-compact nanoparticle clusters [12] are most commonly obtained. These nanostructures enable tuning of the optical response [13][14][15] for new type of applications, such as colorimetric assays [16] or based on SERS enhancement [17]. The clustering of the particles and the evolution of the different assemblies can be followed by UV-Vis spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…The clustering of the particles and the evolution of the different assemblies can be followed by UV-Vis spectroscopy. There are several literature examples, where assignment of the evolved nanoparticle cluster structure has been carried out solely based on spectroscopic characterization (or by naked eye due to the color change) and the identification of dimers, trimers [13], chains [18,19] or larger clusters [15] based on the extinction spectra has been claimed. Two-dimensional nanoparticle arrays have been also reported with potentially useful optical properties due to the collective plasmonic oscillations [20,21].…”

Section: Introductionmentioning

confidence: 99%

Optical Simulations of Self-assembly Relevant Gold Aggregates: A Comparative Study

Zámbó

Deák

2016

Period. Polytech. Chem. Eng.

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In this study, visible light extinction spectra of different gold nanoparticle assemblies were simulated using boundary element method (BEM) IntroductionGold nanoparticles feature strong extinction in the visible wavelength range due to the evolution of localized surface plasmon resonance (LSPR) upon interaction with visible light, which can be exploited in the field of sensing [1-3], catalysis [4,5], and biomedical applications [6,7]. Since the LSPR of gold nanoparticles manifests itself in a pronounced extinction peak in the visible, it can be conveniently investigated using ensemble spectroscopy techniques. The optical response of the particles on the other hand is tunable: the peak position of LSPR is sensitive to the size [8] and shape [9, 10] as well. Organizing the individual gold building blocks into self-assembled structures can open route towards new properties and applications [11]. In the self-assembly processes, 1D-chains (or small oligomers), 2D-arrays or 3D-compact nanoparticle clusters [12] are most commonly obtained. These nanostructures enable tuning of the optical response [13][14][15] for new type of applications, such as colorimetric assays [16] or based on SERS enhancement [17]. The clustering of the particles and the evolution of the different assemblies can be followed by UV-Vis spectroscopy. There are several literature examples, where assignment of the evolved nanoparticle cluster structure has been carried out solely based on spectroscopic characterization (or by naked eye due to the color change) and the identification of dimers, trimers [13], chains [18,19] or larger clusters [15] based on the extinction spectra has been claimed. Two-dimensional nanoparticle arrays have been also reported with potentially useful optical properties due to the collective plasmonic oscillations [20,21].Besides the structure or size [22] of the particle cluster, the interparticle distance between the building blocks [21,23] has also a profound effect on the evolving coupled mode. It has to be emphasized that in a real experiment -independently of the resulting structure -the clustering process usually generates a distribution of structures. Consequently, a multitude of coupled modes can exist simultaneously that can be excited by the external source. However, the overall optical response of the system is determined by the optically dominant centers [19], which is responsible e.g. for the presence of a 'distinct' coupled mode in the extinction spectrum during the aggregation of gold

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“…Fluorescence from emitters and Raman scattering of a molecule in the vicinity of plasmonic nanoantennas can be substantially enhanced, enabling the detection of species even down to single molecule level. Numerous types of nanoantenna configurations have demonstrated their ability to confine light at nanoscale and strongly enhance local fields, such as bowties [11,12], nanorods [13], nanorings [14,15] and clusters of nanoparticles [16]. However, most of these antennas are limited by the narrow band spectral response because of their dipolar nature, with a typical bandwidth at the order of 100 nm.…”

Section: Introductionmentioning

confidence: 99%

Broadband Nanoantennas for Plasmon Enhanced Fluorescence and Raman Spectroscopies

Yong¹,

Zhang²,

Dong³

et al. 2015

PIER

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Abstract-We propose a novel design of broadband plasmonic nanoantenna that is suitable for fluorescence and Raman enhancement. The structure consists of a gold nanoring and bowties at the center. We numerically investigate the near field and far field performance by employing the finitedifference time-domain method. High Purcell enhancement and large SERS are demonstrated in a record wide spectral bandwidth of 700 nm based on a single emitter-antenna configuration. Moreover, unlike a traditional antenna design, the proposed nanoantenna has low heat generation and high field enhancement at the gap simultaneously when operating off resonance.

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Three-Dimensional Plasmonic Nanoclusters

Cited by 173 publications

References 44 publications

Clusters of polyhedra in spherical confinement

Clusters of polyhedra in spherical confinement

Optical Simulations of Self-assembly Relevant Gold Aggregates: A Comparative Study

Broadband Nanoantennas for Plasmon Enhanced Fluorescence and Raman Spectroscopies

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