A Hybridization Model for the Plasmon Response of Complex Nanostructures

Prodan, Emil; Radloff, Corey; Halas, Naomi J.; Nordlander, Peter

doi:10.1126/science.1089171

Cited by 3,676 publications

(3,328 citation statements)

References 19 publications

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“…1b). Plasmon interactions can be comprehensively described using the analogy with the hybridization of wavefunctions in quantum systems 21,22 . The coupling between plasmonic nanorings lifts the degeneracy of the single-particle mode and gives the antisymmetric (o À ) and symmetric (o þ ) modes with magnetic and electric dipole moments, respectively.…”

Section: Resultsmentioning

confidence: 99%

Symmetry breaking and optical negative index of closed nanorings

et al. 2012

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Metamaterials have extraordinary abilities, such as imaging beyond the diffraction limit and invisibility. Many metamaterials are based on split-ring structures, however, like atomic orbital currents, it has long been believed that closed rings cannot produce negative refractive index. Here we report a low-loss and polarization-independent negative-index metamaterial made solely of closed metallic nanorings. Using symmetry breaking that negatively couples the discrete nanorings, we measured negative phase delay in our composite 'chess metamaterial'. The formation of an ultra-broad Fano-resonance-induced optical negativeindex band, spanning wavelengths from 1.3 to 2.3 mm, is experimentally observed in this structure. This discrete and mono-particle negative-index approach opens exciting avenues towards symmetry-controlled topological nanophotonics with on-demand linear and nonlinear responses.

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Section: Resultsmentioning

confidence: 99%

Symmetry breaking and optical negative index of closed nanorings

et al. 2012

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“…Localized surface plasmon resonance (LSPR), one of the unique properties associated with noble metal nanoparticles, has been studied extensively [1][2][3][4][5][6][7][8][9][10][11][12]. When metal nanoparticles are exposed to light on resonance with their absorption wavelength, a collective oscillation of electrons in the conduction band takes place [13,14].…”

Section: Localized Surface Plasmon Resonance (Lspr) and Mie Theorymentioning

confidence: 99%

“…Both the core width and shell thickness can be tuned through synthesis to produce a range of overall diameters (20-125 nm) and aspect ratios. As a two-interface system HGNs have enhanced LSPR which is the result of strong coupling in the near-field between the plasmon modes of the inner cavity surface and the outer surface [8,9,29,38]. This coupling leads to the hybridization of the two individual plasmon modes where the plasmons interact electrostatically with one another in the same manner as a coupled harmonic oscillator [8,9].…”

Section: Metal Nanostructuresmentioning

confidence: 99%

“…This coupling leads to the hybridization of the two individual plasmon modes where the plasmons interact electrostatically with one another in the same manner as a coupled harmonic oscillator [8,9]. The strength of this coupling is proportional to the aspect ratio of the nanoparticle [8]. As the shell becomes thinner and the aspect ratio increases, the interaction between the cavity and the shell plasmons is amplified producing an enhancement of the EM field associated with the HGNs.…”

Section: Metal Nanostructuresmentioning

confidence: 99%

“…HGN aggregates are also known to exhibit both hybridized plasmon modes, which are the result of surface plasmon interactions with cavity plasmon modes, and collective charge transfer resonances [296][297][298]. However, even when not in direct contact with one another there is an intensification of the dipole charge at the interparticle gap of nanoparticle aggregates in near field proximity [8,[299][300][301]. For example, Xu et al observed that the junction between two nanoparticles 1 nm apart exhibited an EM field enhancement of 10 10 compared to an individual particle [302].…”

Section: Plasmon Coupling In Aggregates For Sersmentioning

confidence: 99%

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Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

2016

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By electrodeposition and galvanic replacement reaction, we developed a facile, time-saving, cost-effective, and environmentally friendly, two-step synthesis route to obtain a controllable cobalt oxide/Au hierarchically nanostructured electrode for glucose sensing. The nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy, meanwhile, the sensing performance was investigated by cyclic voltammetry and amperometric response. The results revealed that this novel electrode exhibited excellent electrocatalytic performance toward glucose oxidation, with a wide double-linear range from 0.2 μM to 20 mM and a low detection limit of 0.1 μM based on a signal-to-noise ratio of 3, which was mainly attributed to the ability of loading a small amount of Au with good electron conductivity on the surface of cobalt oxide nanosheets with large active surface area and synergistic electrocatalytic activity of Au and cobalt oxide toward glucose electrooxidation. This facile, sensitive, and selective glucose sensor is also proven to be suitable for the detection of glucose in human serum.

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Metal‐Enhanced Fluorescence and Its Applications

Sugawa¹

2018

Encyclopedia of Analytical Chemistry

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The fluorescence‐enhancement phenomenon of fluorophores positioned near metal nanostructures (metal‐enhanced fluorescence, MEF) is the result of the interaction between the fluorophores and the localized surface plasmon resonance (LSPR) of the nanostructures. This enhancement phenomenon can contribute to the development of novel sensors based on unprecedented mechanisms, as well as improving the sensitivity of existing biosensors and imaging techniques. In this article, the two main mechanisms for MEF are briefly explained: the light‐harvesting nanoantenna effect and the increase in the radiative decay rate. This is followed by an introduction to metal nanostructures and nanoparticles (substrate‐based platforms and solution‐dispersed colloidal nanoparticle‐based platforms), which can act as MEF platforms. In addition, the efficient suppression of fluorescence blinking and photobleaching induced by the interaction with LSPR are described, as these are secondary advantages for fluorescence‐based sensors. Subsequently, the generation of hot spots, which could be one of the key phenomena for significant fluorescence enhancement, is outlined. An examination of usability of MEF platforms consisting of Al and Cu (metal species other than Au and Ag) to further improve their applicability is also discussed. Finally, some recent applications such as the development of imaging techniques, nanoprobes, and biosensors utilizing the MEF phenomenon are briefly introduced.

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A Hybridization Model for the Plasmon Response of Complex Nanostructures

Cited by 3,676 publications

References 19 publications

Symmetry breaking and optical negative index of closed nanorings

Symmetry breaking and optical negative index of closed nanorings

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

Metal‐Enhanced Fluorescence and Its Applications

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