Optical Properties of Gold Nanorings

Aizpurua, Javier; Hanarp, Per; Sutherland, Duncan S.; Käll, Mikael; Bryant, Garnett W.; Abajo, F. Javier García de

doi:10.1103/physrevlett.90.057401

Cited by 1,037 publications

(947 citation statements)

References 16 publications

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“…Discrete metallic nanorings have been studied in rather simple configurations as plasmonic resonators, but have not been able to produce negative permeability or negative indices 2,3,19,20 . We instead consider two layers of coupled rings as schematically shown in Fig.…”

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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“…In addition, ab-initio results of the dielectric function are ready to be used as valuable input for subsequent semiclassical calculations of the optical response [9,39]. The latter can take into account size, shape and chemical environment effects.…”

Section: Discussionmentioning

confidence: 99%

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Silkin

Muiño

Chernov

et al. 2012

J. Phys.: Condens. Matter

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Abstract. First principles calculations are performed to obtain the dielectric function and loss spectra of bulk PdH x . Hydrogen concentrations between x = 0 and x = 1 are considered. The calculated spectra are dominated by a broad peak that redshifts in energy with x. The obtained bulk dielectric function is employed to compute the loss spectra of PdH x spherical nanoparticles as a function of x. The dominant plasmon peak in the spherical nanoparticle is lowered in energy with respect to the bulk case. However, the dependence of the resonance energy on the hydrogen concentration is roughly similar to that in bulk.

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“…Beyond simple spheres and rods, many other shapes have been fabricated, as for example nanoshells, 8 nanorings 9 and cylinders with crescent shaped cross sections. 10 Furthermore, coupling of many antennas into dimer, trimers, etc.., can give rise to a novel collective response, as in metamaterials based on arrays of parallel nanorods.…”

Section: Introductionmentioning

confidence: 99%

Percolating plasmonic networks for light emission control

et al. 2015

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Optical nanoantennas have revolutionised the way we manipulate single photons emitted by individual light sources in a nanostructured photonic environment. Complex plasmonic architectures allow for multiscale light control by shortening or stretching the light wavelength for a fixed operating frequency, meeting the size of the emitter and that of propagating modes. Here, we study self-assembled semi-continuous gold films and lithographic gold networks characterised by large local density of optical state (LDOS) fluctuations around the electrical percolation threshold, a regime where the surface is characterised by large metal clusters with fractal topology. We study the formation of plasmonic networks and their effect on light emission from embedded fluorescent probes in these systems. Through fluorescence dynamics experiments we discuss the role of global long-range interactions linked to the degree of percolation and to the network fractality, as well as the local near-field contributions coming from the local electro-magnetic fields and the topology. Our experiments indicate that local properties dominate the fluorescence modification.

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Optical Properties of Gold Nanorings

Cited by 1,037 publications

References 16 publications

Symmetry breaking and optical negative index of closed nanorings

Symmetry breaking and optical negative index of closed nanorings

Tuning the plasmon energy of palladium–hydrogen systems by varying the hydrogen concentration

Percolating plasmonic networks for light emission control

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