The effects of retardation on plasmon hybridization within metallic nanostructures

Turner, Mark D.; Hossain, Muntasir; Gu, Min

doi:10.1088/1367-2630/12/8/083062

Cited by 34 publications

(24 citation statements)

References 24 publications

(36 reference statements)

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“…For a single metal shell, the cavity plasmon and the surface plasmon hybridize to form symmetric and anti-symmetric plasmons of which frequencies are significantly different. Similar hybridization has been studied in metal nanotubes 22,23 and coupled metal nanowires 24 . Plasmon hybridization in the nanowires structures can be succinctly described in a manner similar to molecular orbital hybridization, as shown in Figure 1a Inset 18,19,20 .…”

Section: Resultsmentioning

confidence: 64%

Semiconductor-Metal-Semiconductor Core-Multishell Nanowires as Negative-Index Metamaterial in Visible Domain

Ramadurgam

Yang

2014

Sci Rep

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Negative-index metamaterials (NIMs) exhibiting both negative refraction as well as phase reversal, particularly in the visible range, have drawn considerable attention in the past decade due to their potential applications in cloaking, sensing and sub-diffraction-limit imaging. NIM are often realized by arraying sub-wavelength nanostructures (meta-atoms) exhibiting spectrally overlapped magnetic and electric resonances. Most designs so far use scaling down of the resonant elements and employ materials with the right optical constants to obtain NIM in the visible range. However, large losses due to absorption in most metals and semiconductors as well as reduced coupling with light due to scaling pose a challenge to achieving low-loss NIM. Here, we employ plasmon hybridization in semiconductor-metal-semiconductor core-multishell (CMS) nanowires as a unique approach to design low loss, isotropic and polarization dependant NIM in the visible range. Based on numerical simulations, we demonstrate an effective refractive index of 21 and a figure of merit (FOM) of 17 at 650 nm for a representative Si-Ag-Si CMS nanowire NIM and a refractive index of 21, FOM of 25 at 590 nm for a GaP-Ag-GaP CMS nanowire NIM.I n the past decade many breakthroughs have been made towards realizing isotropic, bulk negative-index metamaterial (NIM) in various spectral regimes 1,2 . Specifically, in the visible range, negative refraction has been demonstrated using metallic nanowires embedded in a dielectric matrix 3,4 , fishnet structures 5-7 , metaldielectric stacks/sandwiches 8-10 , planar waveguides 11 and metal-insulator-metal coaxial waveguides 12,13 . Despite the tremendous progress in the design and fabrication of NIM, developing high performance NIM without active loss compensation in the optical domain remains a challenge. This is due to large losses arising from both the NIM designs as well as the materials. The best experimental value for the figure of merit FOM~R e n eff À Á Im n eff À Á reported so far are 3.34 in the visible and 3.5 in near-infrared range obtained from fishnet NIM 7,14 . More recently, theoretical designs have been reported for low loss plasmonic NIM utilizing the geometry dependant Mie excitations in Ag-GaP hybrid rods 15 , Ag-Si core-shell (CS) nanospheres 16 and nanowires 17 . Specifically, in the CS structures the core diameter and the shell thickness are chosen so that the magnetic dipole resonance arising from the dielectric shell and the electric dipole resonance (localized surface plasmon resonance -LSPR) in the metal core spectrally overlap. Around this double resonance, both the electric and magnetic dipole moments in the nanosphere/wire are strongly negative. These sub-wavelength CS structures demonstrating such double resonance feature satisfy the requirements of a NIM meta-atom, therefore CS structures can be engineered into a NIM with simultaneously negative permittivity and permeability. Since the natural magnetic resonance occurring in the dielectric shell is coupled to the LSPR within the same CS...

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Section: Resultsmentioning

confidence: 64%

Semiconductor-Metal-Semiconductor Core-Multishell Nanowires as Negative-Index Metamaterial in Visible Domain

Ramadurgam

Yang

2014

Sci Rep

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“…formulas (9) and (10), E (0) k (Q) and a k (Q) are computed. Finally, using formula (8), ε (2) k is calculated.…”

Section: B Radiation Correctionsmentioning

confidence: 99%

“…As the dimensions of nanoparticle are increased, the quasistatic condition is not strictly valid, and retardation (wave) effects manifest themselves. [7][8][9][10] In this situation, the accuracy of the electrostatic approximation may be compromised and appropriate radiation corrections for the calculation of resonance permittivities are needed. By using the perturbation technique, such radiation corrections have been derived.…”

Section: Introductionmentioning

confidence: 99%

Calculation and measurement of radiation corrections for plasmon resonances in nanoparticles

et al. 2013

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The problem of plasmon resonances in metallic nanoparticles can be formulated as an eigenvalue problem under the condition that the wavelengths of the incident radiation are much larger than the particle dimensions. As the nanoparticle size increases, the quasistatic condition is no longer valid. For this reason, the accuracy of the electrostatic approximation may be compromised and appropriate radiation corrections for the calculation of resonance permittivities and resonance wavelengths are needed. In this paper, we present the radiation corrections in the framework of the eigenvalue method for plasmon mode analysis and demonstrate that the computational results accurately match analytical solutions (for nanospheres) and experimental data (for nanorings and nanocubes). We also demonstrate that the optical spectra of silver nanocube suspensions can be fully assigned to dipole-type resonance modes when radiation corrections are introduced. Finally, our method is used to predict the resonance wavelengths for face-to-face silver nanocube dimers on glass substrates. These results may be useful for the indirect measurements of the gaps in the dimers from extinction cross-section observations.

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“…For other shapes, however, analytical solutions are not available [72] and they must be studied numerically or via plasmon hybridization theory. The advent of plasmon hybridisation theory [75] in 2003 has made it easier to analytically describe plasmon modes in a range of exotic nanostructures, from nanoshells [75], to nanorice [76], to nanotubes with dielectric cores [77]. This is done by describing the interaction of plasmon modes supported by basic structures.…”

Section: Physical Foundations For Surface Plasmonsmentioning

confidence: 99%

“…This is done by describing the interaction of plasmon modes supported by basic structures. For example, plasmon modes of nanoshells could be described as two fundamental dipolar modes [11], with one mode supported on the outside of a larger outer nanosphere and one mode on the surface of a smaller inner dielectric nanosphere or 'void' [77]. Some further important relations, i.e., dispersion equations and resonant frequencies of SPPs and LSPs are listed in Table 1 and discussed in greater detail in Section 3.3.…”

Section: Physical Foundations For Surface Plasmonsmentioning

confidence: 99%

Plasmas meet plasmonics

2012

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Abstract. The term 'plasmon' was first coined in 1956 to describe collective electronic oscillations in solids which were very similar to electronic oscillations/surface waves in a plasma discharge (effectively the same formulae can be used to describe the frequencies of these physical phenomena). Surface waves originating in a plasma were initially considered to be just a tool for basic research, until they were successfully used for the generation of large-area plasmas for nanoscale materials synthesis and processing. To demonstrate the synergies between 'plasmons' and 'plasmas', these large-area plasmas can be used to make plasmonic nanostructures which functionally enhance a range of emerging devices. The incorporation of plasmafabricated metal-based nanostructures into plasmonic devices is the missing link needed to bridge not only surface waves from traditional plasma physics and surface plasmons from optics, but also, more topically, macroscopic gaseous and nanoscale metal plasmas. This article first presents a brief review of surface waves and surface plasmons, then describe how these areas of research may be linked through Plasma Nanoscience showing, by closely looking at the essential physics as well as current and future applications, how everything old, is new, once again.

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The effects of retardation on plasmon hybridization within metallic nanostructures

Cited by 34 publications

References 24 publications

Semiconductor-Metal-Semiconductor Core-Multishell Nanowires as Negative-Index Metamaterial in Visible Domain

Semiconductor-Metal-Semiconductor Core-Multishell Nanowires as Negative-Index Metamaterial in Visible Domain

Calculation and measurement of radiation corrections for plasmon resonances in nanoparticles

Plasmas meet plasmonics

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