Guided plasmonic modes in nanorod assemblies: strong electromagnetic coupling regime

Wurtz, Gregory A.; Dickson, Wayne; O’Connor, Daniel; Atkinson, R.; Hendren, William; Evans, Paul; Pollard, Robert; Zayats, Anatoly V.

doi:10.1364/oe.16.007460

Cited by 114 publications

(83 citation statements)

References 34 publications

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“…Fabricated gold nanorod arrays show similar trends as the assembled colloidal rods. [98][99][100] The sizeable amount of data and theoretical modeling, describing the coupling between various shaped nanostructures, has made possible numerous comparisons. In their study of gold nanoparticles, Su et al [95] demonstrated that the plasmon shift, due to field coupling, increased exponentially as the interparticle dimension decreased.…”

Section: Near-field Effect and Couplingmentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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Noble metal nanoparticles are capable of confining resonant photons in such a manner as to induce coherent surface plasmon oscillation of their conduction band electrons, a phenomenon leading to two important properties. Firstly, the confinement of the photon to the nanoparticle's dimensions leads to a large increase in its electromagnetic field and consequently great enhancement of all the nanoparticle's radiative properties, such as absorption and scattering. Moreover, by confining the photon's wavelength to the nanoparticle's small dimensions, there exists enhanced imaging resolving powers, which extend well below the diffraction limit, a property of considerable importance in potential device applications. Secondly, the strongly absorbed light by the nanoparticles is followed by a rapid dephasing of the coherent electron motion in tandem with an equally rapid energy transfer to the lattice, a process integral to the technologically relevant photothermal properties of plasmonic nanoparticles. Of all the possible nanoparticle shapes, gold nanorods are especially intriguing as they offer strong plasmonic fields while exhibiting excellent tunability and biocompatibility. We begin this review of gold nanorods by summarizing their radiative and nonradiative properties. Their various synthetic methods are then outlined with an emphasis on the seed-mediated chemical growth. In particular, we describe nanorod spontaneous self-assembly, chemically driven assembly, and polymer-based alignment. The final section details current studies aimed at applications in the biological and biomedical fields.

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Section: Near-field Effect and Couplingmentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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“…In the optical frequency range wire metamaterial may be realized as an array of gold nanowires in alumina [30,3]. Purcell factor calculated for this structure is presented in Fig.…”

Section: Application To Particular Structuresmentioning

confidence: 99%

Purcell effect in wire metamaterials

Poddubny

Belov²,

Kivshar

2013

Phys. Rev. B

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Abstract. We study theoretically the enhancement of spontaneous emission in wire metamaterials. We analyze the dependence of the Purcell factor dependence on wire dielectric constant for both electric and magnetic dipole sources, and find an optimal value of the dielectric constant for maximizing the Purcell factor for the electric dipole. We obtain analytical expressions for the Purcell factor and also provide estimates for the Purcell factor in realistic structures operating in both microwave and optical spectral range.Purcell effect in wire metamaterials 2

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“…In particular, the so-called hyperbolic metamaterials described by an uniaxial medium where the main components of dielectric and magnetic tensor have different signs, have attracted significant attention [8][9][10]. Realizations of the regime of the hyperbolic medium with negative components of the dielectric tensor have been reported for magnetized plasma [11], graphite [12], for metamaterials based on nanorod assemblies [13][14][15] and for layered metal-dielectric structures [2,16,17]. In this regime, light wavevectors at a given frequency fill a surface of a hyperbolic shape, so that the area of hyperbolic isofrequency surface, giving the photonic density of states, is infinite.…”

Section: Introductionmentioning

confidence: 99%

Microscopic model of Purcell enhancement in hyperbolic metamaterials

et al. 2012

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We study theoretically a dramatic enhancement of spontaneous emission in metamaterials with the hyperbolic dispersion modeled as a cubic lattice of anisotropic resonant dipoles. We analyze the dependence of the Purcell factor on the source position in the lattice unit cell and demonstrate that the optimal emitter position to achieve large Purcell factors and Lamb shifts are in the local field maxima. We show that the calculated Green function has a characteristic cross-like shape, spatially modulated due to structure discreteness. Our basic microscopic theory provides fundamental insights into the rapidly developing field of hyperbolic metamaterials.

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Guided plasmonic modes in nanorod assemblies: strong electromagnetic coupling regime

Cited by 114 publications

References 34 publications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

Purcell effect in wire metamaterials

Microscopic model of Purcell enhancement in hyperbolic metamaterials

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