Avoiding crossing of dielectric resonances in three-component composites

Gu, Ying; Gong, Qihuang

doi:10.1103/physrevb.67.014209

Cited by 16 publications

(26 citation statements)

References 19 publications

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“…Also, for graded component, (r) is a continuous function, which will cover the full region, i.e., −∞ (r) ∞. Therefore, the eigenvalues s n , which depend on the continuously graded microstructure (r), do not lie within the interval [0, 1] but extend to −∞ s n ∞ as first pointed by Gu and Gong [33] for three-component composites case. However, eigenvalues s n still lie in [0, 1] for 0 (r) 1.…”

Section: Spectral Representation For Understanding the Effective Dielmentioning

confidence: 99%

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Enhanced nonlinear optical responses of materials: Composite effects

2006

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We review recent theoretical progress in understanding physical processes of composite effects on enhanced third-order nonlinear optical responses of various kinds of the recently-proposed nonlinear optical materials, namely, colloidal nanocrystals with inhomogeneous metallodielectric particles or a graded-index host, metallic films with inhomogeneous microstructures adjusted by ion doping or temperature gradient, composites with compositional gradation or graded particles, and magneto-controlled ferrofluidbased nonlinear optical materials.

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Section: Spectral Representation For Understanding the Effective Dielmentioning

confidence: 99%

“…We would also like to mention that the extension of the Bergman-Milton spectral representation to the threecomponent composite can be made by taking into account various approaches [31][32][33].…”

Section: Original Derivationmentioning

confidence: 99%

Enhanced nonlinear optical responses of materials: Composite effects

2006

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“…Previously, multiple resonance of surface plasmon has been reported in the nanocrescent and C-type structures [22,23] It is found that near η = 2.8 the avoiding of crossing and mode transfer phenomena between branch 41 and branch 42 appear. We noted the same phenomena of dielectric resonance occurring in the quasistatic limit [20,24]. When η is very large, the resonant dielectric permittivities of both nanostrips go beyond the optical frequency region and are of limited practical use in optics.…”

Section: (C)mentioning

confidence: 88%

“…where C = C 1 ∪ C 2 denotes the cluster subspace, and η = ( 2 − 0 )/( 1 − 0 ) is called the difference permittivity ratio [20]. In the subspace C 1 or C 2 , 1 (r, ω) or 2 (r, ω) is simplified as 1 (ω) or 2 (ω).…”

Section: Green Matrix Methods For Two-component Subwavelength Structuresmentioning

confidence: 99%

Interplay of plasmon resonances in binary nanostructures

Wang

et al. 2009

Appl. Phys. B

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By introducing the difference permittivity ratio η = ( 2 − 0 )/( 1 − 0 ), the Green matrix method for computing surface plasmon resonances is extended to binary nanostructures. Based on the near field coupling, the interplay of plasmon resonances in two closely packed nanostrips is investigated. At a fixed wavelength, with varying η the resonances exhibit different regions: the dielectric effect region, resonance chaos region, collective resonance region, resonance flat region, and new branches region. Simultaneously, avoiding crossing and mode transfer phenomena between the resonance branches are observed. These findings will be helpful to design hybrid plasmonic subwavelength structures.PACS 73.20.Mf · 78.67.-n · 78.68.+m

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“…It is found that near η = 2.8 the avoiding crossing and mode transfer phenomena between branch 41 and branch 42 appear. We note as well that within the quasistatic limit the same phenomenon of dielectric resonance occurs [51,52].…”

Section: Plasmon Control Through Binary Metallic Nanostrcuturesmentioning

confidence: 98%

Solving surface plasmon resonances and near field in metallic nanostructures: Green’s matrix method and its applications

Martin

et al. 2010

Chin. Sci. Bull.

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With the development of nanotechnology, many new optical phenomena in nanoscale have been demonstrated. Through the coupling of optical waves and collective oscillations of free electrons in metallic nanostructures, surface plasmon polaritons can be excited accompanying a strong near field enhancement that decays in a subwavelength scale, which have potential applications in the surface-enhanced Raman scattering, biosensor, optical communication, solar cells, and nonlinear optical frequency mixing. In the present article, we review the Green's matrix method for solving the surface plasmon resonances and near field in arbitrarily shaped nanostructures and in binary metallic nanostructures. Using this method, we design the plasmonic nanostructures whose resonances are tunable from the visible to near-infrared, study the interplay of plasmon resonances, and propose a new way to control plasmonic resonances in binary metallic nanostructures. Near field concerns the evanescent wave bound to a nanostructured material surface that decays exponentially within a subwavelength [1,2]. At the metallic-dielectric interface or in the isolated metallic nanostructure, due to the existence of collective oscillations of free electrons, surface plasmons [3][4][5] are excited and are accompanied with the enhancement of optical near field. The large near field at the surface comes from the electric field carried by the metal, which is optimized by a proper matching of the geometry, the incident light, the metallic electric permittivity and dielectric environment. Nanostructures of noble metals strongly scatter and absorb light when the surface plasmon resonance (SPR) is excited [6]. The resonance frequency and intensity are dominated by the distribution of the polarization charge across the nanostructure [7]. This resonant enhancement has promoted many important applications, such as surface-enhanced Raman scattering [8], *Corresponding author (email: qhgong@pku.edu.cn) biosensors and nanometer plasmonic waveguides [9-12], optical antennas [13], solar cells [14,15], nonlinear optical frequency mixing [16][17][18] and so on.Currently, we can see a rapidly expanding array of metallic nanostructures. With the development of nanofabrication and nanolithography techniques, various metallic nanoparticles, such as nanospheres, nanoshells, nanorices, nanorings, nanostars, nanocages and nanotriangles, have been successfully fabricated [9]. For the nanostructures smaller than the electron mean-free path of the bulk metal, the dielectric permittivity becomes position-dependent. Generally, when the scale of nanostructure is larger than 10 nm, dielectric permittivity is approximately looked as position-independent. Nanorods and nanostrips have attracted particular attention because the longitudinal plasmon absorption bands are tunable with their aspect ratio changing from visible to near-infrared [19][20][21]. Xia and coworkers have managed to synthesize 100-nm-length nanobars and studied their scattering spectra [22]. Due to the adjustability

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Avoiding crossing of dielectric resonances in three-component composites

Cited by 16 publications

References 19 publications

Enhanced nonlinear optical responses of materials: Composite effects

Enhanced nonlinear optical responses of materials: Composite effects

Interplay of plasmon resonances in binary nanostructures

Solving surface plasmon resonances and near field in metallic nanostructures: Green’s matrix method and its applications

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