Transition from Isolated to Collective Modes in Plasmonic Oligomers

Hentschel, Mario; Saliba, Michael; Vogelgesang, Ralf; Gießen, Harald; Alivisatos, A. Paul; Liu, Na

doi:10.1021/nl101938p

Cited by 561 publications

(587 citation statements)

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“…Fanoresonant structures can exhibit very large local field enhancements (6, 7), making these structures prime candidates for nonlinear frequency generation. Although previous studies of nonlinear plasmonics used nanostructures with a single dipolar resonance (8, 9), in a multiinput process such as FWM, the conversion efficiency is expected to be further enhanced if the plasmon modes of the nanostructure are resonant with both input frequencies (10).In this study, we demonstrate highly efficient FWM from a plasmonic nanocluster that supports two distinct Fano resonances (FRs) (6,7,(11)(12)(13)(14). When excited by a coherent source, the two spatially coherent FRs oscillate collectively, in a mixed frequency analog to a two-state quantum system, where the electric fields from the two modes add coherently, resulting in strong field enhancements.…”

mentioning

confidence: 73%

“…In this study, we demonstrate highly efficient FWM from a plasmonic nanocluster that supports two distinct Fano resonances (FRs) (6,7,(11)(12)(13)(14). When excited by a coherent source, the two spatially coherent FRs oscillate collectively, in a mixed frequency analog to a two-state quantum system, where the electric fields from the two modes add coherently, resulting in strong field enhancements.…”

mentioning

confidence: 92%

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Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing

Wen

Zhen

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

206

190

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Plasmonic nanoclusters, an ordered assembly of coupled metallic nanoparticles, support unique spectral features known as Fano resonances due to the coupling between their subradiant and superradiant plasmon modes. Within the Fano resonance, absorption is significantly enhanced, giving rise to highly localized, intense near fields with the potential to enhance nonlinear optical processes. Here, we report a structure supporting the coherent oscillation of two distinct Fano resonances within an individual plasmonic nanocluster. We show how this coherence enhances the optical four-wave mixing process in comparison with other doubleresonant plasmonic clusters that lack this property. A model that explains the observed four-wave mixing features is proposed, which is generally applicable to any third-order process in plasmonic nanostructures. With a larger effective susceptibility χ (3) relative to existing nonlinear optical materials, this coherent double-resonant nanocluster offers a strategy for designing high-performance thirdorder nonlinear optical media.nanostructured materials | nonlinear optics | phase matching T raditionally, nonlinear optical phenomena have relied on crystalline media that combine material susceptibilities and phase matching to optimize nonlinear optical processes. It has recently been shown that certain plasmonic nanostructures can produce an enhanced nonlinear response when excited at their resonant frequency (1, 2). Phase-matching requirements (3-5) for nonlinear optics in macroscopic media are usually optimally fulfilled at nanoscale dimensions [sinc 2 (Δk z/2) ∼1 for small z, where z is the propagation distance through the medium]. For plasmonic nanostructures, the most important property for the enhancement of nonlinear properties is their increased local fields at resonance, which can provide larger effective susceptibilities than their intrinsic material susceptibility.In the third-order nonlinear process of four-wave mixing (FWM), two external fields E 0 (ω 1 ) and E 0 (ω 2 ) are simultaneously incident on the nanostructure, inducing local fields E(ω 1 ) and E(ω 2 ); absorbing two ω 2 and one ω 1 photons and emitting a photon at ω FWM = 2ω 2 − ω 1 (Fig. 1A) (3). The electromagnetic FWM enhancement G FWM = jE(ω 2 )/E 0 (ω 2 )j 4 · jE(ω 1 )/E 0 (ω 1 )j 2 thus depends on the field enhancements at the input frequencies. Fanoresonant structures can exhibit very large local field enhancements (6, 7), making these structures prime candidates for nonlinear frequency generation. Although previous studies of nonlinear plasmonics used nanostructures with a single dipolar resonance (8, 9), in a multiinput process such as FWM, the conversion efficiency is expected to be further enhanced if the plasmon modes of the nanostructure are resonant with both input frequencies (10).In this study, we demonstrate highly efficient FWM from a plasmonic nanocluster that supports two distinct Fano resonances (FRs) (6,7,(11)(12)(13)(14). When excited by a coherent source, the two spatially coherent FRs oscillate...

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confidence: 73%

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confidence: 92%

Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing

Wen

Zhen

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

206

190

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“…Smart nanoscale systems are able to interact with light in an intricate fashion [1], which is strongly dependent on the internal electromagnetic interaction between the constituent elements of the system. Plasmonic structures composed of a number of individual elements, for example, give rise to Fano resonance effects that induce electromagnetically induced transparency (EIT) [2][3][4][5][6][7][8]. Similar phenomena have also been found in magnetoplasmonic nanosystems [9], i.e., those sharing magnetic and plasmonic functionalities and that therefore allow a further degree of freedom, namely, the external control of the system response [10][11][12][13][14].…”

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confidence: 80%

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

Sousa

Froufe‐Pérez

Armelles³

et al. 2014

Phys. Rev. B

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The effect that dipole-dipole interactions have on the magneto-optical (MO) properties of magnetoplasmonic dimers is theoretically studied. The specific plasmonic versus magnetoplasmonic nature of the dimer's metallic components and their specific location within the dimer play a crucial role in the determination of these properties. We find that it is possible to generate an induced MO activity in a purely plasmonic component, even larger than that of the MO one, therefore dominating the overall MO spectral dependence of the system. Adequate stacking of these components may allow one to obtain, for specific spectral regions, larger MO activities in systems with a reduced amount of MO metal and therefore with lower optical losses. Theoretical results are contrasted and confirmed with experiments for selected structures. Smart nanoscale systems are able to interact with light in an intricate fashion [1], which is strongly dependent on the internal electromagnetic interaction between the constituent elements of the system. Plasmonic structures composed of a number of individual elements, for example, give rise to Fano resonance effects that induce electromagnetically induced transparency (EIT) [2][3][4][5][6][7][8]. Similar phenomena have also been found in magnetoplasmonic nanosystems [9], i.e., those sharing magnetic and plasmonic functionalities and that therefore allow a further degree of freedom, namely, the external control of the system response [10][11][12][13][14]. By an adequate design of their internal structure, it is possible to obtain configurations which provide enhanced magnetooptical (MO) activity upon plasmon resonance excitation [15][16][17][18], which allow one to probe the electromagnetic (EM) field distribution inside a metallic nanoelement [19], or which yield high MO activity and low optical losses with MO figures of merit comparable with those of garnet structures [13]. Furthermore, in dimers where one of the elements is purely plasmonic and the other is of magnetoplasmonic nature, interaction effects cause the magnetoplasmonic component to induce MO activity in the plasmonic one (which intrinsically lacks MO activity) [20]. For specific interelement distances, which determine the interaction between them, this brings as a consequence the equivalent of the EIT in the MO spectrum of the system, i.e., a cancellation of the MO activity in a narrow spectral range due to the competition between the intrinsic MO contribution of the magnetoplasmonic component and the induced MO contribution of the plasmonic one [20]. As this effect exhibits a narrow spectral feature in the MO response, it may find applications in sensing and telecommunication areas, and a complete understanding will help in the development of novel sensing and biosensing architectures as well as MO devices.* a.garcia.martin@csic.esIn this context, these induced MO activity effects and their influence on the overall MO activity of the system for specific ranges of interaction lead to the consideration of additional issues where th...

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“…This approach has recently been transferred to the study of strongly coupled nanoparticles and identical hybridized nano-systems, such as plasmonic oligomers 7,8,9 . An excellent survey of this field is reported in Ref.…”

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confidence: 99%

Breaking the Mode Degeneracy of Surface Plasmon Resonances in a Triangular System

et al. 2012

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ABSTRACT:In this paper, we present a systematic investigation of symmetry-breaking in the plasmonic modes of triangular gold nanoprisms. Their geometrical C 3 symmetry is one of the simplest possible that allows degeneracy in the particle's mode spectrum. It is reduced to the non-degenerate symmetries C v or E by positioning additional, smaller gold nanoprisms in close proximity, either in a lateral or a vertical configuration. Corresponding to the lower symmetry of the system, its eigenmodes also feature lower symmetries (C v ), or preserve only the identity (E) as symmetry. We discuss how breaking the symmetry of the plasmonic system not only breaks the degeneracy of some lower order modes, but also how it alters the damping and eigenenergies of the observed Fano-type resonances.

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Transition from Isolated to Collective Modes in Plasmonic Oligomers

Cited by 561 publications

References 32 publications

Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing

Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

Breaking the Mode Degeneracy of Surface Plasmon Resonances in a Triangular System

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