Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical Tunability

Lassiter, J. Britt; Sobhani, Heidar; Fan, Jonathan A.; Kundu, Janardan; Capasso, Federico; Nordlander, Peter; Halas, Naomi J.

doi:10.1021/nl102108u

Cited by 614 publications

(606 citation statements)

References 38 publications

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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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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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“…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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“…We also introduce a new extended coupled oscillator model (ECO) for describing Fano interference where the radiative characteristics of the hybridized modes are calculated rather than prescribed a priori. In contrast to the conventional coupled oscillator (CCO) model, 54 the input parameters in the ECO are the plasmonic properties of the original modes which interact and naturally result in hybridized sub-and superradiant modes with narrow and broad linewidths. We experimentally verify the tunability of the Fano resonance in this structure and demonstrate the applicability of the ECO as an accurate model.…”

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Mechanisms of Fano Resonances in Coupled Plasmonic Systems

et al. 2013

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T he ability of metallic nanostructures to confine and enhance incident radiation offers unique possibilities for manipulating light at the nanoscale. These functionalities are enabled by the excitation of collective electron oscillations known as localized plasmon resonances. 1 When two or more nanostructures are placed next to each other, their plasmons can couple through near-field interactions and can give rise to a new set of hybridized collective plasmonic modes. 2À12 Plasmonic nanoclusters composed of three, 13 four, 8,14,15 seven particles, 9 and even larger aggregates 11,16 can also exhibit interference effects like Fano resonances 17À19 when the near-field coupling between each element is properly controlled. Fano resonances arise from the interference between superradiant and subradiant modes and produce extinction features with characteristic narrow and asymmetric line shapes. Because of their narrower spectral width compared to standard plasmon resonances and large induced field enhancements, Fano resonances have been used for a variety of applications including plasmonic rulers 20À22 and biosensors. 23À25 Despite a large and recent research effort, the design of plasmonic structures exhibiting Fano resonances at specific wavelengths is a challenging task because of their complex nature. A central issue in this design is the spectral engineering of the resonances via controlled hybridization of the available modes. However, this is difficult in systems where higher order modes are excited in the spectral range of interest 12,26,27 or when the modes are very complex and spatially extend over a large part of the nanostructure. 28,29 A small variation of the geometries, like what can occur during the nanofabrication process, can drastically change the resonance line shape and wavelength. This difficulty is particularly challenging when designing Fano resonant structures using spherical or disk shaped nanoparticles where the energies of the individual nanoparticle plasmons are similar and all hybridization and tuning must be accomplished by controlling the interparticle spacings.A more robust approach for Fano resonant systems is to engineer them from metallic nanorods that support highly tunable and polarization sensitive longitudinal

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Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical Tunability

Cited by 614 publications

References 38 publications

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

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

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

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