Interparticle Coupling Effects on Plasmon Resonances of Nanogold Particles

Su, Kai-Hung; Wei, Qi‐Huo; Zhang, Xiang; Mock, Jack J.; Smith, David R.; Schultz, S.

doi:10.1021/nl034197f

Cited by 1,496 publications

(1,442 citation statements)

References 27 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].…”

mentioning

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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mentioning

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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“…As the gap separation decreases, the results follow the well-known trend for sphere dimers at small separations. 8,10,17,43 The lowest energy LAP turns into a Figure 1. Schematic of the gap antennas for (a) the spherical-gap and (b) the flat-gap configurations.…”

Section: ■ Gap-antenna Morphologymentioning

confidence: 99%

The Morphology of Narrow Gaps Modifies the Plasmonic Response

et al. 2015

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ABSTRACT:The optical response of a plasmonic gapantenna is mainly determined by the Coulomb interaction of the two constituent arms of the antenna. Using rigorous calculations supported by simple analytical models, we observe how the morphology of a nanometric gap separating two metallic rods dramatically modifies the plasmonic response. In the case of rounded terminations at the gap, a conventional set of bonding modes is found that red-shifts strongly with decreasing separation. However, in the case of flat surfaces, a distinctly different situation is found with the appearance of two sets of modes: (i) strongly radiating longitudinal antenna plasmons (LAPs), which exhibit a red-shift that saturates for very narrow gaps, and (ii) transverse cavity plasmons (TCPs) confined to the gap, which are weakly radiative and strongly dependent on the separation distance between the two arms. The two sets of modes can be independently tuned, providing detailed control of both the near-and far-field response of the antenna. We illustrate these properties also with an application to larger infrared gap-antennas made of polar materials such as SiC. Finally we use the quantum corrected model (QCM) to show that the morphology of the gap has a dramatic influence on the plasmonic response also for subnanometer gaps. This effect can be crucial for the correct interpretation of charge transfer processes in metallic cavities where quantum effects such as electron tunneling are important. KEYWORDS: optical antennas, plasmonic gaps, cavity modes, antenna modes, quantum effects, quantum corrected model, plasmonic resonances, phononic resonances M etallic particles can show a strong optical response due to the excitation of resonant plasmonic modes, making light manipulation possible in structures of dimensions comparable to or smaller than the wavelength. Typical effects are the efficient emission of radiation and the concentration of the incoming light energy in small volumes, thus justifying the characterization of these metallic structures as optical antennas. 1,2 Modifications of the geometry, size, or materials 3−6 affect the optical response. In particular, the resonant modes of optical antennas consisting of two metallic particles separated by a narrow gap show significant sensitivity to the properties of the gap. 7−19 In an optical antenna, a change in geometry can simultaneously affect both the strength and wavelength of its resonances and modify both the far-and near-field response. It is usually a challenge, for example, to control the near field without affecting the far-field properties. In this theoretical work, we discuss how the coexistence 20,21 of two different and mostly spectrally decoupled types of modes in flat-gap antennas, namely, transverse cavity modes 22 and longitudinal antenna modes, 15 allows for a more flexible tuning of far-and near-field properties compared to that of the conventional spherical-gap terminations 13,17,23 The importance of the gap morphology 24 is particularly pronounced for nanometer-...

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“…Another important aspect of noble NPs, when dispersed in a dielectric matrix, is that their optical response strongly depends on their clustering tendency, namely the clusters size, shape and distribution [3,35,36], the interaction between them [7,37], but also on the host matrix dielectric function itself [11,[38][39][40][41].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Microstructural evolution of Au/TiO2 nanocomposite films: The influence of Au concentration and thermal annealing

et al. 2015

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Nanocomposite thin films consisting of a dielectric matrix, such as titanium oxide (TiO 2 ), with embedded gold (Au) nanoparticles were prepared and will be analysed and discussed in detail in the present work. The evolution of morphological and structural features was studied for a wide range of Au concentrations and for annealing treatments in air, for temperatures ranging from 200 to 800 ºC. Major findings revealed that for low Au atomic concentrations (at. %), there are only traces of clustering, and just for relatively high annealing temperatures, T ≥ 500 ºC. Furthermore, the number of Au nanoparticles is extremely low, even for the highest annealing temperature, T = 800 ºC.It is noteworthy that the TiO 2 matrix also crystallizes in the anatase phase for annealing temperatures above 300 ºC.

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Interparticle Coupling Effects on Plasmon Resonances of Nanogold Particles

Cited by 1,496 publications

References 27 publications

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

Interaction effects on the magneto-optical response of magnetoplasmonic dimers

The Morphology of Narrow Gaps Modifies the Plasmonic Response

Microstructural evolution of Au/TiO2 nanocomposite films: The influence of Au concentration and thermal annealing

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