The rich photonic world of plasmonic nanoparticle arrays

Wang, Weijia; Ramezani, Mohammad; Väkeväinen, Aaro I.; Törmä, Païvi; Rivas, Jaime Gómez; Odom, Teri W.

doi:10.1016/j.mattod.2017.09.002

Cited by 375 publications

(399 citation statements)

References 102 publications

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“…Most of these applications involve the use of ensembles of metallic nanostructures, which are commonly arranged in periodic geometries [20]. This, in addition to providing a response stronger than that of a single nanostructure, can also lead to collective behaviors arising from coherent interactions between the nanostructures [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Finite-size effects on periodic arrays of nanostructures

Zundel

Manjavacas

2018

J. Phys. Photonics

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Arrays of nanostructures have emerged as exceptional tools for the manipulation and control of light. Oftentimes, despite the fact that real implementations of nanostructure arrays must be finite, these systems are modeled as perfectly periodic, and therefore infinite. Here, we investigate the legitimacy of this approximation by studying the evolution of the optical response of finite arrays of nanostructures as their number of elements is increased. We find that the number of elements necessary to reach the infinite array limit is determined by the strength of the coupling between them, and that, even when that limit is reached, the individual responses of the elements may still display significant variations. In addition, we show that, when retardation is negligible, the resonance frequency for the infinite array is always redshifted compared to the single particle. However, in the opposite situation, there could be either a blue-or a redshift. We also study the effects of inhomogeneity in size and position of the elements on the optical response of the array. This work advances the understanding of the behavior of finite and infinite arrays of nanostructures, and therefore provides guidance to design applications that utilize these systems.

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Section: Introductionmentioning

confidence: 99%

Finite-size effects on periodic arrays of nanostructures

Zundel

Manjavacas

2018

J. Phys. Photonics

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“…An interesting plasmonic system where strong coupling has been observed and utilized are metal nanoparticle arrays. In these arrays, the localized plasmonic resonances of the nanoparticles hybridize with diffracted orders of the periodic structure, forming lattice modes called surface lattice resonances (SLRs) [10,11,12]. The SLR modes couple to the absorption line of emitters, for example organic dye molecules, and reach the strong coupling regime as evidenced by the square root dependence of the Rabi splitting on the emitter concentration as reported by Väkeväinen et al [13].…”

Section: Introductionmentioning

confidence: 90%

Strong coupling between organic dye molecules and lattice modes of a dielectric nanoparticle array

et al. 2019

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Plasmonic structures interacting with light provide electromagnetic resonances which result in a high degree of local field confinement enabling the enhancement of light-matter interaction. Plasmonic structures typically consist of metals which, however, suffer from very high ohmic losses and heating. High-index dielectrics, on the other hand, can serve as an alternative material due to their low-dissipative nature and strong scattering abilities. We study the optical properties of a system composed of all-dielectric nanoparticle arrays covered with a film of organic dye molecules (IR-792), and compare these dielectric arrays with metallic nanoparticle arrays. We tune the light-matter interaction by changing the concentration in the dye film and report the system to be in the strong coupling regime. We observe a Rabi splitting between the surface lattice resonances (SLRs) of the nanoparticle arrays and the absorption line of the dye molecules of up to 253 meV and 293 meV, for the dielectric and metallic nanoparticles, respectively. The Rabi splitting depends linearly on the square root of the dye molecule concentration , and we further assess how the Rabi splitting depends on the film thickness for a low dye molecule concentration. For thinner films of thicknesses up to 260 nm, we observe no visible Rabi splitting. However, a Rabi splitting evolves at thicknesses from 540 nm to 990 nm. We perform finite-difference time-domain simulations to analyze the near-field enhancements for the dielectric and metallic nanoparticle arrays. The electric fields are enhanced by a factor of 1200 and 400, close to the particles for gold and amorphous silicon, respectively, and the modes extend over half a micron around the particles for both materials.

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“…[1] The discovery and understanding of plasmonic effects in the early 20th century set a landmark in this direction, enabling the confinement of light into subwavelength volumes, thereby revolutionizing the fabrication of optical and photonic materials. [2][3][4] A surface plasmon is created by the coherent oscillation of conduction electrons at a metalÀ dielectric interface, in response to an external electromagnetic field. If the dimensions of the metallic object are smaller than the wavelength of the exciting radiation, plasmons become localized, resulting in absorption and scattering of photons at specific resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐Assisted Symmetry Breaking in Colloidal Gold Nanocrystal Growth

et al. 2020

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Colloidal anisotropic gold nanocrystals play a central role in the field of plasmonics owing to their tunable optical activity across a wide spectral range. However, achieving sufficient optical quality for practical implementation requires advanced synthetic protocols yielding gold nanocrystals with the desired morphology and plasmonic properties. This Minireview focuses on a fundamental step during the growth of anisotropic nanocrystals, namely symmetry breaking. In connection with thermodynamic and kinetic control of nanocrystal growth, we discuss the complex interplay between the role of seed morphology and that of surfactants, shape-directing additives and reducing agents. We revisit some iconic syntheses of anisotropic gold nanoparticles, including nanorods, nanotriangles, and nanobipyramids. Finally, we analyze the use of co-surfactants as an emerging strategy to disconnect the symmetry breaking event from the anisotropic growth process, overcoming current limitations in the synthesis of anisotropic gold nanocrystals. 2 3 4 5 6 7 8

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The rich photonic world of plasmonic nanoparticle arrays

Cited by 375 publications

References 102 publications

Finite-size effects on periodic arrays of nanostructures

Finite-size effects on periodic arrays of nanostructures

Strong coupling between organic dye molecules and lattice modes of a dielectric nanoparticle array

Surfactant‐Assisted Symmetry Breaking in Colloidal Gold Nanocrystal Growth

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