High optical magnetism of dodecahedral plasmonic meta-atoms

Many, Véronique; Dezert, Romain; Duguet, Étienne; Baron, Alexandre; Jangid, Vikas; Ponsinet, Virginie; Ravaine, Serge; Richetti, P.; Barois, P.; Tréguer‐Delapierre, Mona

doi:10.1515/nanoph-2018-0175

Cited by 22 publications

(36 citation statements)

References 36 publications

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“…Lastly, we demonstrated that the solvent-induced self-assembly strategy could be extended to gold-coated clusters after slight optimisation of the experimental conditions. This opens avenues to new plasmonic building blocks with many potential applications in optics [43].…”

Section: Resultsmentioning

confidence: 98%

Clustering of asymmetric dumbbell-shaped silica/polystyrene nanoparticles by solvent-induced self-assembly

Ravaine

Duguet

2020

Journal of Colloid and Interface Science

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We report a quite simple strategy to assemble silica/polystyrene dumbbell-shaped nanoparticles into clusters with an aggregation number from two to more than 30. The polystyrene lobe serves as a patch that is made sticky and ready to merge with similar ones when the dumbbells are dispersed in an ethanol/DMF mixture. Thanks to transmission electron microscopy experiments, we describe qualitatively and quantitatively the influence of several experimental parameters such as the solvent quality, i.e. DMF fraction, and the patch-to-particle size ratio. We show that the DMF fraction range (30-50 vol. %) for the sticky regime can be extended if the incubation process is completed by a centrifugation step. We also demonstrate an unexpected evolution in the average aggregation number with the patch-to-particle size ratio that may be explained by the molar mass distribution within the polystyrene core of the clusters. Lastly, we show that this assembly route may be extended to gold-coated clusters.

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Section: Resultsmentioning

confidence: 98%

Clustering of asymmetric dumbbell-shaped silica/polystyrene nanoparticles by solvent-induced self-assembly

Ravaine

Duguet

2020

Journal of Colloid and Interface Science

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“…A colloidal suspension of silica (SiO 2 ) beads with diameter of 120 nm was used. In this size range, silica does not exhibit any Mie resonance, and, most importantly, its scattering cross‐section was simply calculated from the Mie theory [ 35,38,43 ]

\begin{matrix} \begin{matrix} left \\ σ_{⊥}^{θ = 90^{\circ}, φ = 0^{\circ}} = {(||, S_{1} (θ = 90^{\circ}))}^{2} / q^{2} = (N_{ref} normal/ N_{scat}) \cdot ({normalB}_{⊥} {/B}_{ref}) \cdot (T_{ref} (λ) \\ / T_{⊥} (λ)) \cdot σ_{ref}^{θ = φ = 90^{\circ}} \end{matrix} \end{matrix}

\begin{matrix} \begin{matrix} left \\ σ_{/ /}^{θ = φ = 90^{\circ}} = {(||, S_{2} (θ = 90^{\circ}))}^{2} / q^{2} = (N_{ref} normal/ N_{scat}) \cdot (B_{/ /} {/B}_{ref}) \cdot (T_{ref} (λ) \\ / T_{/ /} (λ)) \cdot σ_{ref}^{θ = φ = 90^{\circ}} \end{matrix} \end{matrix}

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Section: Methodsmentioning

confidence: 99%

Broadband Forward Light Scattering by Architectural Design of Core–Shell Silicon Particles

Marco

Jiang

Fang

et al. 2021

Adv Funct Materials

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A goal in the field of nanoscale optics is the fabrication of nanostructures with strong directional light scattering at visible frequencies. Here, the synthesis of Mie‐resonant core–shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum is demonstrated. The core consists of silicon surrounded by a lower index silicon oxynitride (SiOxNy) shell of an adjustable thickness. Optical spectroscopies coupled to Mie theory calculations give the first experimental evidence that the relative position and intensity of the magnetic and electric dipole resonances are tuned by changing the core–shell architecture. Specifically, coating a high‐index particle with a low‐index shell coalesces the dipoles, while maintaining a high scattering efficiency, thus generating broadband forward scattering. This synthetic strategy opens a route toward metamaterial fabrication with unprecedented control over visible light manipulation.

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“…We first synthesized a silica template with 12 dimples, according to a protocol described in details elsewhere. 1 The sample was characterized by TEM and we determined statistically that it consists of dodecahedral with a morphology yield of 70%. Other side products are silica particles with 8 dimples (6%), 9 dimples (7%), 10 dimples (7%) and mutisilica particles (10%).…”

Section: Ag Dodecapod Synthesismentioning

confidence: 99%

Toward Huygens’ Sources with Dodecahedral Plasmonic Clusters

et al. 2021

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The design and chemical synthesis of plasmonic nanoresonators exhibiting a strong magnetic response in the visible is a key requirement to the realization of efficient functional and selfassembled metamaterials. However, novel applications like Huygens' metasurfaces or mu-near-zero materials require stronger magnetic responses than those currently reported. Our numerical simulations demonstrate that the specific dodecahedral morphology, whereby 12 silver satellites are located on the faces of a nanosized dielectric dodecahedron, provides sufficiently large electric and magnetic dipolar and quadrupolar responses that interfere to produce socalled generalized Huygens' sources, fulfilling the generalized Kerker condition. Using a multistep colloidal engineering approach, we synthesize highly symmetric plasmonic nanoclusters with a controlled silver satellite size and show that they exhibit a strong forward scattering that may be used in various applications such as metasurfaces or perfect absorbers.

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High optical magnetism of dodecahedral plasmonic meta-atoms

Cited by 22 publications

References 36 publications

Clustering of asymmetric dumbbell-shaped silica/polystyrene nanoparticles by solvent-induced self-assembly

Clustering of asymmetric dumbbell-shaped silica/polystyrene nanoparticles by solvent-induced self-assembly

Broadband Forward Light Scattering by Architectural Design of Core–Shell Silicon Particles

Toward Huygens’ Sources with Dodecahedral Plasmonic Clusters

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