Tailored self-assembled nanocolloidal Huygens scatterers in the visible

Elancheliyan, Rajam; Dezert, Romain; Castano, Sabine; Bentaleb, Ahmed; Nativ‐Roth, Einat; Regev, Oren; Barois, P.; Baron, Alexandre; Mondain‐Monval, Olivier; Ponsinet, Virginie

doi:10.1039/d0nr05788f

Cited by 11 publications

(16 citation statements)

References 40 publications

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“…Merging the two dipolar resonances is of considerable interest to enable high efficiency broadband forward scattering. [ 15 ] The electric and magnetic Mie resonances can be overlapped by reducing the refractive index, [ 16 ] employing clusters of particles, [ 17 ] introducing shape anisotropy [ 6,15 ] or designing a core–shell architecture. [ 18,19 ] Spherical core–shell particles are insensitive to the direction and polarization of the incident light and thus have advantages over anisotropic particles.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…16,17 droplets. 18 In the multipolar regime, the so-called generalized Kerker (GK) condition is achieved when the superposition of symmetric (or even) multipoles is equal to that of odd multipoles. 19 The odd/even parity is defined with respect to the radiated electric field distribution.…”

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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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“…They realized this metamaterial by carefully engineering metaatoms to exhibit strong magnetic dipolar resonances. The ability to design meta-atoms with specific electric and magnetic dipoles-and even multipoles-has enabled tailoring the scattering direction of individual nanoobjects [15,16]. In principle, by achieving an adequate distribution of radiating multipoles, it is possible to produce any angular radiation pattern.…”

Section: Tailored Optical Propertiesmentioning

confidence: 99%

Bottom-up synthesis of meta-atoms as building blocks in self-assembled metamaterials: recent advances and perspectives

et al. 2022

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Meta-atoms interact with light in interesting ways and offer a large range of exciting properties. They exhibit optical properties inaccessible by natural atoms but their fabrication is notoriously difficult because of the precision required. In this perspective, we present the current research landscape in making meta-atoms, with a focus on the most promising self-assembly approaches and main challenges to overcome, for the development of materials with novel properties at optical frequencies.

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Tailored self-assembled nanocolloidal Huygens scatterers in the visible

Abstract: Existing nanocolloidal optical resonators presenting strong magnetic resonances often suffer from multi-step low yield synthesis routes as well as a limited tunability, in particular in terms of spectral superposition of...

Cited by 11 publications

References 40 publications

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

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

Toward Huygens’ Sources with Dodecahedral Plasmonic Clusters

Bottom-up synthesis of meta-atoms as building blocks in self-assembled metamaterials: recent advances and perspectives

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