Aluminum Cayley trees as scalable, broadband, multiresonant optical antennas

Simon, Thomas; Li, Xiaoyan; Martin, Jérôme; Khlopin, Dmitry; Stéphan, Odile; Kociak, Mathieu; Gérard, Davy

doi:10.1073/pnas.2116833119

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…2). As more Au is deposited, the islands connect electrically and form complex sinuous gold structures that can absorb various incident wavelengths 46 . The complex patterns at the percolation limit absorb all incident wavelengths in the NIR, reaching maximum absorption.…”

Section: Design Spectral Properties and Structure Of Metamaterialsmentioning

confidence: 99%

Transparent sunlight-activated antifogging metamaterials

et al. 2022

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Counteracting surface fogging to maintain surface transparency is significant to a variety of applications including eyewear, windows, or displays. Energy-neutral, passive approaches predominately rely on engineering the surface wettability, but suffer from nonuniformity, contaminant deposition and lack of robustness, all significantly degrading their durability and performance. Here, guided by nucleation thermodynamics, we design a transparent, sunlight-activated, photothermal coating to inhibit fogging. The metamaterial coating contains a nanoscopically thin percolating gold layer and is most absorptive in the nearinfrared range, where half of the sunlight energy resides, thus maintaining visible transparency.The photoinduced heating effect enables sustained and superior fog prevention (4-fold improvement) and removal (3-fold improvement) compared to uncoated samples, and overall impressive performance, in-and outdoors, even under cloudy conditions. The extreme thinness (~10 nm) of the coating-produced with standard, readily scalable fabrication processesenables integration beneath existing coatings, rendering it durable even on severely compliant substrates.

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Section: Design Spectral Properties and Structure Of Metamaterialsmentioning

confidence: 99%

Transparent sunlight-activated antifogging metamaterials

et al. 2022

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“…EELS has emerged as the ideal technique to characterize hybrid metamaterials on the nanoscale. [27][28][29][30] EELS is able to to excite and spatially probe surface and bulk plasmons. Thereby, chemical information can be obtained from the bulk plasmon peak of plasmonic nanostructures as the energy of the bulk plasmon is directly proportional to the electron density.…”

Section: Resultsmentioning

confidence: 99%

Strong Coupling in Two‐Phase Metamaterials Fabricated by Sequential Self‐Assembly

Wohlwend

Haberfehlner

Galinski

2023

Advanced Optical Materials

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Self‐assembly processes provide the means to achieve scalable and versatile metamaterials by “bottom‐up” fabrication. Despite their enormous potential, especially as a platform for energy materials, self‐assembled metamaterials are often limited to single phase systems, and complex multi‐phase metamaterials have scarcely been explored. A new approach based on sequential self‐assembly (SSA) that enables the formation of a two‐phase metamaterial (TPM) composed of a disordered network metamaterial with embedded nanoparticles (NPs) is proposed. Taking advantage of both the high‐spatial and high‐energy resolution of electron energy loss spectroscopy (EELS), inhomogeneous localization of light in the network is observed, concurrent with dipolar and higher‐order localized surface plasmon modes in the nanoparticles. Moreover, it is demonstrated that the coupling strength deviates from the interaction of two classical dipoles when entering the strong coupling regime. The observed energy exchange between two phases in this complex metamaterial, realized solely through self‐assembly, implies the possibility to exploit these disordered systems for plasmon‐enhanced catalysis.

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“…EELS has emerged as the ideal technique to characterize hybrid metamaterials on the nanoscale. [24][25][26][27] EELS is able to to excite and spatially probe surface and bulk plasmons. Thereby, chemical information can be obtained from the bulk plasmon peak of plasmonic nanostructures as the energy of the bulk plasmon is directly proportional to the electron density.…”

Section: Chemical Analysis By Mapping Bulk Plasmon Modesmentioning

confidence: 99%

Sequential Self-Assembly for Scalable Fabrication of Disordered Two-Phase Metamaterials

Wohlwend¹,

Haberfehlner²,

Galinski³

2023

Preprint

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Self-assembly processes provide the means to achieve scalable and versatile metamaterials by "bottom-up" fabrication. Despite their enormous potential, especially as a platform for energy materials, self-assembled metamaterials are often limited to single phase systems, and complex multi-phase metamaterials have scarcely been explored. We propose a new approach based on sequential self-assembly that enables the formation of a two-phase metamaterial composed of a disordered network metamaterial with embedded nanoparticles. Taking advantage of both the high-spatial and high-energy resolution of electron energy loss spectroscopy, we observe inhomogeneous localization of light in the network, concurrent with dipolar and higher-order localized surface plasmon modes in the nanoparticles. Moreover, we demonstrate that the coupling strength deviates from the interaction of two classical dipoles when entering the strong coupling regime. The observed energy exchange between two phases in this complex metamaterial, realized solely through self-assembly, implies the possibility to exploit these disordered systems for plasmon-enhanced catalysis.

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Aluminum Cayley trees as scalable, broadband, multiresonant optical antennas

Cited by 9 publications

References 38 publications

Transparent sunlight-activated antifogging metamaterials

Transparent sunlight-activated antifogging metamaterials

Strong Coupling in Two‐Phase Metamaterials Fabricated by Sequential Self‐Assembly

Sequential Self-Assembly for Scalable Fabrication of Disordered Two-Phase Metamaterials

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