Metaparticles: dressing nano-objects with a hyperbolic coating

Pan Wang; Alexey Krasavin; Francesco Viscomi; Ali Adawi; Jean-Sebastien Bouillard; Lei Zhang; Diane J. Roth; Limin Tong; Anatoly Zayats

doi:10.1002/lpor.201800179

Metaparticles: dressing nano-objects with a hyperbolic coating

Pan Wang, Alexey Krasavin, Francesco Viscomi, Ali Adawi, Jean-Sebastien Bouillard, Lei Zhang, Diane J. Roth, Limin Tong, Anatoly Zayats

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Abstract

The ability to engineer the optical response of a plasmonic nano-object is highly desired to achieve better control over light-matter interactions. Due to the sensitivity of plasmon resonances to the surrounding media, isotropic dielectric coating is an easy approach to modify the optical properties of a plasmonic nanostructure. However, the choice of coatings and the provided tunability is limited by the range of refractive indices of available materials. Here, we show that coating of plasmonic nano-objects with an anisotropic metamaterial, which displays a hyperbolic dispersion and allows the design of refractive index on demand, provides greater flexibility to engineer their interaction with light. This is experimentally demonstrated by coating Au nanospheres with alternating SiO2 and Au multishells, which creates rich and highly tunable plasmonic modal structures covering a broad wavelength range (~400-2200 nm) and produces high local field intensity enhancement (~500 fold). The concept is extended to hyperbolic coating of dielectric nano-objects, confirming the nature of the modes to be related to the resonances in the hyperbolic layer. The implemented approach using coating with an engineered effective refractive index may find applications in plasmon-enhanced spectroscopy, nanolasers, nonlinearity design, photothermal conversions, and hot-electron generation.

Original language	English
Article number	1800179
Pages (from-to)	1-10
Journal	Laser and Photonics Reviews
Volume	12
Issue number	11
Early online date	2 Oct 2018
DOIs	https://doi.org/10.1002/lpor.201800179
Publication status	Published - Nov 2018

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Metaparticles: dressing nano-objects_WANG_Accepted17September2018Publishedonline2October2018_GREEN AAMAccepted author manuscript, 1.47 MB

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title = "Metaparticles: dressing nano-objects with a hyperbolic coating",

abstract = "The ability to engineer the optical response of a plasmonic nano-object is highly desired to achieve better control over light-matter interactions. Due to the sensitivity of plasmon resonances to the surrounding media, isotropic dielectric coating is an easy approach to modify the optical properties of a plasmonic nanostructure. However, the choice of coatings and the provided tunability is limited by the range of refractive indices of available materials. Here, we show that coating of plasmonic nano-objects with an anisotropic metamaterial, which displays a hyperbolic dispersion and allows the design of refractive index on demand, provides greater flexibility to engineer their interaction with light. This is experimentally demonstrated by coating Au nanospheres with alternating SiO2 and Au multishells, which creates rich and highly tunable plasmonic modal structures covering a broad wavelength range (~400-2200 nm) and produces high local field intensity enhancement (~500 fold). The concept is extended to hyperbolic coating of dielectric nano-objects, confirming the nature of the modes to be related to the resonances in the hyperbolic layer. The implemented approach using coating with an engineered effective refractive index may find applications in plasmon-enhanced spectroscopy, nanolasers, nonlinearity design, photothermal conversions, and hot-electron generation.",

author = "Pan Wang and Alexey Krasavin and Francesco Viscomi and Ali Adawi and Jean-Sebastien Bouillard and Lei Zhang and Roth, {Diane J.} and Limin Tong and Anatoly Zayats",

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AU - Wang, Pan

AU - Krasavin, Alexey

AU - Viscomi, Francesco

AU - Adawi, Ali

AU - Bouillard, Jean-Sebastien

AU - Zhang, Lei

AU - Roth, Diane J.

AU - Tong, Limin

AU - Zayats, Anatoly

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N2 - The ability to engineer the optical response of a plasmonic nano-object is highly desired to achieve better control over light-matter interactions. Due to the sensitivity of plasmon resonances to the surrounding media, isotropic dielectric coating is an easy approach to modify the optical properties of a plasmonic nanostructure. However, the choice of coatings and the provided tunability is limited by the range of refractive indices of available materials. Here, we show that coating of plasmonic nano-objects with an anisotropic metamaterial, which displays a hyperbolic dispersion and allows the design of refractive index on demand, provides greater flexibility to engineer their interaction with light. This is experimentally demonstrated by coating Au nanospheres with alternating SiO2 and Au multishells, which creates rich and highly tunable plasmonic modal structures covering a broad wavelength range (~400-2200 nm) and produces high local field intensity enhancement (~500 fold). The concept is extended to hyperbolic coating of dielectric nano-objects, confirming the nature of the modes to be related to the resonances in the hyperbolic layer. The implemented approach using coating with an engineered effective refractive index may find applications in plasmon-enhanced spectroscopy, nanolasers, nonlinearity design, photothermal conversions, and hot-electron generation.

AB - The ability to engineer the optical response of a plasmonic nano-object is highly desired to achieve better control over light-matter interactions. Due to the sensitivity of plasmon resonances to the surrounding media, isotropic dielectric coating is an easy approach to modify the optical properties of a plasmonic nanostructure. However, the choice of coatings and the provided tunability is limited by the range of refractive indices of available materials. Here, we show that coating of plasmonic nano-objects with an anisotropic metamaterial, which displays a hyperbolic dispersion and allows the design of refractive index on demand, provides greater flexibility to engineer their interaction with light. This is experimentally demonstrated by coating Au nanospheres with alternating SiO2 and Au multishells, which creates rich and highly tunable plasmonic modal structures covering a broad wavelength range (~400-2200 nm) and produces high local field intensity enhancement (~500 fold). The concept is extended to hyperbolic coating of dielectric nano-objects, confirming the nature of the modes to be related to the resonances in the hyperbolic layer. The implemented approach using coating with an engineered effective refractive index may find applications in plasmon-enhanced spectroscopy, nanolasers, nonlinearity design, photothermal conversions, and hot-electron generation.

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JO - Laser and Photonics Reviews

JF - Laser and Photonics Reviews

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Metaparticles: dressing nano-objects with a hyperbolic coating

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