Looking into Meta-Atoms of Plasmonic Nanowire Metamaterial

Tsai, Kun-Tong; Wurtz, Gregory A.; Chu, Jung‐Lien; Cheng, Tian You; Wang, Huai Hsien; Krasavin, Alexey V.; He, Jr Hau; Wells, Brian; Podolskiy, Viktor A.; Wang, Juen Kai; Wang, Yuh‐Lin; Zayats, Anatoly V.

doi:10.1021/nl501283c

Cited by 61 publications

(46 citation statements)

References 37 publications

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“…In contrast to plasmonic crystals, metamaterials have characteristic sizes of the elements and separations between them much smaller than the operating wavelength, so that they can be described by introducing effective medium parameters through the averaging over many periods. While such effective medium approach describes the linear optical properties of metamaterials (reflection, transmission and absorption) well, it should be applied to treatment of nonlinear optical properties with caution as it does not take into account the local fields inside the metamaterial composites which can vary significantly . (For the same reason, it also is not applicable for the description of the Purcell effect for the emitters inside the metamaterial …”

Section: Kerr‐type Nonlinearity and Ultrafast Nonlinear Plasmonicsmentioning

confidence: 99%

Free‐electron Optical Nonlinearities in Plasmonic Nanostructures: A Review of the Hydrodynamic Description

Krasavin

Ginzburg

Zayats

2017

Laser & Photonics Reviews

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Requirements of integrated photonics and miniaturisation of optical devices demand efficient nonlinear components not constrained by conventional macroscopic nonlinear crystals. Intrinsic nonlinear response of free carriers in plasmonic materials provides opportunities to design both second-and third-order nonlinear optical properties of plasmonic nanostructures and control light with light using Kerr-type nonlinearities as well as achieve harmonic generation. This review summarises principles of free-carrier nonlinearities in the hydrodynamic description in both perturbative and non-perturbative regimes, considering also contribution of nonlocal effects. Engineering of harmonic generation, solitons, nonlinear refraction and ultrafast all-optical switching in plasmonic nanostructures and metamaterials are discussed. The full hydrodynamic consideration of nonlinear dynamics of free carriers reveals key contributions to the nonlinear effects defined by the interplay between a topology of the nanostructure and nonlinear response of the fermionic gas at the nanoscale, allowing design of high effective nonlinearities in a desired spectral range. Flexibility and unique features of free-electron nonlinearities are important for nonlinear plasmonic applications in free-space as well as integrated and quantum nanophotonic technologies.

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Section: Kerr‐type Nonlinearity and Ultrafast Nonlinear Plasmonicsmentioning

confidence: 99%

Free‐electron Optical Nonlinearities in Plasmonic Nanostructures: A Review of the Hydrodynamic Description

Krasavin

Ginzburg

Zayats

2017

Laser & Photonics Reviews

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“…While the centrosymmetric crystal lattice of gold, limits the source of the second‐order nonlinearity to the surface nonlinear contributions, the nanostructured geometry of the Au nanorod metamaterial may exploit a large surface area with high field confinement to provide efficient second‐harmonic generation. Due to the fact that this internal structure of the metamaterial and the local fields inside the metamaterial are paramount for the description and understanding of SHG processes, the effective medium approximation for the metamaterial description is not applicable for modelling SHG processes and full‐vectorial, microscopic considerations should be employed.…”

Section: Introductionmentioning

confidence: 99%

Second‐Harmonic Generation from Hyperbolic Plasmonic Nanorod Metamaterial Slab

Marino

Segovia

Krasavin

et al. 2018

Laser & Photonics Reviews

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Hyperbolic plasmonic metamaterials provide numerous opportunities for designing unusual linear and nonlinear optical properties. In this work, second‐harmonic generation in a hyperbolic metamaterial due to a free‐electron nonlinear response of a plasmonic component of the metamaterial is studied. It is shown that owing to a rich modal structure of an anisotropic plasmonic metamaterial slab, the overlap of fundamental and second‐harmonic modes results in the broadband enhancement of radiated second‐harmonic intensity by up to 2 orders of magnitude for TM‐ and TE‐polarized fundamental light, compared to a smooth Au film under TM‐polarised illumination. Compared to the radiated second‐harmonic intensity from a bulk LiNbO3 nonlinear crystal of the same thickness, the SHG intensity from a metamaterial slab may be up to 2 orders of magnitude higher at the certain metamaterial resonances. The results open up possibilities to design tuneable frequency‐doubling integratable metamaterial with the goal to overcome limitations associated with classical phase matching conditions in thick nonlinear crystals.

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“…The spectral behavior of these resonances and their underlying nature as a function of metamaterial thickness has been thoroughly discussed elsewhere. 19,39,42,43,45,46 The analysis of Ψ in Figure 3c, d is consistent with the measured extinction of Figure 3a, b. Indeed, for | E p | > | E s |, we expect tan Ψ > 1 i.e., 45° < Ψ ≤ 90°, whereas for | E p | < | E s | we expect tan Ψ < 1, i.e., 0 ≤ Ψ < 45° with the case | E p | = | E s | corresponding to tan Ψ = 1 and Ψ = 45°.…”

Section: Resultsmentioning

confidence: 99%

In Situ Ellipsometric Monitoring of Gold Nanorod Metamaterials Growth

Morgan

Murphy

Hendren

et al. 2017

ACS Appl. Mater. Interfaces

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An in situ transmission-based system has been designed to optically monitor the ellipsometry constants of a hyperbolic plasmonic metamaterial during electrochemical growth. The metamaterial, made from an array of vertically aligned gold nanorods, has demonstrated an unprecedented ability to manipulate the polarization of light using subwavelength thickness slabs, making in situ ellipsometric data a powerful tool in the controlled design of such components. In this work, we show practical proof-of-principle of this design method and rationalize the ellipsometric output on the basis of the modal properties of the nanorod metamaterial. The real-time optical monitoring setup provides excellent control and repeatability of nanostructure growth for the design of future ultrathin optical components. The performance of the ellipsometric method was also tested as a refractive index sensor. Monitoring refractive index changes near the metamaterial’s epsilon near zero (ENZ) frequency showed a sensitivity on the order of 500°/RIU in the ellipsometric phase for a metamaterial that shows 250 nm/RIU sensitivity in its extinction.

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Looking into Meta-Atoms of Plasmonic Nanowire Metamaterial

Cited by 61 publications

References 37 publications

Free‐electron Optical Nonlinearities in Plasmonic Nanostructures: A Review of the Hydrodynamic Description

Free‐electron Optical Nonlinearities in Plasmonic Nanostructures: A Review of the Hydrodynamic Description

Second‐Harmonic Generation from Hyperbolic Plasmonic Nanorod Metamaterial Slab

In Situ Ellipsometric Monitoring of Gold Nanorod Metamaterials Growth

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