Circular dichroism enhancement in plasmonic nanorod metamaterials

Vestler, Daniel; Shishkin, Ivan I.; Gurvitz, Egor A.; Nasir, Mazhar E.; Ben-Moshe, Assaf; Slobozhanyuk, Alexey P.; Krasavin, Alexey V.; Levi-Belenkova, T.; Shalin, Alexander S.; Ginzburg, Pavel; Markovich, Gil; Zayats, Anatoly V.

doi:10.1364/oe.26.017841

Cited by 72 publications

(33 citation statements)

References 40 publications

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“…Carbon frame structures (fullerenes and nanotubes) are used as additives that increase the strength of the created material. The high strength and high elasticity of nanotubes is a rather successful combination, which makes it possible to improve the mechanical properties of the material [ 34 ]. It is possible to create new nanomodified materials using the high strength characteristics and elasticity of nanotubes [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

Creation of a Nanomodified Backfill Based on the Waste from Enrichment of Water-Soluble Ores

et al. 2022

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The paper analyzes losses during the development of low-value water-soluble ore deposits. The importance of development systems with backfill is shown. The use of industrial wastes of water-soluble ores to replace specially produced inert components in the preparation of backfill seems to be a good way to utilize them. The aim of the work was to create a fill mass with improved strength properties based on industrial wastes of water-soluble ores activated with a nanomodifying material. The characteristics (chemical and granulometric compositions) of an aggregate of the backfill based on the waste from enrichment of water-soluble ores are given. The validation of the hardening mixture compositions for various mining systems was carried out considering: the specified strength, the time of the artificial mass erection, the time to achieve the required strength properties of the material, which determine the possible intensity of the mining operations; method of transporting the backfill. The expediency of using a multilayer fulleroid nanomodifier astralene as a nanomodifying additive has been proved. The effect of the backfill activation with a nanomodifying additive, astralene, on the structural changes of halite wastes from the halurgic enrichment of water-soluble ores (potash) was investigated. To study the strength properties of the fill mass, the comparative analytical method was used. The strength properties of the backfill were measured in standard test periods, taking into account the intensity of hardening of the backfill material (after 7, 14, 28, 60, 90 days). To obtain reliable results, 10 backfill samples were tested at each of the scheduled dates. The shape and chemical composition of crystalline new forms were studied. Studies were performed using X-ray phase analysis and scanning electron microscopy. As a result of uniaxial compression of hardening backfill samples, the dependence of the ultimate strength on the astralene content and the hardening time were established. It has been experimentally proved that the use of a nanomodifying additive, astralene, in the backfill allows an increase in the strength properties of the created artificial mass by 1.76–2.36 times while reducing binder consumption.

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Section: Methodsmentioning

confidence: 99%

Creation of a Nanomodified Backfill Based on the Waste from Enrichment of Water-Soluble Ores

et al. 2022

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“…Here, we demonstrate that multicomponent nanostructured metamaterials can be used to significantly enhance magneto‐optical response of their inclusions by combining field enhancement, enabled by plasmonic nanostructures, and the strong anisotropy of nanorod composites . The metamaterial is fabricated using standard electrodeposition protocols and operates in the effective medium regime, known for its tolerance to small‐scale geometry variations .…”

Section: Introductionmentioning

confidence: 99%

Magneto‐Optical Metamaterials: Nonreciprocal Transmission and Faraday Effect Enhancement

Fan

Nasir

Nicholls

et al. 2019

Advanced Optical Materials

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the effective medium regime, known for its tolerance to small-scale geometry variations. [9][10][11][12][13] We present comprehensive theoretical, experimental, and numerical analysis of the electromagnetic properties of the magneto-optical metamaterial, demonstrating both the rotation of the polarization plane and nonreciprocal transmission, two phenomena that can be controlled by the direction of the external magnetic field. This enhanced response is the result of the combination of the introduced magneto-optical properties and strong anisotropy of the metamaterial. We demonstrate rotation of the polarization plane with the effective Verdet constant equivalent of at least 10 5 rad m −1 T −1 , significant enhancement with respect to bulk ferromagnetic materials, [14] suggesting that nanostructured magnetic materials have much stronger magneto-optical response than their bulk counterparts. Overall, plasmonic magneto-optical nanorods combine the benefits of sub-wavelength light manipulation offered by metamaterials and of strong magneto-optics offered by plasmonic nanocomposites, leading to a promising material platform for integrated nanophotonic applications.The magneto-optical metamaterial geometry and its optical response are illustrated in Figure 1. The composite is formed by an array of aligned plasmonic (gold) nanorods with magnetooptical (nickel) shells inside a dielectric (alumina) matrix (note that in the composites the Ni shells extend only part-way along the rod; see the Experimental Section). As follows from the geometry, in the absence of an external static magnetic field and in the limit when the unit cell is much smaller than the wavelength (a << λ 0 ), the optical response of the composite can be described by a diagonal permittivity tensor with Cartesian components = ⊥ ⊥ zẑ { , , }     . Effective medium theory can be used to relate the components of the effective permittivity  ⊥ and  zz to the permittivity of the constituent materials as well as to the geometrical parameters of a metamaterial, such as a unit cell a, and radii of the rod r 1 and of the shells around the rod r i , with i = 2, …, N. Existing analytical and numerical tools allow calculations of the optical response of metamaterials composed of rods without shells, with plasmonic and magneto-optical material constituents and in the limit r 1 << a, [1,11,13,15] as well as shelled nanorod composites, comprising nonmagneto-optical materials with arbitrary rod concentration. [12,16] Here, we present a formalism that can incorporate magneto-optical response in the effective-medium description of shelled rod metamaterials and even in the limit  r a i 2 . We consider a metamaterial with a = 64 nm, r 1 = 15 nm, and r 2 = 23 nm and assume that the Magneto-optical effects are at the heart of modern technologies providing opportunities for polarization control in laser physics and optical communications, metrology, and in high-density data storage. Here a new type of a hyperbolic magneto-optical metamaterial based on Au-Ni nanorod arrays ...

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“…Since the seminal contributions of Y. Tang and A. E. Cohen, 7 several nanophotonic platforms have been proposed to augment the sensitivity of CD experiments through the local and global enhancement of C(r), the local density of electromagnetic chirality. To mention a few, high refractive index nanoparticles, [8][9][10][11][12][13] plasmonic chiral 14,15 and nonchiral nanoantennas, [15][16][17] optical waveguides 18 and metasurfaces [19][20][21] have been explored as enablers of surface-enhanced circular dichroism and other chiral spectroscopy techniques.…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Circular Dichroism spectroscopy on periodic dual nanostructures

Lasa-Alonso¹,

Abujetas²,

Nodar³

et al. 2020

Preprint

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Increasing the sensitivity of chiral spectroscopic techniques such as circular dichroism (CD) spectroscopy is a current aspiration in the research field of nanophotonics.Enhancing CD spectroscopy depends upon of two complementary requirements: the enhancement of the electromagnetic fields perceived by the molecules under study and the conservation of the helicity of those fields, guaranteed by duality symmetry. In

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Circular dichroism enhancement in plasmonic nanorod metamaterials

Cited by 72 publications

References 40 publications

Creation of a Nanomodified Backfill Based on the Waste from Enrichment of Water-Soluble Ores

Creation of a Nanomodified Backfill Based on the Waste from Enrichment of Water-Soluble Ores

Magneto‐Optical Metamaterials: Nonreciprocal Transmission and Faraday Effect Enhancement

Surface-Enhanced Circular Dichroism spectroscopy on periodic dual nanostructures

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