New polaritonic materials in the THz range made of directionally solidified halide eutectics

Merino, Rosa I.; Acosta, Maria F.; Orera, V. M.

doi:10.1016/j.jeurceramsoc.2013.10.025

Cited by 16 publications

(14 citation statements)

References 27 publications

(40 reference statements)

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“…Ultrafine eutectic structures (of sub-micron eutectic wavelength) have drawn considerable interest recently, owing to their outstanding mechanical [1][2][3][4][5], and unique optical properties [6][7][8][9][10][11][12][13] associated with the fine-scale (micron, submicron) distribution of the eutectic phases. This interest has been manifested in research projects such as the EU FP7 "ENSEMBLE" [11] aimed at creating eutectic metamaterials of special optical properties (e.g., negative refractive index, etc.…”

Section: Introductionmentioning

confidence: 99%

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Phase-field modeling of eutectic structures on the nanoscale: the effect of anisotropy

et al. 2017

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Eutectic solidification front formed in the presence of a highly anisotropic solid-liquid interfacial free energy. It has been demonstrated that the eutectic pattern is sensitive to the morphology of the solid-liquid interface. ABSTRACTA simple phase-field model is used to address anisotropic eutectic freezing on the nanoscale in two (2D) and three dimensions (3D). Comparing parameter-free simulations with experiments, it is demonstrated that the employed model can be made quantitative for Ag-Cu. Next, we explore the effect of material properties, and the conditions of freezing on the eutectic pattern. We find that the anisotropies of kinetic coefficient and the interfacial free energies (solid-liquid and solid-solid), the crystal misorientation relative to pulling, the lateral temperature gradient, play essential roles in determining the eutectic pattern. Finally, we explore eutectic morphologies, which form when one of the solid phases are faceted, and investigate cases, in which the kinetic anisotropy for the two solid phases are drastically different.

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Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11][12][13]). A variety of eutectic patterns are regarded as promising candidates [6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Phase-field modeling of eutectic structures on the nanoscale: the effect of anisotropy

et al. 2017

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“…This prediction has been experimentally confirmed [18] with the use of lithium fluoride as the filling medium, a solid compound with phonon absorption bands at THz [19].…”

Section: Absorption-induced Transparencymentioning

confidence: 56%

Terahertz gas sensor based on absorption-induced transparency

Rodrigo

2016

EPJ Applied Metamaterials

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-A system for the detection of spectral signatures of gases at the Terahertz regime is presented. The system consists in an initially opaque holey metal film whereby the introduction of a gas provokes the appearance of spectral features in transmission and reflection, due to the phenomenom of absorption-induced transparency (AIT). The peaks in transmission and dips in reflection observed in AIT occur close to the absorption energies of the molecules, hence its name. The presence of the gas would be thus revealed as a strong drop in reflectivity measurements at one (or several) of the gas absorption resonances. As a proof of principle, we theoretically demonstrate how the AIT-based sensor would serve to detect tiny amounts of hydrocyanic acid.

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“…where ε ∞ = 2.027 is the high-frequency permittivity, ε 0 = 8.705 is static permittivity, ω T is the transverse phonon resonance frequency, and Γ is the absorption factor; ω T /(2π) = 9.22 THz and Γ = 0.527 THz [48,52]. Assuming Γ = 0, the lower and upper boundaries of the polaritonic gap are set by the transverse (ω T ) and longitudinal (ω L ) phonon resonance frequencies, in line with the Lyddane-Sachs-Teller relation, ω 2 L /ω 2 T = ε 0 /ε ∞ [46].…”

Section: Materials Properties and Designmentioning

confidence: 99%

“…It can be done, in particular, by using other polar dielectrics than LiF (e.g., see Refs. [46,52]), and other values of d (see Eq. 5).…”

Section: Structures Without Lif Slabmentioning

confidence: 99%

Tunable deflection and asymmetric transmission of THz waves using a thin slab of graphene-dielectric metamaterial, with and without ENZ components

Serebryannikov¹,

Hajian²,

Beruete³

et al. 2018

Opt. Mater. Express

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Tunable deflection of obliquely incident, linearly polarized terahertz waves is theoretically studied in a wide frequency range around 20 THz, by combining a thin slab of graphene-dielectric metamaterial (with ten layers of graphene), a dielectric grating, and a uniform polar-dielectric slab operating in the epsilon-near-zero (ENZ) regime. The modulation of the deflection intensity and deflection angle is done by varying the chemical potential of graphene, and is realized with or without connection to the asymmetric transmission. It is shown to depend on the location of the graphene-dielectric metamaterial slab, as well as on the incidence angle. Four scenarios of tunable deflection are found, including the ones realizable in two-component structures without an ENZ slab.

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New polaritonic materials in the THz range made of directionally solidified halide eutectics

Cited by 16 publications

References 27 publications

Phase-field modeling of eutectic structures on the nanoscale: the effect of anisotropy

Phase-field modeling of eutectic structures on the nanoscale: the effect of anisotropy

Terahertz gas sensor based on absorption-induced transparency

Tunable deflection and asymmetric transmission of THz waves using a thin slab of graphene-dielectric metamaterial, with and without ENZ components

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