Abstract
In this paper we discuss the fabrication and the electromagnetic (EM) characterization of anisotropic eutectic metamaterials, consisting of cylindrical polaritonic LiF rods embedded in either KCl or NaCl polaritonic host. The fabrication was performed using the eutectics directional solidification self-organization approach. For the EM characterization the specular reflectance at far infrared, between 3 THz and 11 THz, was measured and also calculated by numerically solving Maxwell equations, obtaining good agreement between experimental and calculated spectra. Applying an effective medium approach to describe the response of our samples, we predicted a range of frequencies in which most of our systems behave as homogeneous anisotropic media with a hyperbolic dispersion relation, opening thus possibilities for using them in negative refractive index and imaging applications at THz range.
Highlights
With the recent emerging technology of THz sources, such as Quantum Cascade Lasers (QCL) [1], the possibility of exploring and exploiting the THz regime of the electromagnetic spectrum becomes more and more appealing
Applying an effective medium approach to describe the response of our samples, we predicted a range of frequencies in which most of our systems behave as homogeneous anisotropic media with a hyperbolic dispersion relation, opening possibilities for using them in negative refractive index and imaging applications at THz range
It has been proposed that specific metamaterial properties, like artificial magnetism and negative refractive index, can be achieved using high-index dielectrics instead of metals [11,12,13], where the role of the required current is undertaken by the strong displacement current
Summary
With the recent emerging technology of THz sources, such as Quantum Cascade Lasers (QCL) [1], the possibility of exploring and exploiting the THz regime of the electromagnetic spectrum becomes more and more appealing. The coupling of the electromagnetic radiation with the transverse optical phonons, which occurs in the THz regime, can be described by a resonant electrical permittivity response of Lorenz type, characterized by both strong positive and negative permittivity regimes This can make polaritonic materials a perfect replacement of either metals or high index dielectrics in the THz regime. Structuring properly such materials, one can achieve metamaterial properties like negative effective permeability [13, 15] or negative refractive index [12], and/or manipulate the dispersion of THz waves in unique ways, exploiting the interplay between material and structure (geometry) resonances.
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