Three-component gyrotropic metamaterial

Abstract

Negative refractive index metamaterials in the visible spectrum based on Mg B 2 ∕ Si C composites Appl. Phys. Lett. 95, 023306 (2009);All of the proposed ever since designs of metamaterials are characterized by ever-increasing sophistication of fabrication methods. Here, a comparatively simple recipe for the fabrication of a metamaterial, which is both gyrotropic and of the simultaneously negative permittivity and permeability, is proposed. The idea is to make a mixture of three ingredients, where one of them would be responsible for the negativity of l, while the other two would be responsible for the negativity of e. The first component of the mixture is the "swarm" of single-domain ferromagnetic nanoparticles, immersed in a mixture of other two, silver and mercury cadmium telluride. By carrying out the computer simulations, the domains of gyromagnetic metamaterial exist, relative to all parameters characterizing the model, that is, the temperature, external magnetic field, parameters of nano-particles, and the fraction of cadmium in Hg 1Àx Cd x Te-compound as well as relative concentrations of the mixture components are established. V C 2014 AIP Publishing LLC.

New Type of Composite Gyrotropic Metamaterial

“…In our calculations, B was restricted to 0.8 T. On the other hand, in some circumstances it could be an advantage, since switching magnetic field on and off, one can trigger on/off the left-handedness or rather, the state of matter when the material becomes metamaterial. The metamaterial which was examined by us previously [1] and which contained Hg 1−x Cd x Te, in most of the cases studied by us exhibited relatively great imaginary parts of ε and µ, which means that it would be characterized by significant losses. Sometimes one can encounter with the statement that the losses render photonic negative refraction-index media useless [6].…”

“…The expressions for permittivities for silver particles (ε 1 (ω)) and magnetic nanoparticles (ε 2 (ω)) were derived in [1]. One should note here that due to the fact that Ag is a very good conductor, we have used the Drude theory, whereas to obtain the relation for (ε 3 (ω)) we assumed the intermediate value of its real part and added the imaginary part of it in the following way: ε 3 (ω) = 12.5 + 4 i (see e.g.…”

“…The model used in the paper is basically the same as in our previous work [1], where the theoretical and numerical examinations of three-component metamaterial have been done. As we have shown there, the mixture of appropriately chosen three components, where one of them is responsible for the magnetic properties of mixture, and the other two contribute to the negativity of real part of effective permittivity (in some range of frequency domain), may result in a negative index of refraction of such medium.…”

“…1, in paper [1] for one of the mixture components there was chosen Hg 1−x Cd x Te semiconductor compound. The point however is that in the fabrication process of Hg 1−x Cd x Te there involves mercury, which is very poisoning.…”

New composite gyrotropic double-negative metamaterial

“…It is worth mentioning that most of the proposed ever since designs of metamaterials were characterized by everincreasing sophistication of fabrication methods. Contrary to these, in our previous work [1], we proposed a relatively simple way to produce metamaterial using the mixture of three ingredients, where the one was responsible for the negativity of Re½lðxÞ and the other two for the negativity of Re½e eff ðxÞ.…”