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We realized and experimentally tested a conceptually new kind of electrically thin absorbers of electromagnetic waves. The idea is to utilize a single layer of precisely designed meta-atoms. This allows one to design an absorber with unprecedentedly small thickness. The absorber implies absence of a ground plane. High efficiency of the realized structure in the S band is demonstrated. The conceptual...
The properties of an artificial anisotropic structure formed by microhelices have been numerically simulated by the example of a specially designed sample. The sample contains paired helices with right- and left-handed twisting directions, due to which the metamaterial chirality is compensated for. Helices are characterized by precalculated optimal parameters; as a result, the permittivity and permeability...
In this article we study scattering of plane electromagnetic waves by a metal cylinder surrounded by straight copper wires. Possibility to achieve partial recovery of the wave front behind the cylinder is demonstrated with certain parameters of the wires and their location in the structure. Reconstruction of the wave front is observed in frequency range from 3.04 GHz to 3.15 GHz.
Uniaxial electrically thin layers formed by arrays of smooth helices are under study. Simple and smooth shape of the helices makes them more preferable from experimental point of view in comparison to other chiral particles. Here we optimize by simulation mutual orientation and density of the helices in the array so that it acts as a twist-polarizer or a perfect absorber.
The possibility of linearly polarized electromagnetic microwave conversion into a circularly polarized wave using single-turn helices with preliminary calculated optimal parameters is demonstrated. The helices are characterized by equal dielectric, magnetic, and chiral susceptibilities. Such optimal helices can be further used, for example, to develop reflectionless coatings and metamaterials with...
Investigation of polarizing properties of DNA is chosen as one of primary importance due to mirror asymmetry of the shape of DNA. Preliminary theoretical calculation has shown that the form of DNA is optimum for radiation of a circular electromagnetic wave under the resonance condition (~10 nm). This conclusion has been proved for the metal DNA-like helices in a microwave range in accordance with...
The effects related with formation of induced anisotropy in natural-isotropic media, have been studied already for a long time. These phenomena interest scientists first of all due to a rare opportunity of control of artificial anisotropy of media, and also due to an opportunity of the energy transfer to a propagating acoustic or an electromagnetic wave. The idea of the nonlinear interaction of an...
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