Image transmission with the subwavelength resolution in microwave,terahertz, and optical frequency bands

An image transmission principle related to the transformation of the spatial spectrum of a source into modes propagating in a metamaterial with a flat isofrequency contour is proposed. This principle makes it possible to obtain a resolution much smaller than the wavelength. The proposed principle is implemented in the microwave, terahertz, and optical frequency bands with the use of a medium consisting of parallel metal wires. It is shown that the subwavelength transmission of images can be achieved in the visible optical band via the use of a periodic structure consisting of successive metal and dielectric layers. The resolution, operation bandwidth, and sensitivity to losses in component materials are estimated for all the proposed systems. The applicability of such structures in medicine, in near-field microscopy, and as components of optical data storages with increased capacity is considered.     

Nonmetallic inclusions in steel and acoustic properties of piano wire

Piano wire is a specific elastic element, which in most musical instruments is a source of sound vibrations of a specific frequency. In the production of such wire much attention is paid to an analysis of technological methods providing high functional properties for it. The present work concerns the effect of steel purity with respect to nonmetallic inclusions on the parameters of the acoustic properties of wire used for the production of strings of musical instruments.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 33–34, August, 1995.     

A condition imposed on the electromagnetic polarizability of a bianisotropic lossless scatterer

In the dipole and local field approximations, electromagnetic scatterers are modeled in terms of the polarizability tensor. The matrix elements of this tensor, which are determined by the scatterer geometry, are complex even in the absence of losses in the material. There is a criterion that the polarizability tensor must obey if the scatterers possess no dissipative losses. This condition, derived here for bianisotropic scatterers, can be applied to analytical modeling of periodic structures composed of such scattering inclusions.