Title: On the parametric version of black body

Biography:

Vladimir Arabadzhi, physicist and senior scientist in Institute of applied physics, complete his PhD in Radiophysics, Achivements include inventions in active wave control. Area of interests: wave thrust, reducing of acoustical and radio visibility of physical bodies.

Abstract

The alternative conception of "black body" (in the wave diffraction sense) is represented in this article for electromagnetic waves. For several decades, many researchers have tried to find a structure (constant in time, and with field representation by complex amplitudes at any frequency) of an absorbing shell that would satisfy simultaneously (jointly) the following conditions: (a) effective absorption; (b) a spatial ultra-wide absorption band (i.e. the absorption efficiency is independent of the spatial frequency or of incident wave direction), (c) an ultra-wide absorption band (i.e. the absorption efficiency does not depend on the incident wave time frequency), (d) the small thickness of the absorbing coating compared to the length of the absorbed wave and to the geometric dimension of protected body. But without full success, because any wave to be absorbed need time (more or equal to its period) and distance (more or equal to its wavelength) to have time to make a work (if we do not make conversion its frequency) on the absorber. Now remind that in all these years microelectronic technologies (designed for computational purposes and according the law Gordon Moore) have been intensively developed: the miniature and rate of the element base (or the spatial-temporal resolution). On the other hand wavelengths that were intended to be absorbed by the “black” shells remained the same due to the constant conditions of the long-range propagation of these waves. This work is an attempt to use the great successes of nano-electronics to satisfy conditions (a)-(d) jointly. The required level of nano-electronics development is very high, but quite real today. Spatial interior construction of black body is presented by thin micro-structure having boundaries like foam or, in other words, air cavities or cells (virtual resonators with oscillatory relaxation of the interior field) separated from each other by very thin walls of controlled transparency. Temporal control of these boundaries (walls) is very fast periodical switching between nonreflecting (opened walls, transparent, mutually isolated metal pieces, closed switches) and the reflecting (closed walls, opaque, like metal grid, united metal pieces, opened switches) states of walls. During transparent state the structure the structure lets in itself an incident wave without scattering. At the beginning of the reflecting state of the foam walls, “instant metallization” of walls splits the instant spatial distribution of incident wave into a lot small pieces which become the initial conditions of oscillations inside the very small virtual resonators. The minimum own frequency (in the metal cavity cannot be zero natural frequency) of the any virtual resonator is very higher than the inverse duration of incident wave propagation through the thickness of the foam-like shell. The smaller geometric dimension of the virtual resonator, the higher its minimum natural frequency.  So any part of incident wave, which came into the shell, has enough time to be absorbed. And energy of incident wave scattered by shell in its reflecting state can be much less than the energy absorbed by virtual resonators if the duration of transparent state (in each period of switching) is very greater than the reflecting state duration. Thus, the virtual resonator is a special nano-electronic chip, which does not process signals, but is a direct participant in life of waves to be absorbed.