The generation of concentrated energy of Bessel beams in an array of   concentric rings
  In recent years, the problem of the production of localized waves has been analyzed in various ways, from both a theoretical and a practical point of view. We present here a way in which to construct a suitable experimental set-up, so as to obtain highly localized energy. On the basis of a vectorial treatment already studied for a specific source (namely, a ring-shaped aperture over a metallic screen), we evaluate the amount of energy supplied by a single Bessel beam. Then, by analyzing the geometric characteristics of the experimental set-up, we can establish the position of further rings, so as to increase the localized energy to a maximum. 
Daniela Mugnai
physics.optics