Hii all.. Is it possible to design a lens(using magnetic fields, dielectric media etc) so as to focus an existing electric field on to a localized region on a electrode. I hope the following picture illustrates what I am trying to do. What I need is a electric field which is considerably high on a small region at the center compared to that on the outside. The electric field need not be static but could be pulsating too. Since I am thinking of length scales of around 1 μm, I cannot use very sharp objects, hence I cannot use a pointed electrode. http://picasaweb.google.co.in/lh/photo/oyuH1fKyDbU2d5kN9gUFbw?feat=directlink The figure above shows a simple version of the configuration I am interested in. Figure A shows the configuration and the electric field variation on the bottom electrode when no "lens" is placed within. Figure B shows the configuration and the graph with the lens within the plates. The graph in figure B shows the desired electric field variation over the surface of the bottom electrode.