  The ability to control resonant properties of individual metamolecule in a
metamaterial structure will offer an ultimate freedom for dynamically shaping
wavefronts of electromagnetic radiation for applications such as variable
aberration corrected planar lenses, dynamic holograms and spatial intensity and
phase modulators. Here we report the first demonstration of a metamaterial
where resonant properties of every individual metamolecule can be continuously
controlled at will thus offering an ultimate freedom in achieving a dynamic
control of electromagnetic wavefront of microwave radiation. We call this a
Random Access Reconfigurable Metamaterial (RARM). To achieve a RARM we created
an array of cavities that were filled with liquid metal in a precise fashion
using microfluidic technology. The developed RARM was used provide the first
demonstration of a tunable flat lens.
