Karl Franzens University Graz | Graz University of Technology | |
Taking focusing to the extreme: Is there something new? - An intermediate report from a long journey Focusing light from all directions in 3D may be an unusual scenario but it is required for a range of experiments from efficiently coupling a single photon to a single atom in free space to reaching the Schwinger limit for the electric field, at which the quantum vacuum will turn into a plasma. |