Active absorption of electromagnetic pulses in a cavity
  We show that a pulse of electromagnetic radiation launched into a cavity can be completely absorbed into an infinitesimal region of space, provided one has a high degree of control over the current flowing through this region. We work out explicit examples of this effect in a cubic cavity and a cylindrical one, and experimentally demonstrate the effect in the microwave regime. 
S. A. R. Horsley, R. N. Foster, T. Tyc, and T. G. Philbin
physics.optics