Observation of superluminal behaviors in wave propagation

Phys Rev Lett. 2000 May 22;84(21):4830-3. doi: 10.1103/PhysRevLett.84.4830.

Abstract

The possibility of observing superluminal behavior in the propagation of localized microwaves over distances of tens of wavelengths is experimentally demonstrated. These types of waves, better than the evanescent modes of tunneling, can contribute to answering the question on the luminal limit of the signal velocity.