3 ms·

Another "superluminal group velocity" or?

• whoisburbansky 5y ago
  That's exactly, what this is. In particular, they manage to create a set up demonstrating strong anomalous dispersion, so that in the medium, longer wavelengths become slower (you'd usually expect longer wavelengths to have higher phase velocity), whereas shorter wavelengths become faster. The reshapes your pulse in such a way that the group velocity ends up appearing negative.
  • Keyframe 5y ago
    Alright, so a move towards more in-depth understanding of interaction of group velocity with medium in these situations / observations.. not as media spun it towards "faster than light" BS. Media's gonna med, I guess. Still valuable research, but phenomenon is decades old (in research).