Ultrafast population switching of quantum dots in a structured vacuum.

@article{Ma2009UltrafastPS,
  title={Ultrafast population switching of quantum dots in a structured vacuum.},
  author={Xunpeng Ma and Sajeev John},
  journal={Physical review letters},
  year={2009},
  volume={103 23},
  pages={
          233601
        }
}
We demonstrate picosecond, high-contrast population flipping of two-level atoms interacting with femtojoule optical pulses in a 3D photonic band gap waveguide. This is the result of giant Mollow splitting caused by strong light localization and a remarkable field-dependent relaxation of the atomic Bloch vector as it evolves near an abrupt jump in the electromagnetic density of states. Unlike steady-state switching, population inversion can remain nearly complete after the pulse subsides. This… 
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