# 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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