Physics – Quantum Physics
Scientific paper
2010-08-23
Physics
Quantum Physics
Scientific paper
We propose a method to achieve significant optical signal delays exploiting the effect of Autler-Townes splitting in an inhomogeneously broadened quantum dot medium. The absorption and slow-down effects are compared for three schemes i.e. $\Xi$, V and $\Lambda$, corresponding to different excitation configurations. Qualitative differences of the V-scheme compared to the $\Xi$- and $\Lambda$-scheme are found, which show that features of Autler-Townes splitting are only revealed in the V-scheme. The underlying physical mechanisms causing this discrepancy are analyzed and discussed. Finally we compare field propagation calculations of the schemes showing significantly larger achievable signal delays for the V-scheme despite finite absorption of the coupling field. This opens the possibility for using waveguide structures for both coupling and probe fields, thus significantly increasing the achievable signal delays.
Lunnemann Per
Mørk Jesper
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