Anomalous ring-down effects and breakdown of the decay rate concept in optical cavities with negative group delay

Details Anomalous ring-down effects and breakdown of the decay rate concept in optical cavities with negative group delay Anomalous ring-down effects and breakdown of the decay rate concept in optical cavities with negative group delay

2011-07-22

arxiv.org/abs/1107.4474v3

Physics

Quantum Physics

Scientific paper

Propagation of light pulses through negative group velocity media is known to give rise to a number of paradoxical situations that seem to violate causality. The solution of these paradoxes has triggered the investigation of a number of interesting and unexpected features of light propagation. Here we report a combined theoretical and experimental study of the ring-down oscillations in optical cavities filled with a medium with such a strongly negative frequency dispersion to give a negative round-trip group delay time. We theoretically anticipate that causality imposes the existence of additional resonance peaks in the cavity transmission, resulting in a non-exponential decay of the cavity field and in a breakdown of the cavity decay rate concept. Our predictions are validated by simulations and by an experiment using a room-temperature gas of metastable helium atoms in the detuned electromagnetically induced transparency regime as the cavity medium.

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