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International conference on fiber optics and photonics

Decay Time in a Cavity in Slow or Negative Light Regime

T. Lauprêtre, Sylvain Schwartz, Rupamanjari Ghosh, Iacopo Carusotto, Fabienne Goldfarb, Fabien Bretenaker

Published Jan 1, 2012• 0 citations
Publisher

Abstract

We investigate the decay time of a cavity containing strong dispersion achieved through electromagnetically induced transparency (EIT) in 4He*. We show that this concept is no longer relevant in the case of strong negative dispersion.
DOI
10.1364/photonics.2012.t1b.2

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The 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 a sufficiently 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.