Radio-frequency superradiance in a resonator

Iu. F. Kiselev, E.I. Aliskenderov

S. O. Elyutin, Sergey M. Zakharov, �. A. Manykin

А. В. Андреев

C. L. Davis, I. V. Kaganov, Victor K. Henner

The phenomenon of superradiation due to a resonant circuit and the backward influence of the radiation field in a standard magnetic resonance experiment is investigated. It is shown that although the effect of this phenomenon in the radio-frequency region is small, it leads to a change in the shape of the absorption line, which may be possible to observe in an appropriately designed experiment. The predicted shape of the wings of the absorption curve is unusual in magnetic resonance. This analysis, using a traditional magnetic resonance approach, compares favorably with the results of a numerical simulation of superradiation from a system of spins.

A. V. Andreev

J. H. Brownell, W J Kim, Roberto Onofrio

Recent advances in nanotechnology and atomic physics may allow for a demonstration of the dynamical Casimir effect. An array of film bulk acoustic resonators (FBARs) coherently driven at twice the resonant frequency of a high-quality electromagnetic cavity can generate a stationary state of Casimir photons. These are detected using an alkali atom beam prepared in an inverted population of hyperfine states, with an induced superradiant burst producing a detectable radio-frequency signal. We describe here the results of the simulations of the dynamics of superradiance and superfluorescence, with the aim to optimize the parameters for the detectability of Casimir photons. When the superradiant lifetime is shorter than the dissipation time, we find superradiant evolution to be similar in character but dramatically slower than in the usual lossy case.