Superradiant control of gamma-ray propagation by vibrating nuclear arrays
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abstract
The collective nature of light interactions with atomic and nuclear ensembles yields the fascinating phenomena of superradiance and radiation trapping. We study the interaction of rays with a coherently vibrating periodic array of two-level nuclei. Such nuclear motion can be generated, e.g., in ionic crystals illuminated by a strong driving optical laser field. We find that deflection of the incident beam into the Bragg angle can be switched on and off by nuclear vibrations on a superradiant time scale determined by the collective nuclear frequency a, which is of the order of terahertz. Namely, if the incident wave is detuned from the nuclear transition by frequency a it passes through the static nuclear array. However, if the nuclei vibrate with frequency then parametric resonance can yield energy transfer into the Bragg deflected beam on the superradiant time scale, which can be used for fast control of rays. 2013 American Physical Society.
