Control of Goos–Hänchen shift via input probe field intensity

• In this article, we studied the amplitude control of the GH shift in the reflected light via probe field detuning. We investigated a giant GH shift for small values of probe field intensity. The amplitude of the GH shift decreases for higher values of probe field intensity.

We suggest a scheme to control Goos–Hänchen (GH) shift in an ensemble of strongly interacting Rydberg atoms, which act as super-atoms due to the dipole blockade mechanism. The ensemble of three-level cold Rydberg-dressed (87Rb) atoms follows a cascade configurations where two fields, i.e, a strong control and a weak field are employed [D. Petrosyan, J. Otterbach, and M. Fleischhauer, Phys. Rev. Lett. 107, 213601 (2011)]. The propagation of probe field is influenced by two-photon correlation within the blockade distance, which are damped due to the saturation of super-atoms. The amplitude of GH shift in the reflected light depends on the intensity of probe field. We observe large negative GH shift in the reflected light for small values of the probe field intensities.