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Unique properties of carbon nanotubes (CNTs) such as high anisotropy could be utilised in liquid crystal (LC) medium and it may improve the physical properties of the host medium. In this regard, e...

A five-level atomic system is proposed in vicinity of a two-dimensional (2D) plasmonic nanostructure with application in atom-photon entanglement. The behavior of the atom-photon entanglement is discussed with and without a control laser field. The amount of atom-photon entanglement is controlled by the quantum interference created by the plasmonic nanostructure. Thus, the degree of atom-photon entanglement is affected by the atomic distance from the plasmonic nanostructure. In the presence of a control field, maximum entanglement between the atom and its spontaneous emission field is observed.

We investigate the Goos-Hanchen (GH) shifts of a laser for V-type three-level atoms with a fourth auxiliary level in a constant cavity structure. In the presence of interference mechanisms induced by spontaneous emission and incoherent pumping, the lateral shifts of the reflected and transmitted laser field switch from positive to negative just by the rates of direct and indirect incoherent pump fields. In the presence of quantum interference, the maximum lateral shifts of the reflected laser field appear. In this case, the sensitivity is $$9.39 \times 10^{6} \lambda$$ . Also, maximum lateral shifts of the reflected and transmitted laser field reach in zero field detuning.

We consider a four-level molecular system with two ground-state vibrational levels and two excited-state vibrational levels inside a constant cavity configuration. We discuss the reflected and transmitted Goos–Hänchen (GH) shifts of a positive and negative single-chirped laser pulse. The impacts of the laser field detuning, intensity of applied laser field, and appropriately tuning the chirp rate on GH shifts are then analyzed. It is also found that this sensor is very sensitive to the refractive index of the intracavity medium, which can coherently be controlled by the medium parameters. The results show that such a sensor can be most effective for detecting biological molecules with low concentration than the large number density, where a bit variation in the concentration of sample will lead to a great variation on the GH shifts.