Jafar Poursamad Bonab

We consider a four-level molecular system with two ground-state vibrational levels and two excitedstate vibrational levels inside a constant cavity confguration. We discuss the refected and transmitted Goos–Hänchen (GH) shifts of a positive and negative single-chirped laser pulse. The impacts of the laser feld detuning, intensity of applied laser feld, 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 efective 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.