Properties and utilization in time-dependent Rydberg EIT

Transient response of four -level cold Rb atoms with light and microwave (MW) fields is investigated via electromagnetically induced transparency (EIT) theoretically. The local control laser acts as a switch. When the control field is weak, the population transition channel from state 53D5/2 to state 5S1/2 is closed, which leads to that the transient absorption for the probe field monotonically decreases to its steady state. Nevertheless, when the control field becomes strong, the transition channel is open, which gives rise to that the transient absorption for the probe laser will be oscillatorily damped to the steady-state value, and transient negative absorption appears. A third MW field can induce splitting of the time -dependent EIT transmission spectrum, and the stable splitting distance shows a linear dependence on the continuous MW electric (E) field strength. Furthermore, the simulation results show that the temporal medium transmission signals are sensitive to the E -field strength of local MW pulse, and can be used to sense pulsed MW fields.