Controlling of the spatially dependent absorption spectrum by quantum interference

In this paper, the spatially dependent probe absorption is investigated in a five-level cascade atomic system. We consider that four control fields interact with the atomic transitions forming a closed-loop structure, and a weak probe field is applied between the ground states and the lowest excited state. It is shown that the narrowing of the probe absorption profile is controllable by the intensities of the four driving fields. More interestingly, we find that the radial modification of electromagnetically induced transparency (EIT) is possible to obtain by simply increasing the numbers of the orbital angular momentum (OAM) of the vortex fields. In addition, the Doppler broadening effect on the spatially dependent EIT is also discussed briefly, demonstrating that various spatial absorption distributions are obtainable in different cases. The internal mechanisms can be attributed to the triple quantum interference effect according to the dressed-state analysis. It is possible to find potential applications in quantum information storage and high-dimensional quantum communications.