Eur. Phys. J. D (2014) 68: 150
https://doi.org/10.1140/epjd/e2014-50100-1

Regular Article

Electromagnetically induced transparency for a double Fano-profile system

¹ Quantum Optics and Engineering Division, Institute of Physics, University of Zielona Góra, Prof. Z. Szafrana 4a, 65-516 Zielona Góra, Poland
² Vinh University, 182 Le Duan Street, Vinh City, Vietnam
³ Faculty of Physics, University of Warsaw, 00-681 Warsaw, 69 Hoża, Poland
⁴ RCPTM, Joint Laboratory of Optics of Palacký University and Institute of Physics of AS CR, Faculty of Science, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic

^a e-mail: caolongvanuz@gmail.com

Received: 3 February 2014
Received in final form: 28 March 2014
Published online: 23 June 2014

Abstract

A Λ-like model of atomic levels involving two auto-ionizing states is considered. The levels are irradiated by two external electromagnetic fields, a strong driving and a weak probing ones. The analytical formula for medium susceptibility shows an additional electromagnetically induced transparency window caused by the second auto-ionizing level. Characteristics of both transparency windows are analyzed depending on parameters of auto-ionizing levels and the external driving field. Manipulation of these characteristics seems to be very effective because of their large sensitivity with respect to the parameters involved in the problem. This manipulation becomes even more feasible when considered model is implemented in so-called laser-induced continuum structure.