Interplay between electromagnetically induced transparency and Autler-Townes effect in fivelevel atomic systems

Gul Tiaz,Fazal Ghafoor,Ehtiram Shahalyev,Rashid Nazmitdinov,S Bondarenko,A Malakhov,V Burov

doi:10.1051/epjconf/201920403013

Gul Tiaz, Fazal Ghafoor + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201920403013

Copy DOI

Abstract

We analyse the evolution of a weak probe optical field propagation through a five-level atomic medium cyclically driven by two strong optical and microwave fields. It is shown that the competition between the electromagnetically induced transparency and the Autler-Townes effect can be controlled by altering the relative phase of the coupling fields in the presence of the atomic dephasing reservoir.

Highlights

Asymmetric Fano resonance, discussed in a seminal work by Ugo Fano [1], provides a remarkable concept, employed in various fields of physics nowadays
At its base is the interference effect between indistinguishable probability amplitudes of bound-to-continuum and, through auto-ionizing channel, the indirect bound-to-continuum transitions of ionized atom [1,2,3,4,5]. This concept helps to understand numerous interesting optical phenomena such as coherent population trapping [6], lasing without inversion [7], optically controlled slowing of light [8] and optical storage [9]. All these phenomena are the manifestation of the electromagnetically induced transparency (EIT) that is closely related to the Fano resonance [10]
Upon increase in the intensity of two optical fields and microwave fields, we note that the dressed states with their energy eigenvalues at relative phase: 0, π/2 and π, are separated from each other in each case

Summary

Introduction

Asymmetric Fano resonance, discussed in a seminal work by Ugo Fano [1], provides a remarkable concept, employed in various fields of physics nowadays. At its base is the interference effect between indistinguishable probability amplitudes of bound-to-continuum and, through auto-ionizing channel, the indirect bound-to-continuum transitions of ionized atom [1,2,3,4,5] This concept helps to understand numerous interesting optical phenomena such as coherent population trapping [6], lasing without inversion [7], optically controlled slowing of light [8] and optical storage [9]. The long-lived coherence in alkali metals and their simple electronics level structure made it possible to demonstrate the EIT experimentally It has been investigated as well in quantum dots [11], nanoplasmonics [12, 13], superconducting circuits [14], metamaterials [15, 16], optomechanics [17], and inductively (capacitively) coupled electrical resonator circuits [18, 19].

The Model

Response function of the medium

Coherent evolution of the triple EIT

Coherent evolution of dynamical Stark quartet dressed state

Competition of coherence controlled triple EIT with ATE

Conclusion