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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

All optically controlled steering of light

Qingqing Sun, Yuri V. Rostovtsev, Muhammad Suhail Zubairy

Published Feb 9, 2006• 3 citations
Publisher

Abstract

We propose a scheme that provides all optically controlled steering of light beam. The system is based on steep dispersion of coherently driven medium. Using eikonal equation, we study the steering angle, the spread of optical beam, and the limits set by residual absorption of medium under conditions of electromagnetically induced transparency (EIT). Implementation of another scheme for ultra-short pulses is also discussed.

DOI
10.1117/12.660184

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We propose a scheme that provides all optically controlled steering of light beam. The system is based on steep dispersion of coherently driven medium. Using eikonal equation, we study the steering angle, the spread of optical beam, and the limits set by residual absorption of medium under conditions of electromagnetically induced transparency (EIT). Implementation of another scheme for ultra-short pulses is also discussed.
We have shown that quantum interference in a driven quasi-degenerate two-level atomic system can be controlled by an externally applied magnetic field. We demonstrate that the mechanism of optical control is based on quantum interference, which allows one to implement both electromagnetically induced transparency and electromagnetically induced absorption in one atomic system. Dispersion of such the medium allows one to control group velocity of propagation of light pulses be ultra-slow or superluminal via applied magnetic field.
We propose a scheme for guiding light by the modulated electromagnetically induced transparency (EIT) in a three-level atomic system. By using a periodically modulated control field, the linear and nonlinear susceptibilities are changed cyclically for the probe field, which results in the deflection of propagation direction of the probe beam. Propagation direction/path and output position of the probe soliton in the modulated EIT medium can be controlled precisely via adjusting the modulation period of the control field. By changing its initial amplitude, the probe beam can also be guided to a desired output position in the atomic system, driven by a periodic control field. These properties offer a novel way of soliton control, based on the modulated EIT effect.
Summary form only given. Electromagnetically induced transparency (EIT) refers to a phenomenon, whereby the optically resonant transition is rendered nearly transparent by applying a strong coupling laser field. The mechanism of EIT is usually explained in terms of quantum coherence or quantum interference. This EIT has attracted increasing interest because absorption associated with nonlinear optical processes can be removed. In the typical three-level /spl lambda/-system, which includes the ground state and the metastable state, when the atomic population is prepared in the superposition of the states by the coupling fields, the optical response of the media to the probe field is significantly modified. Since this is a coherent control of an electric field by another field via the atomic coherence, several schemes to control light coherently have been suggested. We propose an optical coherent control scheme of the polarization of optical pulses using the EIT quantum coherence, and numerically study its applicability to fast optical switching.