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arXiv:1404.2045 · Physical Review A

Ultraslow helical optical bullets and their acceleration in magneto-optically controlled coherent atomic media

Chao Hang, Guoxiang Huang

Published May 8, 2013• 2 citations
arXivHTMLPDF

Abstract

We propose a scheme to produce ultraslow ($3+1$)-dimensional helical optical solitons, also called helical optical bullets, in a resonant three-level $\ensuremath{\Lambda}$-type atomic system via quantum coherence. We show that, due to the effect of electromagnetically induced transparency, the helical optical bullets can propagate with an ultraslow velocity up to ${10}^{\ensuremath{-}5}$ $c$ ($c$ is the light speed in vacuum) in the longitudinal direction and a slow rotational motion (with velocity ${10}^{\ensuremath{-}7}$ $c$) in transverse directions. The generation power of such optical bullets can be lowered to microwatts, and their stability can be achieved by using a Bessel optical lattice potential formed by a far-detuned laser field. We also show that the transverse rotational motion of the optical bullets can be accelerated by applying a time-dependent Stern-Gerlach magnetic field. Because of the ultraslow velocity in the longitudinal direction, a significant acceleration of the rotational motion of optical bullets may be observed for a very short medium length.

DOI
10.1103/physreva.87.053809

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We propose a scheme to generate (3+1)-dimensional slow-light Airy wave packets in a resonant $\ensuremath{\Lambda}$-type three-level atomic gas via electromagnetically induced transparency. We show that in the absence of dispersion the Airy wave packets formed by a probe field consist of two Airy wave packets accelerated in transverse directions and a longitudinal Gaussian pulse with a constant propagating velocity lowered to ${10}^{\ensuremath{-}5}c$ (ccc is the light speed in vacuum). We also show that in the presence of dispersion it is possible to generate another type of slow-light Airy wave packet consisting of two Airy beams in transverse directions and an Airy wave packet in the longitudinal direction. In this case, the longitudinal velocity of the Airy wave packet can be further reduced during propagation. Additionally, we further show that the transverse accelerations (or bending) of the both types of slow-light Airy wave packets can be completely eliminated and the motional trajectories of them can be actively manipulated and controlled by using a Stern-Gerlach gradient magnetic field.