Coherent control of negative refraction based on local-field enhancement and dynamically induced chirality

doi:10.1088/1674-1056/19/7/074208

Abstract This paper studies the electromagnetic response of a coherently driven dense atomic ensemble to a weak probe. It finds that negative refraction with little absorption may be achieved in the presence of local-field enhanced interaction and dynamically induced chirality. The complex refractive index governing the probe refraction and absorption depends critically on the atomic density, the steady population distribution, the coherence dephasings, and the frequency detunings, and is also sensitive to the phase of the driving field because the photonic transition paths form a close loop. Thus, it can periodically tune the refractive index at a fixed frequency from negative to positive values and vice versa just by modulating the driving phase. Moreover, the optimal negative refraction is found to be near the probe magnetic resonance, which then requires the electric fields of the probe and the drive being on two-photon resonance due to the dipole synchronisation.

Keywords: negative refraction dynamically induced chirality local field enhancement electromagnetically induced transparency

Revised: 14 December 2009
Accepted manuscript online:

PACS:	42.50.Md	(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	42.60.Fc	(Modulation, tuning, and mode locking)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10874057).

Cite this article:

Ba Nuo (巴诺), Gao Jin-Wei (高金伟), Tian Xing-Xia (田杏霞), Wu Xi (吴熙), Wu Jin-Hui (吴金辉) Coherent control of negative refraction based on local-field enhancement and dynamically induced chirality 2010 Chin. Phys. B 19 074208

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Coherent control of negative refraction based on local-field enhancement and dynamically induced chirality

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