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Journal of Modern Optics

Dual bands of negative refraction with low absorption in a quasi-Λ four-level left-handed atomic system

Xiaoyu Yang, Yongyuan Jiang

Published Sep 1, 2013• 0 citations
Publisher

Abstract

Dual bands of left-handedness are obtained in a quasi- four-level atomic system. In our system, multichannel quantum interference plays a very important role on the realization of dual bands. It is shown that the permeability can realize negative values in dual bands of this four-level atomic system. Moreover, the permittivity and permeability can simultaneously realize negative values in the same frequency band. It can be found that the atomic system exhibits negative refraction with low absorption in each left-handed frequency band. At some certain frequencies, this left-handed atomic system can obtain zero absorption.

DOI
10.1080/09500340.2013.832816

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Dual bands of left-handedness are obtained in a quasi- four-level atomic system. In our system, multichannel quantum interference plays a very important role on the realization of dual bands. It is shown that the permeability can realize negative values in dual bands of this four-level atomic system. Moreover, the permittivity and permeability can simultaneously realize negative values in the same frequency band. It can be found that the atomic system exhibits negative refraction with low absorption in each left-handed frequency band. At some certain frequencies, this left-handed atomic system can obtain zero absorption.
We suggest a scheme for obtaining negative refraction with low absorption in a left-handed atomic system.Under the the appropriate conditions,the atomic system displays negative refraction with negative permittivity and permeability(Left-handedness)in a common frequency range,simultaneously.And the imaginary parts of permittivity and permeability show transparently propagate in the same frequency range.Finally,the negative refraction show low absorption due to the EIT effect,and the figure of merit demonstrated this in this resonant atomic system.
This paper intends to realize negative refraction with absorption suppressed by the electromagneticly induced transparency(EIT) in a dense four-level atomic system. Without the two equal transition frequencies responding to the probe field, the atomic system displays a negative refraction with the simultaneously negative permittivity and negative permeability(Left-handedness). The response of the probe field is amplified and propagates transparency in some frequency extents. Therefore, our aim for searching the low-loss negative refraction can be achieved in the scheme, given the main applied limitation of the negative refractive materials is the large amount of dissipation and absorption. However, an excessive signal field intensity would increase the absorption near the resonance in our scheme.
A new mechanism for realizing negative refractive index with a four-level atomic system is suggested. The explicit expressions for the electric permittivity and magnetic permeability at probe frequency are presented. It is shown that there is a frequency band in which the four-level photonic-resonant atomic vapour may exhibit simultaneously negative permittivity and permeability, and that such an atomic vapour may become a left-handed material (negatively refracting medium). Compared with the previous schemes to realize negative refraction within the framework of classical electromagnetic theory, the most remarkable features of the present scenario are as follows: (i) isotropic material with microscopic structure units at atomic-scale level, (ii) negative refraction in visible and infrared frequency bands, (iii) controllable manipulation by external fields and (iv) based on quantum coherence in a multilevel atomic system.
The system of inverted Y-type four-level atoms interacting with multi-mode light fields is discussed. Through the mechanism of quantum interference, the relative dielectric permittivity and the relative magnetic permeability will changed remarkably. Using appropriately chosen parameters, the real parts of both the relative dielectric permittivity and the relative magnetic permeability will be negative, and then the left handedness effect happens and the left-handed material is realized. The properties of left-handed materials such as the range of frequencies of the negative refractive index can be manipulated via changing certain parameters of the system.