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A periodic layered medium, with unit cells consisting of a dielectric and an electromagnetically-induced transparency (EIT)-based atomic vapor, is designed for light propagation manipulation. Considering that a destructive quantum interference relevant to a two-photon resonance emerges in EIT-based atoms interacting with both control and probe fields, an EIT-based periodic layered medium exhibits a flexible frequency-sensitive optical response, where a very small variation in the probe frequency can lead to a drastic variation in reflectance and transmittance. The present EIT-based periodic layered structure can result in controllable optical processes that depend sensitively on the external control field. The tunable and sensitive optical response induced by the quantum interference of a multi-level atomic system can be applied in the fabrication of new photonic and quantum optical devices. This material will also open a good perspective for the application of such designs in several new fields, including photonic microcircuits or integrated optical circuits. 相似文献
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研究了双轴各向异性负折射率材料光纤中光传播特性及光子波函数几何相位的特殊性质. 为体现其拓扑与整体效应,光子几何相位必依赖于螺旋光纤中光子波函数演化路径所张开的立体角. 本研究证明,在双轴各向异性负折射率材料光纤中,因在光的传播过程中正负折射率对于光波几何相位的贡献可以相互抵消,因此光子几何相位将与光子波函数演化路径所张锥角无关. 还讨论了源于量子涨落效应的真空水平光子几何相位的物理性质以及在实验上探测这一真空效应的可能性.
关键词:
各向异性
负折射率材料
几何相位
光纤 相似文献
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正负材料交界面上光波的额外相位跃变 总被引:1,自引:0,他引:1
研究了正负材料交界面上光波因螺旋度瞬时翻转所导致的额外相位。在构造有效哈密顿量的基础之上,我们运用Lewis—Riesenfeld不变量理论及与不变量有关的么正变换方法分析和计算了这一相位。由于交界面上螺旋度倒转是一个含时过程,我们计算了其中由光子波函数获得的几何相位。光子螺旋度倒转类似数字电路0与1之间的互换操作,文中简要讨论了它可能具有的信息论意义。 相似文献
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Invariant theory and exact solutions of the time-dependent supersymmetric two-level multiphoton Jaynes-Cummings model
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On the basis of the fact that the two-level multiphoton Jaynes-Cummings (TLMJC) model possesses a supersymmetric structure, an invariant is constructed in terms of the supersymmetric generators by working in the sub-Hilbert-space corresponding to a particular eigenvalue of the conserved supersymmetric generators (the time-independent invariant). In this paper, we investigate the invariant-related unitary transformation approach to exact solutions of the time-dependent TLMJC model. 相似文献
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The present letter finds the complete set of exact solutions of the time-dependent generalized Cini model by making use of the Lewis-Riesenfeld invariant theory and the invariant-related unitary transformation formulation and, based on this, the general explicit expression for the decoherence factor is therefore obtained. This study provides us with a useful method to consider the geometric phase and topological properties in the time-dependent quantum decoherence process. 相似文献
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A scheme of nanoscale lasers based on the so-called carbon peapods is examined in detail. Since there is considerable cylindrical empty space in the middle of a single-wall carbon nanotube (SWCNT), it can serve as a laser resonant cavity that consists of two highly reflecting alignment "mirrors" separated by a distance. These mirrors refer to the ordered arrays of C6o inside SWCNTs, which have photonic bandgap structures. Meanwhile, ideally single-mode lasers are supposed to be produced in the nanoscale resonant cavity. 相似文献
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A new quantum optical mechanism to realize simultaneously negative
electric permittivity and magnetic permeability is suggested. In
order to obtain a negative permeability, we choose a proper atomic
configuration that can dramatically enhance the contribution of the
magnetic-dipole allowed transition via the atomic phase coherence. It
is shown that the atomic system chosen with proper optical parameters
can give rise to striking electromagnetic responses (leading to a
negative refractive index) and that the atomic vapour becomes a
left-handed medium in an optical frequency band. Differing from the
previous schemes of artificial composite metamaterials (based on
classical electromagnetic theory) to achieve the left-handed
materials, which consist of anisotropic millimetre-scale composite
structure units, the left-handed atomic vapour presented here is
isotropic and homogeneous at the atomic-scale level. Such an
advantage may be valuable in realizing the superlens (and hence
perfect image) with left-handed atomic vapour. 相似文献