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题名	量子相干诱导多能级原子系统负折射率材料及其光学特性研究
作者	张红军
学位类别	博士
答辩日期	2008
授予单位	中国科学院上海光学精密机械研究所
导师	龚尚庆
关键词	多能级原子系统 量子相干 负折射 相位控制 克尔非线性
其他题名	Study on the quantum coherence induced negative refractive index materials and their optical properties in multilevel atomic systems
中文摘要	负折射率材料光学特性研究是近年来光学和材料科学等交叉前沿领域的重要研究内容。其研究成果不仅推动了光学学科的发展，丰富了物理学的内容，而且对于实现新材料具有重要的现实意义。由于负折射率材料所特有的反常光学效应，使得其在超分辨成像、空间滤波、光束整形和光学存储等方面有重要应用价值，成为当今研究的热点之一。 本论文主要就本论文主要就量子相干诱导多能级原子系统中负折射率材料的产生及其光学特性进行了研究，取得的主要创新性研究成果包括： 1. 利用量子干涉和原子相干原理，分别在类Lambda型V型四能级原子系统中电磁诱导产生了光频波段的负折射率。研究发现负折射的频带宽度和介质的吸收完全由外加的控制场决定，通过调节场的强度和失谐量可以实现低损耗甚至于无吸收的负折射材料。通过比较两种原子系统发现V型四能级原子系统方案更容易诱导产生较宽频带的低吸收负折射率材料。 2. 探讨了场的相对相位对原子介质折射率的调制作用。在环型四能级原子系统中，考虑到电磁感应手征性的作用，相对相位对手性系数具有周期性的调制作用。所以通过调节相对相位介质的折射率可以从正值变为负值或者由负值变为正值，从而实现了右手材料与左手材料的相互转变。 3. 首次研究了原子系统负折射介质的克尔非线性特性。研究发现，由于量子相干作用，调节控制场和泵浦场可以实现无吸收的巨克尔非线性。这种左手材料即可以实现很强的聚焦或者散焦的效应又起到对于传输波的相位补偿作用和倏逝波的振幅补偿作用。
英文摘要	Study on optical properties of negative refractive index materials is an important content of the frontier of the cross research of Optics, Materials Science and other disciplines. The research findings of optical properties of negative refractive index materials not only propel the development of these subjects but also have significant in realization on new materials. Because of the anti-optical properties of the negative refractive index materials, it has potential applications in subwavelength imaging, space filtering, beam shaping, optical store and so on. In this thesis, we mainly investigate the quantum coherence induced negative refractive index materials and their optical properties in multilevel atomic systems. The main results are: (1). Based on the principle of atomic coherence and the effect of quantum interference, we realize the negative refractive index in a four-level Lambda-type atomic system and a V-type atomic system, respectively. We find that the negative refraction band and the absorption can be controlled by the external applied fields. The negative refractive index materials with reduced absorption, even to zero absorption, can be obtained by adjusting the amplitudes and detunings of the applied fields. Compared with these two cases, the V-type scheme is easier to realize the negative refractive index with very small absorption. (2). We investigate the modulation effect of the relative phase of the applied fields to the realization the negative refractive index in a four-level loop atomic system. Owe to the periodical dependence relationship of chriality coefficients on relative phase of the applied fields, the refractive index can be changed from positive to negative or vice versa by adjusting relative phase. Then, the atomic medium can be switching from right-handed to left-handed materials or vice versa in this scheme. (3). The Kerr nonlinearity of a left-handed material is firstly analyzed in a four-level atomic system. It is shown that a large enhanced Kerr nonlinearity accompanied by vanishing absorption can be realized via choosing appropriate parameters in this negative refraction atomic medium. It not only shows the large nonlinearity such as focusing or defocusing but also acts as the phase and amplitude compensating effects.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15376]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	张红军. 量子相干诱导多能级原子系统负折射率材料及其光学特性研究[D]. 中国科学院上海光学精密机械研究所. 2008.

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