共查询到17条相似文献,搜索用时 140 毫秒
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利用格林函数方法量子化色散吸收介质中的电磁场,针对由三层色散吸收介质组成的一维光学系统,研究其中光场的量子理论,借助起伏一耗散定理给出色散吸收介质光腔中光场量子起伏的功率谱,并通过数值计算结果分析和讨论介质的色散吸收性质对光学器件工作性能的影响。结果表明,系统的工作状态与所选光场频率密切相关,并且每一区域中介质的色散吸收性不但影响自身区域的电场起伏功率谱,而且明显地连带另一侧介质中电场起伏功率谱的变化行为。此结果对于研究复杂的介质分布与结构体系在光通信、现代光学工程、微波技术等领域中的实际应用有着重要的指导意义。 相似文献
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色散吸收非对称介质光腔中光场的量子理论 总被引:7,自引:2,他引:5
利用格林函数方法对色散吸收介质中的电磁场量子化,研究了由色散吸收介质构成的非对称介质光腔中光场的量子理论,并分析了非对称性对光腔量子性质、工作性能等的影响. 相似文献
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利用全量子力学的方法从理论上研究了利用经典光场相干控制半导体量子点-金属纳米线复合体系中表面等离子体传输特性. 计算中假设金属纳米线表面等离子体具有线性色散关系,半导体量子点具有梯形三能级结构. 分析表明:通过加或不加经典光场,可以控制表面等离子体被反射还是透射;加上光场后,反射峰、透射峰的位置以及两反射峰之间的距离都可以由经典光场控制.
关键词:
表面等离子体
量子点
散射 相似文献
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在V型系统中原子相干对吸收—色散关系的影响 总被引:1,自引:1,他引:0
在V型能级系统原子介质中,若利用外场产生相干,则弱光场在该介质中的吸收-色散关系将展现出新的特性.特别是当弱场具有某一特定频率时,介质对光的吸收为零但光折射率大于1. 相似文献
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量子化电磁场在色散吸收有限介质中的传播 总被引:8,自引:3,他引:5
通过量子化吸收和色散介质中的电磁场,研究线极化波垂直入射至吸收和色散介质界面处的反射和折射行为,给出介质界面处光的正则量子理论. 相似文献
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从Ⅱ类匹配倍频过程的半经典运动方程出发,讨论了阈值以下三共振Ⅱ类倍频过程中两个非简并基频光模为振幅压缩光场时产生的谐振倍频光场的量子起伏特性。通过对输入基频光场的振幅压缩调节来实现对倍频光场压缩度的控制。结果表明在这个系统中基频光场的量子起伏直接控制着倍频光场的量子起伏。这种以非线性过程实现的量子信息调控在量子通讯及量子网络中具有重要的意义。 相似文献
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M. K. Khadivi Borougeni L. Rajaei A. Gharaati S. Miraboutalebi 《Physics of Wave Phenomena》2018,26(1):56-62
We study the conditions for the anomalous transmission of electromagnetic waves through quantum overdense plasma. We show that this anomalous transmission is triggered due to the excitation of surface waves, as was observed in the classical overdense plasma. The conditions for the excitation of surface waves are obtained by studying the dispersion relation within the framework of quantum hydrodynamics. The corresponding consequences at the classical limits are consistent with the previous studies. In comparison with the classical regimes, the quantum dispersion curve exhibits an asymptotic behavior which indicates significant effects, in particular, at large wavelengths. Herein, to create the required evanescent waves, we consider the quantum plasma to be placed between two ordinary prisms and dielectrics. The effects of the main parameters, such as the permittivity of the prisms and dielectrics and the Fermi velocity, on the rate of the transmission and the magnetic field propagation are also evaluated. 相似文献
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The modification of initially entangled light pulses passing through noisy quantum channels, modeled by dispersive and absorbing four-port devices, is studied with the help of recently obtained results on quantum state transformations. The fidelity and indices of quantum correlations based on the von Neumann entropy are calculated. Their dependence on both the pulse shape and the four-port device parameters is studied. It is shown that due to dispersion and absorption, the quantum correlations are reduced, and they decrease with increasing initial entanglement. 相似文献
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There are both loss and dispersion characteristics for most
dielectric media. In quantum theory the loss in medium is generally
described by Langevin force in the Langevin noise (LN) scheme by
which the quantization of the radiation field in various homogeneous
absorbing dielectrics can be successfully actualized. However, it is
invalid for the anisotropic dispersion medium. This paper extends
the LN theory to an anisotropic dispersion medium and presented the
quantization of the radiation field as well as the transformation
relation between the homogeneous and anisotropic dispersion media. 相似文献
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M.F. Bishop 《Solid State Communications》1976,20(8):779-783
We calculate the transmission and reflection coefficients for electromagnetic radiation incident normally on the surfaces of thin, spatially dispersive, absorbing, dielectric films. Results are obtained for four models of spatially dispersive dielectrics and for the case in which spatial dispersion is neglected. For each model the effects of spatial dispersion are to introduce additional fine structure into the transmission and reflection coefficients, regarded either as functions of frequency or of the thickness of the film. In addition, the results reveal an interleaving between the maxima and minima of the spectra for different models, which may provide a basis for an experimental discrimination between different phenomenological models for the nonlocal dielectric constant of a spatially dispersive dielectric medium. 相似文献
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M. Sahrai R. Nasehi M. Memarzadeh H. Hamedi J. B. Poursamad 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,65(3):571-579
Absorptive and dispersive properties of a four-level Λ-type atomic
system with two fold lower levels are investigated. The effect of quantum interference
induced by incoherent pump and spontaneous emission upon the absorption, dispersion, and
group index is them discussed. In addition, the rate of an incoherent pump field and the
intensity of coupling field on light propagation is also presented. 相似文献
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The dispersive properties of three-dimensional magnetized plasma photonic crystals composed of homogeneous magnetized plasma spheres immersed in isotropic dielectric host with face-centered-cubic lattices are theoretically studied based on plane wave expansion method, as the magneto-optical Faraday effects of magnetized plasma are considered. The equations for calculating the band structures are theoretically deduced. The photonic band gap and a flatbands region can be obtained. The influences of host dielectric constant, plasma collision frequency, filling factor, external magnetic field and plasma frequency on the dispersive properties are investigated in detail, respectively, and some corresponding physical explanations are also given. The numerical results show that the photonic band gap can be manipulated by the plasma frequency, filling factor, external magnetic field and host dielectric constant, respectively. However, the plasma collision frequency has no effects on photonic band gap. The location of flatbands region cannot be tuned by any parameters except for the plasma frequency and external magnetic field. 相似文献