首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 46 毫秒
1.
崔元顺  周淮玲 《大学物理》2002,21(9):20-21,31
从介质的物态方程出发,研究旋波介质的色散性质,给出了波数随旋波参量和频率变化的关系。  相似文献   

2.
耗散旋波介质中的色散关系   总被引:2,自引:2,他引:0  
崔元顺 《大学物理》2003,22(12):12-14
应用Maxwell经典电磁理论,结合旋波介质的本构关系,研究耗散旋波介质中光波的色散关系.结果表明,色散关系与介质电导率、旋波因子等因素密切相关.  相似文献   

3.
在旋波介质研究过程中,人们提出了多种形式的物质方程.由于表达形式和使用符号的不同,很容易造成误解和混淆.本文对常用的4种物质方程形式进行了推导和整理,给出了它们之间的对应关系.  相似文献   

4.
崔元顺 《大学物理》2004,23(10):25-27,31
运用并矢法求解广义Helmholtz方程,结合Fourier变换、留数定理等数学处理,给出方程的并矢Green函数解析表达式;并进一步就旋波介质给出其中色散关系的另外一种求解方法.  相似文献   

5.
熊锦  胡响明  彭金生 《物理学报》1999,48(10):1864-1868
研究非旋波近似下的激光线宽,精确到原子自然线宽与辐射频率的比值的平方.结果表明,线宽虽然仍然遵从著名的Schawlow-Townes公式,但是,由于非旋波项对稳态平均光子数的抑制作用,非旋波项引起激光线宽变宽.加宽的程度不仅依赖于原子自然线宽与辐射频率的比值的平方,而且与旋波近似下的稳态平均光子数有关.非旋波项对光子数起伏的影响较小,与之相比,非旋波项对激光线宽的影响要大得多. 关键词:  相似文献   

6.
张明  戴宏毅  欧保全  谢红卫  胡德文 《物理学报》2007,56(12):6961-6969
研究了多能级原子与多模光场的相互作用.探讨了旋波近似下N能级原子与(N-1)模光场相互作用演化规律,给出了相互作用绘景中其相应的Schrdinger方程的解析通式,分析了三能级原子、四能级原子分别与双模、三模光场相互作用的演化规律.研究结果表明:当原子初始时刻处于基态时,三能级原子与四能级原子的基态概率幅具有相同的变化规律. 关键词: 多能级原子 多模光场 旋波近似  相似文献   

7.
刘三秋  郭琴  陶向阳  付传鸿 《物理学报》1998,47(9):1481-1488
研究非旋波近似下级联型三能级原子与单模腔场的相互作用.结果表明:非旋波近似下,由于虚光场的影响,辐射场的平均光子数和二阶相干度的演化曲线均出现了“小锯齿状”,表现为系统的量子噪声,随着ω和的增大,量子噪声分别减小和增大;非旋波近似下,系统的反聚束效应较旋波近似的强;研究结果还揭示了平均光子数N(t)和二阶相干度g2(t)与原子-场耦合系数λ的关系. 关键词:  相似文献   

8.
研究表明,在费仑克尔激子的超辐射理论中出现在辐射强度和相干度中的无规颤动是由非旋波作用所引起的。另外,在不考虑非旋波作用项后,超辐射光场是一阶完全相干的,与初始时激子的状态无关。二阶相干度与初始时激子态的二阶相干度相同,不出现更复杂多样的情况。  相似文献   

9.
方细明  冯芒  施磊  高克林  朱熙文 《物理学报》1997,46(11):2160-2165
在相干态表象中精确求解了无旋波近似的Jaynes-Cummings模型,并导出了相应的限制性条件.所求得的解析解与用微扰论求得的近似解比较,当微扰级数取无穷时所得结果一致.本文的方法能方便地推广到三能级系统的讨论. 关键词:  相似文献   

10.
两能级原子与外部环境(热库)相互作用时,采用非旋波近似,研究原子与热辐射场单光子和双光子作用过程,利用小系统与库耦合行为的量子理论,计算原子约化密度矩阵非对角元,分析原子状态的消相干特性。  相似文献   

11.
12.
A new concept of quantitative measure of the amount of structural asymmetry is introduced and defined by maximal overlap between two enantiomers of the same chiral body. This concept is to be called chiral coefficient, and it can readily be extended to physical properties such as mass or electronic wave-function distributions over chiral objects such as molecules or unit cells in crystals. The mathematical aspects of these coefficients are discussed. There exist two cases of maximal overlaps, symmetric and asymmetric, where for the asymmetric case there exist two positions of maximal overlap. It is also shown that there always exists a natural directionz for every asymmetric body for any physical property treated. The possibility of quantizing structural asymmetry is discussed, and, if it exists, it may be associated with the naturalz axis of the chiral system. Possible applications of asymmetry quantification are discussed.  相似文献   

13.
固体手性材料的研制及其特性测试   总被引:10,自引:0,他引:10       下载免费PDF全文
利用溶胶凝胶低温合成非晶态技术,以正硅酸乙酯、γ缩水甘油醚基丙基三甲氧基硅烷和乙醇为前驱体,将手性分子葡萄糖均匀地掺入到上述体系的溶胶与凝胶中,成功地研制出无机固体手性材料样品,并对其光学极化特性、光谱特性及材料的热稳定性进行了测试.测试结果表明,样品的旋光率为-095°cm,计算所得的手征参数为155×10-7. 关键词: 溶胶-凝胶 手性分子 旋光率 手征参数  相似文献   

14.
Chiral organic glass and its infrared spectrum property   总被引:1,自引:0,他引:1       下载免费PDF全文
Chiral molecules griseofulvin were disseminated homogeneously in poly methyl metahcrylate (PMMA) host, which agglomerate from methyl metahcrylate and N, N-dimethyl formamide dimethyl acetal, using benzoyl peroxide as a catalyst. So the chiral organic glass has been manufactured successfully. Its optical rotatory were investigated from a solution state to a solid state. The results of measurement show that the chiral parameter of the chiral organic glass is 2.65×10^{-7} and its specific rotation has increased compared with its solution condition. Its infrared spectra property has been measured by Fourier transformation infrared spectrometer. The results show that the chiral molecules fill in the pore of the network structure in the organic glass, which hardly link with the host.  相似文献   

15.
Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness(left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter(or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically,in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.  相似文献   

16.
Considering the magnetic field response of the QGP medium,we perform a systematical study of the chiral magnetic effect(CME),and make a comparison with the experimental results for the background-subtracted correlator H at the energies of the RHIC Beam Energy Scan(BES)and the LHC energy.The CME signals from our computations show a centrality trend and beam energy dependence that are qualitatively consistent with the experimental measurements of the charge dependent correlations.The time evolution of the chiral electromagnetic current at the RHIC and LHC energies is systematically studied.The dependence of the time-integrated current signal on the beam energy√s with different centralities is investigated.Our phenomenological analysis shows that the time-integrated electromagnetic current is maximal near the collision energy√s≈39 GeV.The qualitative trend of the induced electromagnetic current is in agreement with the CME experimental results at the RHIC and LHC energies.  相似文献   

17.
18.
The effective parameters of chiral composite are studied using a simple model, that is, randomly oriented non-interacting wire helices embedded in a nonchiral host medium. It is found that both the effective permittivity and permeability are independent on the handedness of the chiral objects while the effective chirality admittance is dependent. It is also found that when the ratio of the radius of the chiral helix to its pitch is about 0.23, maximum chirality admittance is achieved. The effective parameters of equichiral sample are also discussed.  相似文献   

19.
李杰  杨方清  董建峰 《物理学报》2011,60(12):124202-124202
提出一种由四重对称的金属线构成的双层平面手征结构,并对两层金属线之间旋转角θ和介质层厚度h进行了优化. 数值模拟结果显示,在一定的θ和h下,该结构在近红外波段具有极强的旋光性和大的手征参数,且在一定的波段范围内具有负折射率. 关键词: 手征介质 旋光性 手征参数 负折射率  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号