双曲色散型单轴左手介质中的折射

研究了横磁波在各向同性右手介质和双曲色散型单轴左手介质界面处波矢和能流的折射。计算发现,当入射角在很大范围内变化时,波矢的折射角和能流的折射角几乎不变。调节光轴角可使波矢折射角和能流折射角随入射角变化不敏感的现象更明显,经分析计算给出光轴角的调节范围。这一现象是由双曲色散型单轴左手介质的各向异性及负的主折射率引起的,可以用来实现光束准直、光束整合、光束压缩以及方便的光束耦合。如果光从双曲色散型单轴左手介质向各向同性右手介质入射,还能实现超棱镜(superprism)现象。计算了横磁波穿越界面时的透过率,证实双曲色散型单轴左手介质可能实现上述应用。     

基于马赫-曾德干涉法测量原子介质的色散特性

理论分析了利用马赫-曾德干涉仪及平衡零拍探测技术测量相干介质色散特性的方法,实验测量了三能级铯原子分别在电磁诱导透明和电磁诱导吸收两种截然相反的相干效应下的色散特性.研究表明:在原子频率共振中心,对于透明介质,由于吸收减弱效应,信号光能穿出介质,保证了有效色散信息,即正常色散特性能被测量到;相反地,对于吸收介质,由于强吸收效应,只有在低粒子数密度条件下,即保证有信号光没有被完全吸收而穿出介质,才能测量到介质的反常色散特性;当提高铯泡温度时,介质对信号光吸收增强以至完全吸收,并且吸收频谱宽度变宽,导致色散信息不能被有效测量到.     

色散吸收一维光学系统中光场量子起伏的功率谱

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。     

色散吸收非对称介质光腔中光场的量子理论

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.     

线性色散理论描述内腔EIT介质的正交模式分裂

正交模分裂(或真空Rabi分裂)是原子与光学腔构成的复合系统实现强相互作用的一个典型现象.本文理论研究了三能级原子介质与腔构成的复合系统,利用线性色散理论将腔内三能级原子自感应透明(EIT)介质的吸收和色散引入光学腔透射公式,非常直观清晰得到腔透射谱的三个分裂峰,它是由腔内EIT介质的吸收和色散特性使一个共振腔模分裂为三个腔模.该方法可以推广到腔内含有任意色散和吸收的介质.     

等离子体加载色散吸收对称介质光腔的量子理论

利用色散吸收介质中电磁场的正则量子化方法，研究等离子体加载对色散吸收介质光腔系统量子性质的影响。结果表明，介质加载使系统真空场起伏功率谐的空间分布发生明显变化。     

关于介质吸收与色散的振子特性参数

根据共振模型，讨论影响介质的吸收与色散的振子特性参数，得到关于振子阻尼系数的振子数的解析式。据此，利用介质的吸收谱曲线可以定量计算振子的阻尼系数和振子数，这对研究和改善介质的吸收和色散特性有重要意义。我们已用此方法研究气液浓度的光电特性。     

运动介质电动力学和(包含色散项的)牵引效应

在文献[1]中,我们曾用Maxwell-Minkowski电磁理论得到了电磁波在运动介质中的波动方程,讨论了电磁波在无色散透明介质中的传播问题,用所得结果解释了无色散牵引实验。此外,对于介质界面是平面、介质运动速度在其界面内的情况,反射波的频率总是等于入射波的频率(这一结论,许多作者在以前也     

等离子体 / 色散吸收介质界面系统中光场量子起伏功率谱

利用格林函数方法量子化色散吸收介质中的电磁场，研究了等离子体/色散吸收介质系统光场的量子性质.理论和数值计算表明，系统的工作状态与所选光场频率密切相关，等离子体介质的阻尼性明显地影响自身区域电场量子起伏功率谱，并且对另一侧介质中电场量子起伏功率谱的变化有连带作用.     

金属和Kerr非线性介质界面上表面等离子体激元的色散关系

从麦克斯韦方程组出发,结合边界条件,分别得到TM波和TE波在金属和Kerr非线性介质界面上表面等离子体激元的色散关系.由于非线性的存在,TM波的色散关系变得复杂,与光强、非线性系数有关.和线性情况一样,此界面不存在TE波.     

Deeply penetrating waves in lossy media

The incidence of an inhomogeneous plane wave on the interface between two lossy media is analyzed. The analytical expressions of the incidence angle of the phase vector, for which the transmitted wave has the phase or the attenuation vector parallel to the interface, are obtained. The transmitted wave with the attenuation vector parallel to the interface is physically interpreted, finding a wave in a lossy medium without attenuation away from the interface. The same effect appears at the interface between a lossless medium and a lossy one.     

Reflection and transmission of waves in pyroelectric and piezoelectric materials

The reflection and transmission theories of waves in pyroelectric and piezoelectric medium are studied in this paper. In general in an infinite homogeneous pyroelectric medium there are four bulk wave modes: quasi-longitudinal, two quasi-transversal and temperature waves. In an infinite homogeneous piezoelectric medium there are three bulk wave modes: quasi-longitudinal and two quasi-transversal waves. In the reflection and transmission problem there are five complex boundary conditions in the pyroelectric medium and four complex boundary conditions for the piezoelectric medium. In this paper, we find that the surface waves will be revealed in the reflection and transmission wave problem. The surface waves have the same wave vector component with the incident waves on the interface plane. The two dimensional reflection problem of waves at the interface between the semi-infinite pyroelectric medium and vacuum is researched in greater detail and a numerical example is given.     

旋光媒质中光波传播的物理光学理论

由麦克斯韦电磁理论,结合旋光媒质的本构关系,研究旋光媒质中光波的传播,给出均匀媒质中光波的色散关系、媒质界面上光波的反射和折射规律以及旋光性的结果.     

Reflection and transmission of plane waves at the interface of pyroelectric bi-materials

A simple reflection and transmission theory of plane waves at the interface of pyroelectric media is studied in this paper. In an infinite homogeneous pyroelectric medium, there are four bulk wave modes: quasi-longitudinal (QL), two quasi-transversal (QT) and one temperature (T) waves, whose velocities depend on the frequency and incident angle. Simultaneously, a quasi-surface (QS) wave on each side of the interface of pyroelectric bi-materials will appear in the general reflection and transmission problem. The quasi-surface wave has the same wave vector component with the incident waves along the interface plane. So, the reflection and transmission problem is different with the propagation wave in the infinite homogeneous space, but it is still solvable. In the reflection and transmission problem, there are ten complex continuous conditions on the interface, which are satisfied by the bulk and quasi-surface waves together. Numerical calculations are performed for bi-material PZT-6B/BaTiO₃. Incidences of the quasi-longitudinal and quasi-transversal waves from the side of PZT-6B or BaTiO₃ medium are discussed. The reflection and transmission amplitude coefficients and energy flow ratios varying with the incident angle are examined.     

Deformation Features on the Free Surface and Rigid Interface during Elastic Wave Reflection

Analytical expressions defining the reflection coefficients have been derived in the framework of the known problem of elastic wave reflection from the free surface and rigid interface. The found reflection coefficients are used to analyze the dependences of different strain and rotation components during elastic wave reflection from the free surface and rigid interface in the case of ideal contact and possible slip on the wave incidence angle and elastic parameters of the medium. Deformation features of elastic media at the studied interfaces are considered for incident longitudinal and transverse waves.     

导电介质中电磁波相移常数与振幅衰减常数的方向关系的讨论

对文献上给出的非均匀电磁波在同一均匀导电介质中传播时,电磁波的相移常数和振幅衰减常数方向之间满足定量关系的结论,重新进行了分析和推导,利用电磁波在导电介质界面的边界条件,给出了两种情况下的相移常数和振幅衰减常数的表达式,以及它们与界面法线的夹角正弦的表达式.结果表明,在同一均匀导电介质中,非均匀电磁波的相移常数的方向和振幅衰减常数的方向之间一般不满足定量关系.     

Generation and propagation of undamped temperature waves under pulse action on a target surface

The physical mechanism of undamped temperature waves and the conditions of generation thereof in media with a finite time of local thermal relaxation are examined. The wave frequency depends on the relaxation time and the parameters of the pulse action on a medium, and the lowest frequencies correspond, in particular, to air. These effects can be used to identify and investigate this action. It is demonstrated that the character of wave reflection from the interface between different media depends on the state and the finish quality of the given surface. In particular, in the ideal case of a sharp interface between air and metal, temperature waves are totally reflected at the interface. On the contrary, if there is a “blurred” interface, reflections can be almost completely suppressed and waves not absorbed in air penetrate into another medium and are rapidly attenuated in it. Other combinations of media can also lead to an analogous phenomenon, which makes it possible to develop remote heating systems by which distant environments are warmed without thermal energy losses in the intermediate medium.     

Surface-plasmon wave at the planar interface of a metal film and a structurally chiral medium

The solution of a boundary-value problem formulated for a modified Kretschmann configuration shows that a surface-plasmon wave can be excited at the planar interface of a sufficiently thin metal film and a nondissipative structurally chiral medium, provided the exciting plane wave is p-polarized. An estimate of the wavenumber of the surface-plasmon wave also emerges thereby.     

Control of direction of Goos–Hänchen shift on reflection from a weakly absorbing medium

The Goos–Hänchen effect of reflected beams at the interface between isotropic medium and weakly absorbing medium was studied. We find that there is a lateral shift when a light beam travels through the interface for reflected beam for TM wave. The influence of permeability and permittivity on the Goos–Hänchen shift was discussed, respectively. When the weakly absorbing medium is right-handed material the imaginary of magnetic permeability will control the direction and magnitude of the shift. On the contrary, when the weakly absorbing medium is left-handed material, the refractive index of the isotropic medium determines the direction and magnitude of the shift.