均匀外场中的各向异性介质球

得到了均匀外电(磁)场中放入各向异性介质球后全空间电(磁)场分布问题的解.     

Total reflection of waves propagating from an isotropic medium to an anisotropic medium

We examine the value n(i)/n(eff)(theta(t)) , the ratio of the indices of refraction for waves transmitted from an isotropic medium to an anisotropic medium. It is found that total reflection can occur in the case of propagation from a rarer medium to a denser medium.     

Total reflection of light propagating from an isotropic medium to an anisotropic medium

We study the propagation of light from an isotropic medium to an anisotropic medium. It is shown that total reflection can occur only for propagation from a denser medium to a rarer medium; this result does not agree with that of Lin and Wu [Opt. Lett. 23, 22 (1998)].     

Nonuniform quasistatic electric field in a weakly conducting anisotropic medium

The intensity distribution of a nonuniform electric field in a quadrupole electrooptic deflector, the properties of the medium in which are described simultaneously by permittivity and conductivity tensors which are not proportional to each other, is calculated as a function of the phase of the ac control voltage. It is shown that the space charge arising in this case is phase-shifted relative to the control voltage. The computational results are compared with experimental data. Zh. Tekh. Fiz. 67, 51–54 (October 1997)     

均匀外场中介质球壳的场分布

应用轴对称情形下Laplace方程在球坐标系中的通解,根据边值关系,求出了在均匀外场中介质球壳各区域的势函数,讨论了场分布特点,并由此得到了介质球壳的磁屏蔽效果.     

Electromagnetic field of a dipole in an anisotropic medium

The harmonically varying field of point electric and magnetic dipoles in an anisotropic medium with an anisotropic axis is found for the first time.     

Optical diode based on a highly anisotropic layer of a helical periodic medium subjected to a magnetic field

The effect of an applied magnetic field on the optical properties of a layer of a helical periodic medium is studied in view of magnetooptic activity. The case when the radiation is normally incident on the layer and the magnetic field is aligned with the axis of the medium is considered. Irreversibility (nonreciprocity) effects in such a system are discussed. The situations with weak and high anisotropy are investigated. It is shown that the system can function as an optical shutter, optical diode, or one-side reflector. Reasons for the high irreversibility of transmission (reflection) are found.     

Two-dimensional scattering of electromagnetic waves from a permeable inclusion in an anisotropic medium

Integrodifferential equations for the cross section of the scatterer and a collocation method are used to obtain a numerical solution of the problem of scattering of an H-polarized wave by an anisotropic layer of a three-layer dielectric structure. Zh. Tekh. Fiz. 68, 84–88 (January 1998)     

均匀外电场中无限长介质圆柱壳的场分布的计算和讨论

用圆柱坐标系中的分离变量法计算了位于均匀外电场中的无限长介质圆柱壳各区域的电势和电场,由计算结果分析了无限长介质圆柱壳对外电场的屏蔽效果,并指出均匀外电场中的无限长导体圆柱壳、无限长介质圆柱体、无限长导体圆柱及无限大均匀电介质中开有一无限长的圆柱形空腔的电势和电场都可以由均匀电场中的无限长介质圆柱壳电势及电场给出.     

Numerical simulation of an uncharged droplet in a uniform electric field

The deformations of a real dielectric droplet subjected to a uniform alternating electric field and immersed in an insulating fluid are numerically studied by the Boundary Element Method. The alternating electric field time scale is taken much smaller than the hydrodynamic time scale of the droplet shape deformation. The influence of the frequency and the conductivity of the droplet upon the critical electric field, beyond which instabilities develop, are compared with the experimental measurements. Numerical results well account for experimental data while an unexpected good correspondence with Taylor's theory is found.     

Charge grating kinetics in photorefractive crystals subjected to an electric field

The kinetics of charge gratings induced by a standing light wave in a photorefractive crystal in the presence of an electric field is described correctly. It obeys an ordinary differential equation of the fourth order that has two pairs of complex conjugate solutions. A general solution to this equation that satisfies a given initial condition is derived. The field-related mechanism causing charge oscillations and extending the time the gratings take to pass into the steady state is revealed. A relation between these oscillations and space-charge waves is found.     

Electromagnetic field created by a dipole oscillator in an anisotropic medium

General expressions in a covariant form for the fields created by arbitrary oriented electric and magnetic dipole oscillators in an anisotropic medium are obtained. As a simple application, a cold plasma is considered. The near zone and resonance cones are investigated as limit cases.     

Weakly conductive anisotropic media in an alternating electric field

The problem of finding the potential function in a weakly conductive anisotropic medium for an assigned distribution of the potential on the boundary and sinusoidal variation with time is solved. It is shown that for each phase of the supply voltage the distribution of the potential is the same as it would be for a static field in an insulating crystal with a nonuniform anisotropy that varies with the phase according to a definite law. Zh. Tekh. Fiz. 68, 71–74 (April 1998)     

Two-dimensional Wannier-Mott exciton in a uniform electric field

A new treatment of the problem of a two-dimensional Wannier-Mott exciton in a uniform electric field, based on the parabolic coordinates, is presented. The quasi-stationary Hamiltonian is regularized, and the efficient numerical methods are applied. The dependence of the exciton binding energy on the electric field is computed. The results are very close to those obtained by the perturbation theory calculations.     

Decay in presence of a uniform electric field

The decay-rate of an eigenstate into the continuum is calculated in a simple 1-dimensional model, when a small uniform electric field is switched on. It is shown that this rate is very sensitive to changes in the field strength, in conformity with experimental observations.Supported by the Fonds National Suisse.     

Induced emission of electrons moving in a uniform magnetic field and an orthorhombic electric field

It is shown by a quantum-mechanical method that nonrelativistic electrons moving in a uniform magnetic field and an orthorhombic electric field are the source of induced microwave radiation.Translated from IzvestiyaVysshikh Uchebnykh Zavedeaii, Fizika, No. 6, pp. 61–63, June, 1974.In conclusion the authors thank the participants of the seminar led by A. A. Sokolov for useful discussions.     

Reflection and transmission phenomena of waves propagating between an isotropic medium and an arbitrarily oriented anisotropic medium

We theoretically analyze waves propagating between an isotropic medium and an anisotropic medium. Closely examining the boundary condition reveals that the phenomenon of nonsymmetrical reflection occurs when the wave propagates from an anisotropic to an isotropic medium. Calculating the reflection of thin films requires correcting the phase change in each reflected trip in the Airy formula. Analytical results of measurement of the elliptical surface of a wave-vector distribution in an anisotropic medium indicate that reflection and transmission still occur when the reflected and the refracted angles are larger than 90 degrees .