Electrically controlled transfer of spin angular momentum of light in an optically active medium

Spin is an intrinsic property of the photon. A method for using an externally applied dc electric field to manipulate the transfer of spin angular momentum of light in an optically active medium is presented. To discuss this, we first develop a wave coupling theory of the mutual action of natural optical activity and the linear electro-optic effect. Besides being used for analyzing the electrically controlled transfer of spin angular momentum of light, the theory can also be used to describe the propagation of light traveling along an arbitrary direction in any optically active medium with an external dc electric field along an arbitrary direction.     

The evolution of polarization in an inhomogeneous birefringert,optically active medium

This note presents a method giving the change of polarization of an e.m. wave propagating in an inhomogeneous medium which is birefringent and optically active. The method has proved useful in a problem where the medium is a plasma with a magnetic field: it can be applied to other cases of interest, e.g. liquid crystals, as is here briefly discussed.     

Slow light deflection in Gaussian pumped atomic medium

We present the moments formalism theory to study the deflection of the slow signal light in the cold atomic media, which is under the condition of the Gaussian control laser and electromagnetically induced transparency. Deflection, the interesting phenomenon on quantum coherence, is testified by analytic and numerical methods. Results show that, as the signal light propagating in the medium, there would be an observable deflection before the general diffraction. Influences of the coupling intensity on deflection phenomenon and the beam waist of the signal light in the medium are also investigated.     

Experimental method to detect chiral asymmetry in specular light scattering from a naturally optically active medium

An experimental method is described for measuring chiral asymmetries in specular light scattering from a naturally optically active medium with a sensitivity on the order of one part in 10⁶. The chiral asymmetries of interest are the differential reflection of left and right circularly polarised light (circular differential reflection) and the deviation from mutual orthogonality of reflected transverse electric and transverse magnetic polarised light (skewness). The measurement of these chiral asymmetries would permit one to test the recently predicted Fresnel amplitudes for reflection from isotropic optically active transparent and absorving media and thereby to resolved controversial fundamental issues concerning the electrodynamics of chiral media.     

光由光密介质射向光疏介质时半波损失的条件

本文通过对反射波和入射波振幅的比值关系进行详细解析推导、作图呈现和分析讨论,给出反射光和入射光相位差在折射率-入射角空间的详细分布图,并指明半波损失发生的各种条件,其中包括光由光密介质射向光疏介质时反射光发生半波损失的条件.研究表明当光束由光密介质射向光疏介质时反射波也可能发生半波损失,而当光束由光疏介质射向光密介质时反射波也不是一定会发生半波损失.澄清和补充了一些现有教科书中不很明确的结论.     

Circular electrodichroism of light in isotropic optically active media

Circular electrodichroism is predicted in liquids and gases containing unequal concentrations of mirror stereoisomers of chiral molecules. A longitudinal (quasi)static electric field increases absorption for a light wave circularly polarized in one direction and decreases the absorption for a wave circularly polarized in the opposite direction. The corresponding nonlinear susceptibility is proportional to the decay constants of the excited states and is absent in a nondissipative medium. Estimates of the magnitude of the effect are presented and show that it may well be observable experimentally. Pis’ma Zh. éksp. Teor. Fiz. 66, No. 8, 515–520 (25 October 1997)     

Simulation of light propagation in anisotropic,optically active and slightly inhomogeneous medium,concerning the acousto-optic interaction

A novel modeling technique is introduced for modeling light propagation in slightly inhomogeneous, anisotropic and optically active materials. With the aid of the model the phenomenon of acousto-optic interaction can be efficiently and accurately simulated in a completely general approach. The applied inhomogeneity caused by the sound waves can be arbitrary, similarly the incident and propagating light beams can be also arbitrary, nonparaxial. The basis of the model is described in our previous paper, in addition present work introduces further improvements. The calculation speed is significantly enhanced by increasing the speed of convergence in the case of large spatial frequency ranges and arbitrary angles between the acoustic and optical waves. We also extend our model to handle optical activity, which considerably influences the acousto-optic effect in widely used materials, like TeO2.Mathematical confirmation of the calculated field convergence to the exact solution of the Maxwell's equations is included. The simulation precisely describes the acousto-optic interaction, as a physical verification, simulation results satisfy accurately principal theoretical expectations i.e. diffracted light intensity, phase and polarization distribution.     

Propagation of ultrashort light pulses in an active medium without the SVA and RW approximation

We investigate the propagation of ultrashort light pulses in an inverted medium without the SVA and the RW approximation. We find a steady-state pulse solution of the equations, which is a generalization of the well-known sech-pulse solution. This new solution enables us to estimate the range of validity of these approximations and yields new structural insight.     

Generation of phase-correlated light pulses in a hyper-Raman active medium

We analysis within the quantum setting the effect of correlation of monochromatic fields of the Stokes and parametric radiation generated in a two-photon-absorbing medium by hyper-Raman scattering and four-wave mixing, respectively. Our results show that when there is destructive interference between the two processes, both modes are amplified in the medium in a correlated way, so that beyond a certain characteristic distance they propagate in a stationary manner with the same amplitudes and photon statistics but with opposite phases, while the medium becomes transparent to them. We calculate the intensity of the fields, the emission linewidths, and the diffusion of the total phase, the latter determining the extent of phase noise correlation at the output. We also show that no matter how the phases of the separate modes diffuse, the quantum fluctuations in the total phase may be completely squeezed. Zh. éksp. Teor. Fiz. 111, 1942–1954 (June 1997)     

Identification and characterization of optically active materials excited by sources in the chiral medium

Biological and chemical materials that possess chiral properties can be identified and characterized through their optical activity. Optical activity (Optical Rotation and Circular Dichroism) manifests itself through the measurement of select elements of the Mueller matrix that are proportional to the cross polarized reflection and transmission coefficients for waves that are incident in free space upon the optically active medium. Thus no polar decomposition is required to identify optical activity. Thus it is not necessary to measure all sixteen elements of the Mueller Matrix. We analyze here in detail the case when the exciting sources lie below the interface in the chiral material, which could be a fluid. Explicit expressions, to within first order of the chiral measure, are obtained for the corresponding reflection and transmission matrices for circularly and linearly polarized waves. These results are compared with the results for excitations above the interface in free space. Significant differences are found between the corresponding expressions for the reflection and transmission matrices, they are related to the Mueller matrix elements and the Differential Circular Reflection. These results have numerous biological, biochemical, and medical applications.     

Neutrino processes in an external active medium

Possible manifestations of the interaction of neutrinos with an active external astrophysical medium (dense plasma and strong magnetic field) owing both to the nonstandard magnetic moment of the Dirac neutrino appearing in extensions of the Standard Model and to the standard weak interaction have been analyzed.