M. P. Gorsky

On polarization metrology (estimation) of the degree of coherence of optical waves

A new approach is proposed for estimating the degree of coherence of optical waves. The possibility of transformation of the spatial polarization distribution in the measured spatial intensity distribution for determining the degree of correlation of superposing waves, linearly polarized in the plane of incidence, is shown.

Investigation of optical currents in coherent and partially coherent vector fields

We present the computer simulation results of the spatial distribution of the Poynting vector and illustrate motion of micro and nanoparticles in spatially inhomogeneously polarized fields. The influence of phase relations and the degree of mutual coherence of superimposing waves in the arrangements of two-wave and four-wave superposition on the characteristics of the microparticles motion has been analyzed. The prospects of studying temporal coherence using the proposed approach are made. For the first time, the possibility of diagnostics of optical currents in liquids caused by polarization characteristics of an optical field alone, using nanoscale metallic particles has been shown experimentally.

Optical correlation algorithm for reconstructing phase skeleton of complex optical fields for solving the phase problem.

We propose an optical correlation algorithm illustrating a new general method for reconstructing the phase skeleton of complex optical fields from the measured two-dimensional intensity distribution. The core of the algorithm consists in locating the saddle points of the intensity distribution and connecting such points into nets by the lines of intensity gradient that are closely associated with the equi-phase lines of the field. This algorithm provides a new partial solution to the inverse problem in optics commonly referred to as the phase problem.

The investigation of the peculiarities of the motion of testing nanoobjects in the inhomogeneously-polarized optical field

The paper proposes for consideration an additional possibility to evaluate the degree of coherence of superposing mutually orthogonal linearly-polarized in the incidence plane waves. When analyzing the behavior of various-type particles (Mie and Rayleigh) in the inhomogeneously polarized optical field and in the inhomogeneous field of the averaged values of the Poynting vector, we obtain an additional tool for defining the degree of coherence of interacting fields. The spatial modulation of polarization in the observation plane shapes the spatial modulation of the energy density volume, which changes the velocity of the particle motion according to the coherence characteristics of the superposing fields and to the resulting optical force that causes the motion and trapping of the tested particles.

Influence of the Brownian movement on the motion of nanoand micro-particles in the inhomogeneous optical field

The motion of light scattering particles of the Mie and Rayleigh micro- and nano-range type in the inhomogeneously-polarized optical field, with allowance made for the Brownian movement, is analysed in the paper. The spatial modulation of polarization in the observation plane determines the spatial modulation of the volume energy density. That is why the velocity and the resulting optical force, which cause the motion of the testing particles, change according to the degree of coherence of the interacting fields. The influence of the forces which arise in the viscous medium and cause the Brownian movement upon the mechanisms of manipulating and trapping testing particles by the optical field is studied.

Phase retrieval of speckle fields based on 2D Hilbert transform

The use of a “window” 2D Hilbert transform for reconstruction of the phase distribution of remote objects is proposed. It is shown that the advantage of this approach consists in the invariance of a phase map to a change of the position of the kernel of transformation and in a possibility to reconstruct the structure-forming elements of the skeleton of an optical field, including singular points and saddle points. We demonstrate the possibility to reconstruct the equi-phase lines within a narrow confidence interval, and introduce a new algorithm for solving the phase problem for random 2D intensity distributions.

The Use of New Approaches to Estimating the Coherence Properties of Mutually Orthogonal Beams

theoretical model for calculating the motion dynamics of the particles of different light-scattering mecha- nisms in the energy inhomogeneous optical field is suggested. The direct relationship between the motion velocity of the tested particles in the created field and the degree of coherence of mutually orthogonal linearly polarized plane waves is demonstrated. The possibilities of using the normalized value of the averaged velocity for particles of the !100 sizes to define the degree of coherence of mutually orthogonal linearly polarized fields are shown.

Search for Methods of Restoring Spatial Phase Distribution of Complex Optical Fields

The paper presents principal approaches to diagnosing the structure forming skeleton of the complex optical field. An optimal approach is chosen, which allow to bring much closer the solution of the phase problem of localization speckle-field special points. This paper deals with the development of these concepts and presents different methods for tackling the problem of diagnosing spatial (coordinate) phase distribution with the help of registered intensity distribution in complex optical fields. The results of the computer simulation of the experi- ment fulfilled within the framework of scalar approximation form the basis of the investigation. The algorithm of solving the phase problem in the approximation of scalar coherent optical fields can be divided into several stages. The first one is to obtain complex amplitude-phase transformations in

Optical currents in coherent and partially coherent vector fields

We present the results of computer simulation of spatial distribution of the Poynting vector and illustrate motion of microparticles in spatially inhomogeneously polarized fields. The influence of phase relations and the degree of mutual coherence of superposing waves in the arrangements of two-wave and four-wave superposition on the characteristics of microparicles motion has been analyzed. The prognosis of prospects of the study of temporal coherence using the proposed approach is made.

The electromagnetic degree of coherence in the near field

New approach is proposed for estimating the degree of coherence of optical waves. The possibility of transformation of spatial polarization distribution in measured intensity distribution for estimating the degree of correlation of superposing vector waves linearly polarized at the incidence plane is shown.