The paper briefly presents some essential concepts and features of light fields with strong spatial inhomogeneity amplitude, phase, polarization, other parameters. It contains a characterization optical vortices, speckle fields, polarization singularities. A special attention is paid to the field dynamical characteristics (energy, momentum, angular their derivatives), which are considered not only as mechanical attributes but also its meaningful application-oriented descriptive Peculiar in...

20We describe a novel formulation of light beam propagation through any complex optical system that can be described by an ABCD ray-transfer matrix. Within the paraxial approximation, formulated in terms Huygens principle expressed matrix elements system. We extend and generalize previous treatments to include effects finite-sized limiting apertures (i.e., diffractive screens) train, tilt random jitter elements, distributed inhomogeneities along path (e.g., clear air turbulence aerosols). In...

As an alternative to correlation-based techniques widely used in conventional speckle metrology, we propose a new technique that makes use of phase singularities the complex analytic signal pattern as indicators local displacements. The is generated by vortex filtering pattern. Experimental results are presented demonstrate validity and performance proposed optical metrology with nano-scale resolution.

It is known that internal energy flow in a light beam can be divided into the orbital flow, associated with macroscopic redistribution within beam, and spin originating from instantaneous rotation of field vectors inherent circular or elliptic polarization. In contrast to one, experimental observation constituent seemed problematic because (i) it does not manifest itself visible transformation profile (ii) converts upon tight focusing usually employed for detection by mechanical action on...

We study the self-action of light in a water suspension absorbing subwavelength particles.Due to efficient accumulation energy, this medium shows distinct non-linear properties even at moderate radiation power.In particular, by means interference two obliquely incident beams, it is possible create controllable phase and amplitude gratings whose contrast, spatial temporal parameters depend on beams' coherence power as well geometry.The grating characteristics are investigated via...

A new technique for displacement measurement is proposed that makes use of phase singularities in the complex signal generated by a Laguerre-Gauss filter operation applied to speckle pattern. The core structures are used as unique fingerprints attached object surface, and determined tracing movement registered with their correspondence being identified fingerprints. Experimental results translational rotational measurements presented demonstrate large dynamic range high spatial resolution...

By controlling the irradiance of an extended quasimonochromatic, spatially incoherent source, optical field is generated that exhibits spatial coherence with phase singularities, called vortices. A simple geometry for direct visualization vortices proposed, and local properties evolution vortex are experimentally investigated. To our knowledge, this first quantitative experimental measurement a generic vortex.

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

Non-spherical dielectric microparticles were suspended in a water-filled cell and exposed to coherent Gaussian light beam with controlled state of polarization. When the polarization is linear, particles trapped at certain off-axial position within cross section. After switching right (left) circular polarization, performed spinning motion agreement angular momentum imparted by field, but they involved an orbital rotation around axis as well, which previous works [Y. Zhao et al, Phys. Rev....

Based on the Mie theory and incident beam model via superposition of two plane waves, we analyze numerically momentum flux field scattered by a spherical, nonmagnetic microparticle placed within spatially inhomogeneous circularly polarized paraxial light beam. The asymmetry between forward- backward-scattered fluxes in Rayleigh scattering regime appears due to spin part internal energy flow transverse ponderomotive forces exerted dielectric conducting particles different sizes are calculated...

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

Micrometer-sized vapor-gas bubbles are formed due to local heating of a water suspension containing absorptive pigment particles 100 nm diameter. The is performed by CW near-infrared (980 nm) laser radiation with controllable power, focused into μm spot within 2 mm layer. By changing the four regimes realized: (1) bubble generation; (2) stable growth existing bubbles; (3) stationary existence and (4) bubbles' shrinkage collapse. This behavior interpreted based on temperature conditions....

The absorption parameters of micro-particles have been associated with the induced spin exerted upon particle, when embedded in a circularly polarized coherent field. rotational speed is theoretically analyzed, showing influence beam parameters, particle and tribological surrounding fluid. theoretical findings adequately confirmed experiments.

Water suspension of light-absorbing nano-sized particles is an example a medium in which non-linear effects are present at moderate light intensities favorable for optical treatment organic and biological objects. We study experimentally the phenomena emerging thin layer such under action inhomogeneous field formed due to Pearcey diffraction pattern near microlens focus. In this high-gradient field, energy absorbed by induces distribution refraction index, results observable self-diffraction...

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

Mechanical action caused by the optical forces connected with canonical momentum density associated local wavevector or Belinfante's spin angular is experimentally verified. The helicity-dependent and helicity-independent determined momenta of different nature open attractive prospects for use structures manipulating minute quantities matter importance in nanophysics, nanooptics nanotechnologies, precision chemistry pharmacology numerous other areas. Investigations this area reveal new,...

The paper summarizes the latest obtained results illustrating rectilinear and rotational motion of micro-objects in a biological environment. Such is stipulated by action optical force, on one hand, special influence toque evanescent wave, other one. reason this unusual presence transverse spin component wave. This feature appears due to method excitation: linearly polarized wave with azimuth polarization 45° at total internal reflection (TIR) interface prism medium used. objects study were...

We present the first direct experimental evidence of local properties optical vortices in a random laser speckle field. have observed Berry anisotropy ellipse describing anisotropic squeezing phase lines close to vortex cores and quantitatively verified Dennis angular momentum rule for its phase. Some statistics associated with vortices, such as density, eccentricity, relation zero crossings real imaginary parts field, are also investigated by experiments.

It is shown how an inaccurate alignment of a differential laser anemometer may cause significant broadening the Doppler spectrum. The reason appearance gradients in interference pattern measuring volume. phenomenon was investigated theoretically, and method to measure these presented.

A novel spectrometer concept is analyzed and experimentally verified. The method relies on probing the speckle displacement due to a change in incident wavelength. rough surface illuminated at an oblique angle, peak position of covariance between patterns observed far field with two wavelengths reveals wavelength change. spectral resolution 100 Mhz argued be achievable.

Closed-form expressions are derived for various statistical functions that arise in optical propagation through arbitrary systems can be characterized by a complex ABCD matrix the presence of distributed random inhomogeneities along path. Specifically, within second-order Rytov approximation, explicit general presented mutual coherence function, log-amplitude and phase correlation functions, mean-square irradiance obtained an paraxial system containing Gaussian-shaped limiting apertures....

The feasibilities for optical correlation diagnostics of rough surfaces with large surface inhomogeneities by determining the transformations longitudinal coherence function scattered field are substantiated and implemented.

Experimental interference modelling of the effects colouring a beam traversing light-scattering medium is presented. It shown that result at output depends on magnitudes phase delays singly forward scattered partial signals. The mechanism has for first time experimentally been illustrated propagating through medium. This showed in video-fragments interferograms recorded within zero fringe with gradual change path difference interfering polychromatic wave trains. Spectral investigation...

A random phase plate is prepared by illuminating a photoresist with fully developed speckle field and using the (DPP) as diffuser. Wavefront sensing implemented retrieval based on recording of intensity patterns at various distances from DPP wave propagation equation. The effects roughness height are investigated. From simulations lambda/10 results in that yields good reconstruction for spherical test wavefront incident DPP. experiments different portions received varying exposures examined....