Use of motion peculiarities of test particles for estimating degree of coherence of optical fields

Abstract

Abstract. We discuss interconnections between the depth of spatial inhomogeneity of energy distribution of the optical fields and the velocity of motion of test particles for the cases of different light scattering mechanisms during interaction with light. We suggest an additional tool for determining the degree of coherence of superposing waves that propagate along mutually orthogonal directions and have orthogonal polarisations, being linearly polarised in the incidence plane. The use of velocity of the test particles while estimating the degree of coherence of optical fields is suggested for the first time.

Diagnostics of optical fields and media in the framework of the polarization approaches

“…were chosen for investigation [20] (Rayleigh particles). The interaction of these particles with electromagnetic wave is described by dipole approximation and Rayleigh mechanism of light scattering.…”

“…According to the results [20,21], the scattering and absorption components of optical force within Rayleigh approximation can be defined: …”

“…That is why, to make quantitative estimation of coherence degree of optical field and to create model experiment, the particles with the following properties are chosen: absorbing, partially reflecting metal nanoparticles of gold hydrosol of Rayleigh scattering mechanism of size 1 nm [20] …”

“…parameter characterizing the value of energy density for he chosen point m of the optical field and depending on the phase difference between the initial waves in the corresponding point.Then the value of the gradient component of optical force in the scalar form is expressed as[20]:…”

Controlling and manipulation of red blood cells by evanescent waves

“…At present, a set of techniques is available for manipulation of biological objects and microparticles using physical nature tweezers, by transfer of the linear momentum from a photon. Transfer of the linear momentum from light to particles depends on the optical properties of the controlled microparticles and on the phase distribution [7][8][9][10] and polarization [11][12][13] of the probing beam.…”