Polarisation indication of the movement of particles in a dispersion medium,caused by light pressure

摘要

Absorption of light by a dispersion medium as well as its reflection and refraction at the boundary are accompanied by the appearance of mechanical forces acting on the particles as a light pressure.The light pressure was measured experimentally for the first time by P.N.Lebedev more than hundred years ago in exceptionally fine experiments.When laser sources of powerful light radiation appeared,the fields on investigation and use of light pressure widened substantially (see,for example,Afanas'ev & Katarkevich,Rubinov,Efendiev,2002).In recent years,investigations of light pressure concerned very different fields from astrophysics for explanation the effect of rotation of cosmic dust particles to biology for manipulation by individual cells.Despite the tempting perspectives of application,the theory of light pressure and movement of-particles of a medium under its action in the conditions of multiple scattered light in the medium was practically not developed till now.This is explained by the complexity of the process of interaction of light radiation with an individual particle and the limited possibilities of the radiative transfer theory which gives analytical solutions only for case of coarse idealisations.The main difficulty that is considered as insuperable in analytical solving the problem is,as known,the necessity of taking into account an infinitely large number of terms when the scattering indicatrix is expanded in terms of orthogonal functions.