Vol. 22, issue 04, article # 2

Shapovalov K. A. Light scattering of arbitrary oriented cylinder in Wentzel - Kramers - Brillouin approximation. 2. Š•fficiency factors of extinction and absorption. // Optika Atmosfery i Okeana. 2009. V. 22. No. 04. P. 321-324 [in Russian].
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The expressions for calculation of extinction and absorption efficiency factors by optically "soft" ( m - 1 << 1, where m = n + iχ is a relative refractive index of cylinder) circular finite cylinder for arbitrary polarized incident light in the direction at any angle to the axis of cylinder in Wentzel - Kramers - Brillouin (WKB) approximation are obtained. It is shown analytically that the expressions of extinction efficiency factor by homogeneous particle of any shape in WKB in scalar form and anomalous diffraction (AD) approximations are coincided to an accuracy of χ. It is noted that only under significant optical "softness" of particle (|m – 1| → 0) the expression for the efficiency factor of absorption by homogeneous particle of any shape in WKB approximation in scalar form also goes into such expression for AD approximation.


factor of attenuation and absorption efficiency; light scattering; polarization; homogeneous particle