Vol. 20, issue 04, article # 3

Shapovalov K.A. Light scattering by a finite-length cylinder in Wentzel-Kramers-Brillouin approximation. 2. Efficiency factors of extinction and absorption. // Atmospheric and oceanic optics. 2007. V. 20. No. 04. P. 284-286.
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The formulas for calculation of the efficiency factors of extinction and absorption by optically "soft" (|m - 1| << 1, where m = n - iχ is a relative refractive index of the cylinder) circular cylinder of a finite length for incident light direction perpendicular to the axis of cylinder in Wentzel-Kramers-Brillouin (WKB) approximation are obtained. It is shown analytically and numerically that the values of factor efficiency extinction by circular cylinder in WKB and anomalous diffraction (AD) approximations fully coincide. It is noted that unlike extinction efficiency factor only under significant optical "softness" of the circular cylinder (|m - 1| → 0) the expression for efficiency factor of absorption by circular cylinder in WKB approximation passes into such expression in AD approximation.