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EXTINCTION AND ABSORPTION EFFICIENCY FACTORS OF A FINITE-LENGTH CYLINDER IN THE DISCRETE DIPOLE AND WENTZEL- KRAMERS-BRILLOUIN APPROXIMATIONS

The values of light scattering extinction and absorption efficiency factors of an optically “soft” ( 1 1 << − m , where χ i n m + = is the relative refractive index of the cylinder) finite-length circular cylinder irradiated by linear polarized light in the direction at any angle to the cylinder symmetry axis are compared in the WentzelKramers-Brillouin (WKB) approximation and in the Discrete Dipole Approximation (DDA). The amended expressions of light scattering extinction and absorption efficiency factors in the WKB approximation for an optically “soft” finite-length circular cylinder are presented. The differences between parallel and perpendicular polarizations of light scattering extinction and absorption efficiency factors for a finitelength circular cylinder are calculated in the WKB approximation and in the DDA. As a result of the minimal error of comparison of light scattering extinction and absorption efficiency factors in the WKB approximation and in the DDA is equal about 10%. The correctness of the new revised formulas for light scattering extinction and absorption efficiency in the WKB approximation of a finite-length circular cylinder in the vector form is validated numerically.