Homogeneous, Axisymmetric and Nonaxisymmetric Particles

In the next example, we show results computed for a perfectly conducting spheroid of size parameter h a = 10, aspect ratio ajh = 2, and Euler angles of rotation Op = / p = 45°. The perfectly conducting spheroid is simulated from the dielectric spheroid by using a very high value of the relative refractive index (rur = l.e- -30), and the version of the code devoted to the analysis of perfectly conducting particles is taken as reference. For this application, the 

TAXSYM routine and the program developed by Bohren [16]. This program was coded by Ute Comberg and is available from www.T-matrix.de. The scattering characteristics are computed in the azimuthal plane y = 0° and for two polarizations of the incident wave. 

While localized sources are used for not extremely aspherical particles, distributed sources are suitable for analyzing particles with extreme geometries, i.e., particles whose shape differs significantly from a sphere. Extremely deformed particles are encountered in various scientific disciplines as for instance 

For the prolate particles considered in our simulations, the sources are distributed on the axis of symmetry as in Fig. 3.12, while for the oblate particles, the sources are distributed in the complex plane as in Fig. 3.13. The wavelength of the incident radiation is A = 0.6328 pm, the relative refractive index 

In Figs. 3.14-3.17 we plot the normalized differential scattering cross-sections together with the results computed with the discrete sources method for parallel and perpendicular polarizations, and for the case of normal incidence. It is apparent that the agreement between the curves is acceptable. 

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Homogeneous, dielectric (isotropic, uniaxial anisotropic, chiral), and perfectly conducting particles with axisymmetric and nonaxisymmetric surfaces... 

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