Absorption, Scattering, and Thermal Radiation by Conductive Fibers

摘要

The present authors have studied the scattering of electromagnetic waves using variational method. Thus, that the work can be regarded as an extension of the work Tai and Cassedy and Fainberg to include both finite conductivity and arbitrary angel of incidence. Differential scattering patterns are then computed, along with the scattering, absorption and extinction. These cross sections are obtained by intergrating the normal component of the Poynting vector over the surface of the fiber, enabling us to avoid the integration over the far-field sphere usually employed to compute scattering. In addition, it is found that energy considerations are exactly satisfied: the extinction cross section, which by the optical theorem must equal the imaginary part of the forward amplitude, is identically equal to the sum of the absorption and scattering cross sections. This result is particularly valuable for those applications in which we study the scattering and absorption properties of the cloud of such fiber particles.