Scattering of a zero-order bessel beam by a plasma anisotropic sphere

Based on the generalized Lorenz-Mie theory (GLMT) and the Fourier transform method, the scattering of a plasma anisotropic spherical particle illuminated by a zero-order Bessel beam (ZOBB) are studied. Both the on-axis and off-axis incident cases is considered. Using the vector wave theory, the expansion coefficients of the incident ZOBB in terms of the spherical vector wave functions (SVWFs) are obtained. According to the orthogonality of the associated Legendre function and exponential function, concise expressions of the expansion coefficients for the on-axis and off-axis incident ZOBB are derived, and the expressions can effectively reconstruct the ZOBB with all conical angles. The differences of scattering characteristics of a plasma anisotropic sphere illuminated by an on-axis and off-axis ZOBB are exhibited. Influences of the conical angle, particle size, off-axis distance and anisotropic parameters on the angle distributions of the radar cross section (RCS) are analyzed in detail. The unique internal and near field distributions of a plasma anisotropic spherical particle illuminated by an on-axis and off-axis ZOBB are demonstrated. The results provide insights into the scattering and wave-matter interactions and may find important applications in optical propagation and optical micromanipulation of biological and anisotropic complex particles, microwave engineering and target shielding.