Abstract
Based on orthogonality of associated Legendre functions and trigonometric functions, the radiation torque exerted on a uniaxial anisotropic sphere located in a linearly and circularly polarized Gaussian beam with arbitrary propagation direction is obtained. The radiation torque exerted on a uniaxial anisotropic sphere with different permittivity and permeability tensor elements illuminated by a linearly polarized Gaussian beam is calculated. The effects of the position of beam center, incident angle, polarization angle of the Gaussian beam, absorption, anisotropy ratio and size parameter on the three components of the radiation torque are numerically discussed in detail. The incident Gaussian beam can be a linear or a circular polarization. Some comparisons between these characteristics and those on an isotropic sphere are given.
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