Based on the principle of antenna pattern multiplication as the product of the element pattern and array factor, a simple and flexible method to generate hollow-tube arrays with predetermined properties is proposed. This approach can be easily realized in a 4Pi focusing system by reversing the field eradiated from the collinear antenna array whose elements are isotropic magnetic current sources. All hollow tubes produced by this method are pure azimuthally polarized fields whose intensity distribution is nearly unchanged along the entire depth of focus. Numerical results show that the appearance and position of the focusing field only depend on the element pattern and array factor, respectively. These peculiar focusing field arrays are suitable for multi-particle trapping and manipulation, materials processing, and optical lithography.
Based on binary optical ideas, the beam shapers are designed for producing pseudo-Bessel beams at THz. In order to
analyze precisely the properties of pseudo-Bessel beams generated by the designed shapers, a rigorous electromagnetic
calculation method is employed. This is to associate a two-dimensional finite-difference time-domain (2-D FDTD)
method, for determining the fields diffracted by the beam shapers in the near region, with Stratton-Chu formula (SCF),
for compute the fields in the far region. The numerical results and conclusions are given in our paper.
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