Abstract
The focusing properties of a cylindrically polarized higher-order Generalized Spiraling Bessel beam (GSBB) by a high numerical aperture lens system are investigated based on the Richards and Wolf vectorial diffraction method. The intensity distribution of a cylindrically polarized higher-order GSBB at the focal region is derived and its properties are discussed numerically. It is found that the focused beam can have a multi-ringed dark hollow profile and a flat-top profile. The central dark spot, multi-ringed structure, peak intensity, and flat-topped focus size can be controlled by adjusting the polarization angle, the topological charge, the axicon base angle \(\gamma\), and the beam order. Focusing properties of the higher-order GSBB may find applications in laser scanning microscopy, micro-particle manipulation, and optical data storage.
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El Halba, E.M., Hricha, Z. & Belafhal, A. Focus shaping of cylindrically polarized higher-order generalized spiraling Bessel beams. Opt Quant Electron 55, 994 (2023). https://doi.org/10.1007/s11082-023-05220-x
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DOI: https://doi.org/10.1007/s11082-023-05220-x