Spherically polarized vector Bessel vortex beams

A different type of Bessel-like vortex beams with their intensity spherically modified by a singular polarization structure is introduced. Conventional vector Bessel-Gaussian beams are either linearly or radially (and azimuthally) polarized and their transverse structure is preserved under propagation. In this work, the Bessel-like beams with a Gaussian envelope are spherically polarized: the electric fields are oriented along the radius vector or along with a combination of meridional and azimuthal vectors. For the implementation of such beams, we investigate their vector spatial spectra. The intensity distribution of the beam can be controlled by a proper choice of parameters such as the cone angles of individual plane-wave components and sizes of Gaussian apertures. In the two limiting cases of axicon angles, spherically polarized Bessel beams form either two optical needles or optical-bottle-like intensity patterns.