Umamageswari NLavanya MUdhayakumar MRajesh K BZaroszewicz Z2020-09-282020-09-282019-08-102214-7853https://www.sciencedirect.com/science/article/pii/S2214785319323478https://dspace.psgrkcw.com/handle/123456789/1825The intensity distribution in the focal region of a high NA parabolic mirror for the incident azimuthally polarized doughnut Gaussian vortex beam (DGVB) transmitted through a multi belt complex phase filter (MBCF) is studied using vector diffraction theory. By properly designing the phase of the incident beam using MBCF and by tuning the beam parameters of a DGVB, it is possible to switch the focal spot with sub wavelength dimension and long focal depth in to multiple focal spots suitable for particle acceleration, atom optical experiments, and near-field scanning optical microscopyenAzimuthally polarizedDoughnut Gaussian vortex beamVector diffraction theoryMulti belt complex phase filterHigh NA parabolic mirrorArticle