Tight focusing properties of phase modulated azimuthally polarized doughnut Gaussian vortex beam by high NA parabolic mirror. (2020)

• Record Type: Journal Article
• Authors: Umamageswari, N.; Lavanya, M.; Udhayakumar, M.; Rajesh, K.B.; Zaroszewicz, Z.
• Is Part Of: Materials today. Volume 26:Part 4(2020)
• Page Start: 3539
• Page End: 3543
• Publication Date: 2020
• Subjects: Azimuthally polarized -- Doughnut Gaussian vortex beam -- Vector diffraction theory -- Multi belt complex phase filter -- High NA parabolic mirror; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2019.07.209
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The 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 microscopy.