FOCUSING PROPERTIES OF AZIMUTHALLY POLARIZED LORENTZ GAUSS VORTEX BEAM THROUGH A DIELECTRIC INTERFACE

Abstract

Tight focusing properties of azimuthally polarized Lorentz Gaussian vortex beam through a dielectric interface are numerically studied by vector diffraction theory. The focusing properties, such as spot size, depth of focus, and maximum intensity position, are numerically calculated by properly manipulating the Lorentz parameter with/without annular obstruction values. Thus, using annular obstruction, one can generate a highly confined focal spot of long focal depth when using an azimuthally polarized Lorentz Gaussian vortex beam.