Focusing of Radially polarized Light Using Gaussian laser beam Near its focal length

Abstract

The Richards-Wolf diffraction model is used to examine focusing of RPGB radially polarized Gaussian beam of low & large numerical aperture. The longitudinally polarized component becomes predominant at high numerical aperture and high radius. Numerical calculations for varied beam characteristics, numerical aperture (NA), and beam radius (θ 0) show the total optical intensity distribution in the focal region. The whole optical intensity distribution in the focal region is illustrated using numerical computations for various beam parameters, numerical aperture (NA), and beam radius (θ 0)The suggested technique appears to produce subwavelength focal spot of o.51λ& significant focal depth of 21λ. Optical trapping, data storage, biomedical imaging, laser cutting, microscopy, and the manipulation of optical traps with high refractive index particles can all benefit from such beams with a small spot size and large focal depth.