title: Partially coherent, radially polarized beam with annular apodization.
abstract: Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ) is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.
authors.affiliation: Department of ECE, National College of Engineering, Tirunelveli, Tamilnadu 627007, India.
authors.forename: C
authors.initials: C
authors.lastname: Mariyal
authors.affiliation: Department of ECE, National College of Engineering, Tirunelveli, Tamilnadu 627007, India.
authors.forename: P
authors.initials: P
authors.lastname: Suresh
authors.affiliation: Department of Physics, Chikkanna Government Arts College, Tirupur, Tamilnadu 641602, India.
authors.forename: K B
authors.initials: KB
authors.lastname: Rajesh
authors.affiliation: Department of Physics, University College of Engineering, Nagercoil, Tamilnadu 629002, India.
authors.forename: T V S
authors.initials: TV
authors.lastname: Pillai
mesh_terms: D008962:Models, Theoretical; D055095:Optics and Photonics