Article ID Journal Published Year Pages File Type
7130500 Optics & Laser Technology 2014 5 Pages PDF
Abstract
A radially polarized doughnut Gaussian beam is first introduced to generate a subwavelength focal spot. The focusing characteristics of a radially polarized doughnut Gaussian beam by a lens with high numerical aperture are investigated based on the Richards-Wolf diffraction integral formulae. Numerical results indicate that a sub-wavelength focusing can be obtained for a radially polarized doughnut Gaussian incident beam. Therefore, the radially polarized doughnut Gaussian beam is of great importance in the super-resolution focusing area.
Related Topics
Physical Sciences and Engineering Engineering Electrical and Electronic Engineering
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