Abstract
Based on the vector diffraction theory, the focusing intensity distribution of TEM01 mode radially polarized Laguerre-Gaussian beams in the focal region is investigated theoretically. By setting the parameters of the complex pupil filter at the pupil plane purposely, a single three-dimensional (3D) optical cage with symmetrical intensity along the z and x axes and the contrast ratio of 0.5 is obtained. Moreover, by optimizing the parameters of pupil filter, multi-three-dimensional optical cages with more excellent quality, such as the contrast ratio of the central optical cage reaching into 0.85, are achieved. In addition, the explanations of how the complex pupil filter affects the focal intensity are also given.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
