Cylindrical vector axisymmetric Bessel-modulated Gaussian beam |
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Authors: | Xiumin Gao Qiufang Zhan Jinsong Li Song Hu Jian Wang Songlin Zhuang |
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Affiliation: | (1) Deparment of Electronic Engineering, Jiangxi Polytechnic College, Pingxiang, 337055, China;(2) State Key Lab of Millimeter Waves, Southeast University, Nanjing, 210096, China;(3) School of Science, Quanzhou Normal University, Quanzhou, 362000, China |
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Abstract: | Focusing properties of the cylindrical vector axisymmetric Bessel-modulated Gaussian beam with quadratic radial dependence (QBG beam) in high numerical aperture system is investigated theoretically by vector diffraction theory. Results show that intensity distribution in focal region can be altered considerably by beam parameter μ and polarization angle. Polarization angle may adjust transverse intensity distribution, for instance from one focal spot to one ring shape. While μ alters axial intensity distribution remarkably, focal splitting may occur with tunable focal shift, and real value μ also may induce local intensity minimum. For certain case, with increasing imaginary value μ, transverse focal spot shrinks accompanied with higher full width half maximum of axial intensity distribution. |
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