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Spirally polarized axisymmetric Bessel-modulated Gaussian beam |
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| Authors: | Xiumin Gao Qiufang Zhan Jian Wang |
| Affiliation: | a Electronics & Information College, Hangzhou Dianzi University, Hangzhou 310018, China b China Standard Software Co., Ltd, Shanghai 200030, China c College of Optics & Electronics, China Jiliang University, Hangzhou 310018, China d University of Shanghai for Science and Technology, Shanghai 200093, China |
| Abstract: | Focusing properties of the spirally polarized axisymmetric Bessel-modulated Gaussian beam with quadratic radial dependence (QBG beam) are investigated theoretically by vector diffraction theory. Calculation results show that intensity distribution in focal region can be altered considerably by beam parameter μ and spiral parameter C that indicates polarization spiral degree. For certain real value μ, focal spot can evolve from one focal spot to one focal ring, spherical crust focal shape, then two focal rings on increasing spiral parameter C. It was found that under condition of different μ, evolution principle of focal pattern differs very remarkably on increasing C. And some novel focal shapes may appear, including rhombic shape, quadrangular shape, two-spherical crust focus shape, two-peak shape, one dark hollow focus, two dark hollow focuses pattern, triangle dark hollow focus. |
| Keywords: | Focusing properties Axisymmetric Bessel-modulated Gaussian beam Vector diffraction theory |
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