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Radially polarized hyperbolic-cosine-Gaussian beam |
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| Authors: | Xiumin Gao Jian Wang Songlin Zhuang |
| Affiliation: | a Electronics and Information College, Hangzhou Dianzi University, Hangzhou 310018, China b College of Optics and Electronics, University of Shanghai for Science and Technology, Shanghai 200093, China c Key Laboratory of RF Circuit & System, Hangzhou Dianzi University, Ministry of Education, Hangzhou 310018, China |
| Abstract: | Vector beams have attracted much interest recently. In this paper, focusing properties of the radially polarized hyperbolic-cosine-Gaussian beam are investigated. Simulation results show that the focal depth increases with increasing cosine parameter in the cosine term of the beam, while focal spot decreases simultaneously, namely, superresolution occurs. Focal depth increase velocity is quicker for larger cosine parameter, while the transverse focal spot shrinks more quickly for smaller cosine parameter. In addition, for two-portion concentric piecewise radially polarized hyperbolic-cosine-Gaussian beam with π phase shift in center circle portion, focal pattern evolves considerably with increasing cosine parameter, and the evolution principle differs for different radius of the center circle portion. Focal splitting and novel focal spots may appear. This kind of vector beam can be used in optical storage, optical manipulation, and lithography. |
| Keywords: | Radially polarized beam Hyperbolic-cosine-Gaussian beam Focal splitting |
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