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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
The focusing performance of a radially polarized beams, which are Bessel-Gaussian, Sinh-Gaussian and hollow Gaussian beam, focused by lens with high numerical aperture are investigated based on Debye integral. The maximal intensity shifts from focal spot and the lateral resolution are explored. The effect of parameters of Bessel-Gaussian beam on the achievement of optical needle is also explored. Meanwhile, beam quality and size of focusing spot is achieved for incident sinh-Gaussian beam with large value of parameters. The focusing performance are strongly influenced by the parameters of hollow Gaussian beam and the subwavelength focusing can be achieved by the incident radially polarized hollow Gaussdian beam. Therefore, the proposed radially polarized beams can be applied in focusing lens with high numerical aperture to achieve focusing with super resolution.