Generation and tight-focusing properties of cylindrical vector circular Airy beams |
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| Authors: | Fei Wang Chengliang Zhao Yuan Dong Yiming Dong Yangjian Cai |
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| Institution: | 1. School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China
2. Department of Physics, Shaoxing University, Shaoxing, 312000, China
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| Abstract: | Tight-focusing properties of cylindrical vector circular Airy beams i.e., azimuthally polarized (AP) circular Airy beam and radially polarized (RP) circular Airy beam] passing through a high numerical aperture thin lens are investigated in detail. It is found that a super long subwavelength dark channel with full width at half maximum about 0.49λ and depth of focus (DOF) about 52λ can be achieved near the focal region for the case of tight focusing of an AP circular Airy beam, and a super long needle with DOF about 27.5λ of strong longitudinally polarized field can be obtained near the focal region for the case of tight focusing of a RP circular Airy beam. Furthermore, we report experimental generation of an AP circular Airy. Our results will be useful for atom guiding and trapping, particle acceleration and fluorescent imaging. |
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