Abstract
Based on the vector diffraction theory, the focusing intensity distribution of TEM01 mode radially polarized Laguerre-Gaussian beams in the focal region is investigated theoretically. By setting the parameters of the complex pupil filter at the pupil plane purposely, a single three-dimensional (3D) optical cage with symmetrical intensity along the z and x axes and the contrast ratio of 0.5 is obtained. Moreover, by optimizing the parameters of pupil filter, multi-three-dimensional optical cages with more excellent quality, such as the contrast ratio of the central optical cage reaching into 0.85, are achieved. In addition, the explanations of how the complex pupil filter affects the focal intensity are also given.
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Acknowledgement
This work was supported by the National Basic Research Program of China (2011CB707504), the National Natural Science Foundation of China (60807007), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (201033), the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (121010), and the Shanghai Leading Academic Discipline Project (S30502).
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Guo, H., Weng, X., Dong, X. et al. Three dimensional optical cage formed by TEM01 mode radially polarized Laguerre-Gaussian beam. J Opt 40, 206–212 (2011). https://doi.org/10.1007/s12596-011-0055-8
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DOI: https://doi.org/10.1007/s12596-011-0055-8