期刊
OPTIK
卷 124, 期 7, 页码 650-654出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.ijleo.2011.12.036
关键词
Dark spot; Polarized beam; Phase plate; STED microscope; Optical tweezers
类别
资金
- Qianjiang Talent Project [2011R10010]
- Zhejiang Provincial Natural Science Foundation of China [Y1100408]
- Educational Office of Zhejiang Province [Y201009976]
A dark spot surrounded by light completely, no matter in two-dimensional or three-dimensional, has attracted more and more attention recently, owing to its recommendable applications such as the erase hollow spot for STED fluorescence microscope, the optical trap for cold atoms and the optical tweezers for precise manipulation. The main method to generate a dark spot is beam shaping, by modulating the phase and polarization of the given polarized beam with a proper phase plate. In this paper, most common realization methods for achieving various dark spots with circular polarization beam were summarized and simulated. And several special foci generated with cylindrical polarization beams were first designed, simulated and proposed. The feature and characteristic of dark spots are presented by intensity contour maps. Applications of each dark spot are also discussed according to its characteristic. (c) 2012 Elsevier GmbH. All rights reserved.
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