Dark focal spot shaping of hyperbolic-cosine-Gaussian beam
JOSA B, Vol. 27, Issue 4, pp. 696-702 (2010)
http://dx.doi.org/10.1364/JOSAB.27.000696
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Abstract
Dark focal spot shaping is investigated by vector diffraction theory in the focal region of a hyperbolic-cosine beam that contains one on-axis spiral optical vortex. Results show that a dark focal shape can be altered considerably by the decentered parameters in cosh parts of the beam and topological charge of the vortex. Many novel and interesting dark focal shapes may appear, including rhombic, quadrangular, cross-shaped, and foursquare dark foci. Some dark focal spot chains can also occur. In addition, the numerical aperture of the focusing system can also affect dark focal shapes remarkably, which may lead to dark focal spots that disappear or change focal shape due to the depolarization effect for a high numerical aperture. All of the above dark focal shapes can be used in an optical manipulation system to construct alterable optical traps.
© 2010 Optical Society of America
OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(140.7010) Lasers and laser optics : Laser trapping
(260.1960) Physical optics : Diffraction theory
(050.4865) Diffraction and gratings : Optical vortices
ToC Category:
Lasers and Laser Optics
History
Original Manuscript: August 18, 2009
Revised Manuscript: January 11, 2010
Manuscript Accepted: January 23, 2010
Published: March 15, 2010
Virtual Issues
Vol. 5, Iss. 8 Virtual Journal for Biomedical Optics
Citation
Xiumin Gao, Qiufang Zhan, Jinsong Li, Song Hu, Jian Wang, and Songlin Zhuang, "Dark focal spot shaping of hyperbolic-cosine-Gaussian beam," J. Opt. Soc. Am. B 27, 696-702 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josab-27-4-696
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