Design of DOE for generating a needle of a strong longitudinally polarized field
Optics Letters, Vol. 35, Issue 7, pp. 965-967 (2010)
http://dx.doi.org/10.1364/OL.35.000965
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Abstract
A needle of strong longitudinally polarized field with homogeneous intensity along the optical axis, long depth of focus, and subdiffraction beam size can be generated by focusing a radially polarized light with a high-NA lens and a diffractive optical element (DOE) with belts. A method combining the global-search-optimization algorithm and the tight focusing properties of the radially polarized light is proposed to design the DOE. Based on the tight focusing properties, the light incident on the lens is divided into two parts: areas A and B. We discover that the longitudinal field in the focal region is mainly dependent on the number of belts in area B but not the total number of belts in the DOE.
© 2010 Optical Society of America
OCIS Codes
(110.2990) Imaging systems : Image formation theory
(140.3300) Lasers and laser optics : Laser beam shaping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(180.0180) Microscopy : Microscopy
(260.5430) Physical optics : Polarization
ToC Category:
Microscopy
History
Original Manuscript: November 6, 2009
Revised Manuscript: January 18, 2010
Manuscript Accepted: February 9, 2010
Published: March 24, 2010
Virtual Issues
Vol. 5, Iss. 8 Virtual Journal for Biomedical Optics
Citation
Kun Huang, Peng Shi, Xue-liang Kang, Xiaobo Zhang, and Yong-ping Li, "Design of DOE for generating a needle of a strong longitudinally polarized field," Opt. Lett. 35, 965-967 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-7-965
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