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Fractional spiral zone plates |
JOSA A, Vol. 30, Issue 2, pp. 233-237 (2013)
http://dx.doi.org/10.1364/JOSAA.30.000233
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Abstract
In this paper, we generalize the concept of classical spiral zone plates (SZPs) to fractional spiral zone plates (FSZPs). By using an SZP with a fractional topological charge and controlling the starting orientation, we can break down the symmetry of the focusing process to give orientation-selective anisotropic vortex foci. Numerical results show that its binary structure gives additional high-order foci on the optical axis and the intensities in the foci can be controlled by properly choosing the fractional topological charge. Our study reveals the feasibility to control the intensity in the foci by means of FSZPs.
© 2013 Optical Society of America
OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1940) Diffraction and gratings : Diffraction
(050.1970) Diffraction and gratings : Diffractive optics
(050.1965) Diffraction and gratings : Diffractive lenses
ToC Category:
Diffraction and Gratings
History
Original Manuscript: November 2, 2012
Revised Manuscript: January 8, 2013
Manuscript Accepted: January 8, 2013
Published: January 30, 2013
Citation
Lai Wei, Yulin Gao, Xianlun Wen, Zongqing Zhao, Leifeng Cao, and Yuqiu Gu, "Fractional spiral zone plates," J. Opt. Soc. Am. A 30, 233-237 (2013)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-2-233
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