Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Volume 30, Issue 2, Pages 233-237Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAA.30.000233
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Funding
- Foundation of the CAEP [2011B0102022, 2011B0102021, 2009A0102003]
- National Natural Science Foundation of China [10905051]
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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. (C) 2013 Optical Society of America
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