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Published on: August 5, 2016
Fractional spiral zone plates
Lai Wei1, Yulin Gao, Xianlun Wen
1Research Center of Laser Fusion, National Key Laboratory of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang, Sichuan 621900, China.
Summary
We introduce fractional spiral zone plates (FSZPs) to create orientation-selective vortex beams. This new optical element allows for controlled focusing and intensity manipulation, offering novel applications in optics.
Area of Science:
- Optics and Photonics
- Diffractive Optics
- Vortex Beam Generation
Background:
- Classical spiral zone plates (SZPs) are established optical elements for focusing light.
- Controlling the symmetry and properties of focused light beams remains an active area of research.
Purpose of the Study:
- To generalize spiral zone plates (SZPs) to fractional spiral zone plates (FSZPs).
- To investigate the generation of orientation-selective anisotropic vortex foci.
- To explore the control of focal intensity using fractional topological charges.
Main Methods:
- Generalizing the design of spiral zone plates (SZPs) to incorporate fractional topological charges.
- Implementing a binary structure for the fractional spiral zone plates (FSZPs).
- Performing numerical simulations to analyze the focusing properties and intensity distributions.
Main Results:
- Fractional spiral zone plates (FSZPs) can break the symmetry of focusing, producing orientation-selective anisotropic vortex foci.
- The binary structure of FSZPs leads to additional high-order foci along the optical axis.
- The intensity of these foci can be precisely controlled by selecting the fractional topological charge.
Conclusions:
- Fractional spiral zone plates (FSZPs) offer a novel method for controlling light focusing.
- The ability to tune focal intensity and create anisotropic vortex beams has significant implications for optical applications.
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