Abstract
We extend the concept of spiral zone plates along the optical axis and define a specific single optical element, termed as single-focus spiral zone plates (SFSZPs), for the generation of a single-focus vortex beam. The key idea is to make the transmittance of the spiral zone plates sinusoidal in the azimuthal direction. Furthermore, a two-parameter modified sinusoidal apodization window is introduced to modulate the transmittance function. Theoretical analysis reveals that the third-order diffraction light intensity of the SFSZPs could be reduced by more than three orders of magnitude compared to a conventional spiral zone plate. The experimental results are also presented, confirming the desired single-focus characteristics. The unique single-focus phase singularity properties imply that SFSZPs may find a wide range of imaging and microscopy applications, as well as fundamental studies of vortex beams.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Zhen-Nan Tian, Qi-Dai Chen, Zhi-Yong Hu, Yi-Ke Sun, Yan-Hao Yu, Hong Xia, and Hong-Bo Sun
Opt. Lett. 43(13) 3116-3119 (2018)
Huaping Zang, Yiming Wang, Chenglong Zheng, Weimin Zhou, Lai Wei, Leifeng Cao, and Quanping Fan
Opt. Express 31(19) 30486-30494 (2023)
Ziwen Ji, Huaping Zang, Chunzhen Fan, Junqiao Wang, Chenglong Zheng, Lai Wei, Chuanke Wang, and Leifeng Cao
J. Opt. Soc. Am. A 35(5) 726-731 (2018)