摘要
Optical vortices generated by the conventional vortex lens are usually disturbed by the undesired higher-order foci,which may lead to additional artifacts and thus degrade the contrast sensitivity. In this work, we propose an efficient methodology to combine the merit of elliptical reflective zone plates(ERZPs) and the advantage of spiral zone plates(SZPs) in establishing a specific single optical element, termed elliptical reflective annulus quadrangle-element coded spiral zone plates(ERAQSZPs) to generate single-focus phase singularity. Differing from the abrupt reflectance of the ERZPs, a series of randomly distributed nanometer apertures are adopted to realize the sinusoidal reflectance. Typically, according to our physical design, the ERAQSZPs are fabricated on a bulk substrate;therefore, the new idea can significantly reduce the difficulty in the fabrication process. Based on the Kirchhoff diffraction theory and convolution theorem, the focusing performance of ERAQSZPs is calculated. The results reveal that apart from the capability of generating optical vortices,ERAQSZPs can also integrate the function of focusing, energy selection, higher-order foci elimination, as well as high spectral resolution together. In addition, the focusing properties can be further improved by appropriately adjusting the parameters, such as zone number and the size of the consisted primitives. These findings are expected to direct a new direction toward improving the performance of optical capture, x-ray fluorescence spectra, and forbidden transition.
作者
臧华平
王宝珍
郑程龙
魏来
范全平
王少义
杨祖华
周维民
曹磊峰
郭海中
Huaping Zang;Baozhen Wang;Chenglong Zheng;Lai Wei;Quanping Fan;Shaoyi Wang;Zuhua Yang;Weimin Zhou;Leifeng Cao;Haizhong Guo(Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China;National Key Laboratory for Laser Fusion,Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China;School of Engineering Physics,Shenzhen Technology University,Shenzhen 518118,China)
基金
Project supported by the National Natural Science Foundation of China (Grant Nos.12174350,12275253,and 12275250)
the Program of Science and Technology on Plasma Physics Laboratory,China Academy of Engineering Physics (Grant No.6142A04200107)
the National Natural Science Foundation,Youth Fund (Grant No.12105268)。
