Key Laboratory of Microelectronics Devices and Integrated Technology, Institute of Microelectronics,Chinese Academy of Sciences, Beijing 100029, China.
Opt Lett. 2010 Jun 1;35(11):1765-7. doi: 10.1364/OL.35.001765.
We extend the work of photon sieves to spiral photon sieves (SPSs) for the generation of a hard-x-ray vortex. A robust digital prolate spheroidal window, which has an optimal energy concentration at low frequencies, was used to adjust the number of pinholes on each ring of the SPS. It was demonstrated that an SPS has better spatial resolution and lower background than a spiral zone plate using the specified smallest structures condition. The intensity at the center of the dark core is difficult to damp to true zero, primarily owing to current limitations of high-aspect-ratio metal nanostructures. The diameter of the dark core increases as the charge value increases. However, the FWHM of the doughnut-shaped ring and background will also increase. Our results pave the way toward the design of high-performance SPSs for the generation of a hard-x-ray vortex.
我们将光子筛的工作扩展到螺旋光子筛 (SPS)，以产生硬 X 射线涡旋。使用具有在低频下最佳能量集中的稳健数字长球窗口来调整 SPS 每个环上的小孔数量。结果表明，在指定的最小结构条件下，SPS 具有比螺旋带板更高的空间分辨率和更低的背景。暗核中心的强度很难降低到真正的零，主要是由于高纵横比金属纳米结构的电流限制。随着电荷量的增加，暗核的直径会增大。然而，环形和背景的半高全宽也会增加。我们的结果为设计用于产生硬 X 射线涡旋的高性能 SPS 铺平了道路。
