Structured beams carrying orbital angular momentum (OAM) provide powerful capabilities for applications in optical tweezers, super-resolution imaging, quantum optics, and ad-vanced microparticle manipulation. However, it is challenging for generate and control the OAM beams at the extreme ultraviolet (EUV) region due to the lack of suitable wave front shaping optics arise from being limited to the strong absorption of most materials. Here, we use a modified Fermat-spiral photon-sieve splitter to simultaneously generate two focused doughnut beams with opposite helical phase. Our technique enables us to produce splitting focused vortex beams with different rotation directions at EUV wavelengths. Additionally, we provide experimental evidence showcasing the capabilities of our method and further detect the helical phase by self-reference interferometry. This work not only opens a route for OAM-driven applications in EUV radiation, but also paves the way to studies of holographic technique by EUV splitter.

中文翻译：

---

使用改进的费马螺旋光子筛分束器的极紫外涡旋双聚焦


携带轨道角动量 (OAM) 的结构化光束为光镊、超分辨率成像、量子光学和先进微粒操纵等应用提供了强大的功能。然而，由于受限于大多数材料的强吸收而缺乏合适的波前整形光学器件，在极紫外（EUV）区域产生和控制OAM光束具有挑战性。在这里，我们使用改进的费马螺旋光子筛分束器来同时生成两个具有相反螺旋相位的聚焦环形光束。我们的技术使我们能够在 EUV 波长下产生具有不同旋转方向的分裂聚焦涡旋光束。此外，我们提供了实验证据，展示了我们的方法的能力，并通过自参考干涉测量进一步检测螺旋相位。这项工作不仅为OAM驱动的EUV辐射应用开辟了一条途径，而且为EUV分束器全息技术的研究铺平了道路。