Opt Lett. 2018 Jul 1;43(13):3116-3119. doi: 10.1364/OL.43.003116.
In this Letter, we report mirror-rotation-symmetrical single-focus spiral zone plates (MS-SZPs) fabricated by femtosecond laser direct writing. The novel optical element can generate a single-focus vortex beam, owing to the element's complicated continuous surface. The MS-SZP surface possesses reverse mirror-rotation symmetry, which ensures that the transfer element has the same surface morphology as the original element. Both the transfer element and original element have good optical properties. The single-focus behavior was investigated by a microscopic imaging system and found to be in good agreement with theoretical simulation results. The innovative optical component is expected to be widely used in optical communication, quantum computation, optical manipulation, and other fields.
在这封信中，我们报告了通过飞秒激光直写制造的具有镜像旋转对称的单聚焦螺旋偏光镜（MS-SZP）。由于元件的复杂连续表面，这种新型光学元件可以产生单聚焦涡旋光束。MS-SZP 表面具有反向镜像旋转对称性，这确保了传输元件具有与原始元件相同的表面形态。传输元件和原始元件都具有良好的光学性能。通过显微镜成像系统研究了单聚焦行为，发现其与理论模拟结果吻合良好。这种创新的光学元件有望在光通信、量子计算、光学操纵等领域得到广泛应用。
