Balčytis A, Hakobyan D, Gabalis M, Žukauskas A, Urbonas D, Malinauskas M, Petruškevičius R, Brasselet E, Juodkazis S
Opt Express. 2016 Jul 25;24(15):16988-98. doi: 10.1364/OE.24.016988.
Tailoring the spatial degree of freedom of light is an essential step towards the realization of advanced optical manipulation tools. A topical challenge consists of device miniaturization for improved performance and enhanced functionality at the micron scale. We demonstrate a novel approach that combines the additive three-dimensional (3D) structuring capability of laser polymerization and the subtractive subwavelength resolution patterning of focused ion beam lithography. As a case in point hybrid (dielectric/metallic) micro-optical elements that deliver a well-defined topological shaping of light are produced. Here we report on hybrid 3D binary spiral zone plates with unit and double topological charge. Their optical performances are compared to corresponding 2D counterparts both numerically and experimentally. Cooperative refractive capabilities without compromising topological beam shaping are shown. Realization of advanced designs where the dielectric architecture itself is endowed with singular properties is also discussed.
调整光的空间自由度是实现先进光学操控工具的关键一步。一个热门挑战是在微米尺度上进行器件小型化，以提高性能和增强功能。我们展示了一种新颖的方法，该方法将激光聚合的三维（3D）增材结构化能力与聚焦离子束光刻的亚波长分辨率减法图案化相结合。作为一个例子，制造出了能实现明确光拓扑整形的混合（介电/金属）微光学元件。在此，我们报告具有单位和双拓扑电荷的混合3D二元螺旋波带片。通过数值模拟和实验将它们的光学性能与相应的二维对应物进行了比较。展示了在不影响拓扑光束整形的情况下的协同折射能力。还讨论了介电结构本身具有奇异特性的先进设计的实现。
