应用光学, 2019, 40 (2): 306, 网络出版: 2019-03-26
基于超表面材料的扇出衍射光学元件
Metasurface fan-out diffractive optical elements
超表面材料 几何相位 扇出衍射光学元件 相位调控 metasurfaces geometric phase fan-out diffractive optical elements phase manipulation
摘要
提出一种基于电介质纳米砖阵列的扇出衍射光学元件的设计和实现方案, 其纳米砖的深宽比低至1.5。这种扇出衍射光学元件被一束波长为633 nm的入射光束照射时, 可以在远场中得到均匀的4×4点阵, 发散角为32°×32°, 且数值模拟与实验结果吻合良好。基于超表面材料的扇出衍射光学元件具有连续、精确的相位操纵能力和较高的偏振转换效率, 并且仅需一步光刻制造工艺, 可以广泛应用于工程光学的各种领域, 例如光学传感, 激光雷达, 激光加工等。
Abstract
Here we report the design and realization of dielectric fan-out diffractive optical elements (DOEs) operating in visible range and with nanobrick depth-width-ratio as low as 1.5. The metasurface-based fan-out DOEs realized here, when illuminated by an incident beam with 633 nm wavelength , the uniform 4×4 spot arrays with an extending angle of 32°×32° can be obtained in the far field. Experimental results agree well with the theoretical analysis and numerical simulation conclusions. Because of these advantages of the single-step nonstructural fabrication procedures, continuous and accurate phase manipulation, and strong polarization conversion,the metasurface-based fan-out DOEs could be utilized for various applications such as optical sensing, lidar, laser machining and so on.
陈奎先, 王宇, 何桃桃, 崔圆, 陶金, 李子乐, 郑国兴. 基于超表面材料的扇出衍射光学元件[J]. 应用光学, 2019, 40(2): 306. CHEN Kuixian, WANG Yu, HE Taotao, CUI Yuan, TAO Jin, LI Zile, ZHENG Guoxing. Metasurface fan-out diffractive optical elements[J]. Journal of Applied Optics, 2019, 40(2): 306.