Guo Zhongyi, Zhu Lie, Guo Kai, Shen Fei, Yin Zhiping
School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei, 230009, China.
Nanoscale Res Lett. 2017 Aug 29;12(1):512. doi: 10.1186/s11671-017-2279-2.
In this paper, a high-order dielectric metasurface based on silicon nanobrick array is proposed and investigated. By controlling the length and width of the nanobricks, the metasurfaces could supply two different incremental transmission phases for the X-linear-polarized (XLP) and Y-linear-polarized (YLP) light with extremely high efficiency over 88%. Based on the designed metasurface, two polarization beam splitters working in high-order diffraction modes have been designed successfully, which demonstrated a high transmitted efficiency. In addition, we have also designed two vortex-beam generators working in high-order diffraction modes to create vortex beams with the topological charges of 2 and 3. The employment of dielectric metasurfaces operating in high-order diffraction modes could pave the way for a variety of new ultra-efficient optical devices.
本文提出并研究了一种基于硅纳米砖阵列的高阶介电超表面。通过控制纳米砖的长度和宽度，该超表面能够以超过88%的极高效率为X线偏振（XLP）光和Y线偏振（YLP）光提供两种不同的增量传输相位。基于所设计的超表面，成功设计了两种工作在高阶衍射模式下的偏振分束器，其具有较高的传输效率。此外，我们还设计了两种工作在高阶衍射模式下的涡旋光束发生器，以产生拓扑电荷数为2和3的涡旋光束。采用工作在高阶衍射模式下的介电超表面可为各种新型超高效光学器件的发展铺平道路。
