基于非周期介电纳米阵列的具有2π相位控制的高效超表面

High-Efficiency Metasurfaces with 2π Phase Control Based on Aperiodic Dielectric Nanoarrays.

作者信息

Shang Sihui, Tang Feng, Ye Xin, Li Qingzhi, Li Hailiang, Wu Jingjun, Wu Yiman, Chen Jun, Zhang Zhihong, Yang Yuanjie, Zheng Wanguo

机构信息

School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.

Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.

出版信息

Nanomaterials (Basel). 2020 Jan 31;10(2):250. doi: 10.3390/nano10020250.

DOI:10.3390/nano10020250

PMID:32023807

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7075171/

Abstract

In this study, the high-efficiency phase control Si metasurfaces are investigated based on aperiodic nanoarrays unlike widely-used period structures, the aperiodicity of which providing additional freedom to improve metasurfaces' performance. Firstly, the phase control mechanism of Huygens nanoblocks is demonstrated, particularly the internal electromagnetic resonances and the manipulation of effective electrical/magnetic polarizabilities. Then, a group of high-transmission Si nanoblocks with 2π phase control is sought by sweeping the geometrical parameters. Finally, several metasurfaces, such as grating and parabolic lens, are numerically realized by the nanostructures with high efficiency. The conversion efficiency of the grating reaches 80%, and the focusing conversion efficiency of the metalens is 99.3%. The results show that the high-efficiency phase control metasurfaces can be realized based on aperiodic nanoarrays, i.e., additional design freedom.

摘要

在本研究中，基于非周期性纳米阵列对高效相位控制硅超表面进行了研究，与广泛使用的周期性结构不同，其非周期性为改善超表面性能提供了额外的自由度。首先，展示了惠更斯纳米块的相位控制机制，特别是内部电磁共振以及有效电/磁极化率的操纵。然后，通过扫描几何参数寻找一组具有2π相位控制的高透射率硅纳米块。最后，通过这些纳米结构数值实现了几种超表面，如光栅和抛物面透镜。光栅的转换效率达到80%，金属透镜的聚焦转换效率为99.3%。结果表明，基于非周期性纳米阵列可以实现高效相位控制超表面，即额外的设计自由度。