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Open AccessArticle

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

1
School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
2
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
3
Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
*
Authors to whom correspondence should be addressed.
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These authors contribute equally to this article.
Nanomaterials 2020, 10(2), 250; https://doi.org/10.3390/nano10020250
Received: 17 December 2019 / Revised: 23 January 2020 / Accepted: 27 January 2020 / Published: 31 January 2020
(This article belongs to the Section Nanophotonics: Characterization, Modelling, and Nanodevices)
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. View Full-Text
Keywords: metasuface; Huygens; granting; metalens; phase control metasuface; Huygens; granting; metalens; phase control
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MDPI and ACS Style

Shang, S.; Tang, F.; Ye, X.; Li, Q.; Li, H.; Wu, J.; Wu, Y.; Chen, J.; Zhang, Z.; Yang, Y.; Zheng, W. High-Efficiency Metasurfaces with 2π Phase Control Based on Aperiodic Dielectric Nanoarrays. Nanomaterials 2020, 10, 250.

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