光学
电介质
共振(粒子物理)
相(物质)
传输(电信)
衍射
波长
折射率
透射系数
相位控制
材料科学
超材料
衍射效率
物理
光电子学
计算机科学
电信
粒子物理学
量子力学
作者
Jing Li,Tiesheng Wu,Wenbin Xu,Yumin Liu,Chang Liu,Yu Wang,Zhongyuan Yu,Li Yu,Han Ye
出处
期刊:Optics Express
[The Optical Society]
日期:2019-08-05
卷期号:27 (16): 23186-23186
被引量:14
摘要
Metasurfaces, two-dimensional structures composed of nanoantennas in an array configuration, can be used to fully control electromagnetic waves, which requires a 2π phase shift. Herein, we apply the silicon metasurface as an example to interpret the mechanisms of full 2π phase coverage. It is found that the mechanism varies from Fabry-Pérot resonance to Mie resonance as the period increases for a metasurface with certain height. Particularly, there is a transition region between these two types of resonance. We present the corresponding periods and wavelength regions of the different mechanisms when considering the phase-gradient metasurface with at most three diffraction orders. Moreover, the transmission enhancement of metasurface is investigated. The transmission efficiency can be effectively improved when the nanoantenna is changed from a uniform structure to a gradient-index one. We expect that the results can simplify the design process and provide a reference for the future design of all-dielectric metasurface with 2π phase control.
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