Mechanisms of 2π phase control in dielectric metasurface and transmission enhancement effect.
Clicks: 154
ID: 66616
2019
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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li2019mechanismsoptics
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| Authors | Li, Jing;Wu, Tiesheng;Xu, Wenbin;Liu, Yumin;Liu, Chang;Wang, Yu;Yu, Zhongyuan;Zhu, Danfeng;Yu, Li;Ye, Han; |
| Journal | Optics express |
| Year | 2019 |
| DOI | 10.1364/OE.27.023186 |
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