Open AccessMechanisms of 2π phase control in dielectric metasurface and transmission enhancement effect
Author(s) -
Jing Li,
Tong Wu,
Wenbin Xu,
Yumin Liu,
Chang Liu,
Yu Wang,
Zhongyuan Yu,
Li Yu,
Han Ye
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.023186
Subject(s) - optics , dielectric , resonance (particle physics) , phase (matter) , transmission (telecommunications) , diffraction , wavelength , refractive index , transmission coefficient , phase control , materials science , metamaterial , diffraction efficiency , physics , optoelectronics , computer science , telecommunications , particle physics , quantum mechanics
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.