Premium
Achromatic Dielectric Metasurface with Linear Phase Gradient in the Terahertz Domain
Author(s) -
Jia Ridong,
Gao Yufei,
Xu Quan,
Feng Xi,
Wang Qingwei,
Gu Jianqiang,
Tian Zhen,
Ouyang Chunmei,
Han Jiaguang,
Zhang Weili
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202001403
Subject(s) - achromatic lens , terahertz radiation , beam splitter , optics , broadband , materials science , dispersion (optics) , beam (structure) , optoelectronics , phase (matter) , metamaterial , physics , laser , quantum mechanics
The notion of metasurface has inspired the innovation of various functional devices in the terahertz band, but the intrisinc dispersion restricts their application in broadband scenarios. Here, two terahertz achromatic linear‐phase‐gradient metasurface devices are demonstrated, which are a beam deflector and a beam splitter, respectively. The phase and dispersion of the metasurfaces are simultaneously engineered by changing the geometric parameters of the unit cells made of silicon gratings and pillars. The simulated and experimental results demonstrate the achromatic feasibility of the beam deflector from 0.6 to 1.2 THz and of the beam splitter from 0.6 to 1.1 THz. The transmittances and the splitting ratios of the achromatic beam splitter are also analyzed. The metasurface based achromatic beam deflector and splitter presented here not only enrich the terahertz functional devices, but the methods and structures may also promote the research of broadband terahertz metasurfaces.