Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202001403
Keywords
achromatic terahertz devices; dielectric metasurfaces; linear phase gradient
Categories
Funding
- National Natural Science Foundation of China [61975143, 61307125, 61420106006, 61422509, 61575141, 61622505, 62005193]
- China Postdoctoral Science Foundation [2020TQ0224]
- National Science Foundation [ECCS-1232081]
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This study demonstrates two terahertz achromatic linear-phase-gradient metasurface devices, showing achromatic behavior from 0.6 to 1.2 THz for a beam deflector and from 0.6 to 1.1 THz for a beam splitter. The research enriches terahertz functional devices and may promote further research in broadband terahertz metasurfaces.
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.
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