Broadband non-polarizing terahertz beam splitters with variable split ratio
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractSeeking effective terahertz functional devices has always aroused extensive attention. Of particular interest is the terahertz beam splitter. Here, we have proposed, designed, manufactured, and tested a broadband non-polarizing terahertz beam splitter with a variable split ratio based on an all-dielectric metasurface. The metasurface was created by patterning a dielectric surface of the N-step phase gradient and etching to a few hundred micrometers. The conversion efficiency as high as 81% under the normal incidence at 0.7 THz was achieved. Meanwhile, such a splitter works well over a broad frequency range. The split ratio of the proposed design can be continuously tuned by simply shifting the metasurface, and the angle of emergences can also be easily adjusted by choosing the step of phase gradients. The proposed design is non-polarizing, and its performance is kept under different polarizations.
CitationWei M, Xu Q, Wang Q, Zhang X, Li Y, et al. (2017) Broadband non-polarizing terahertz beam splitters with variable split ratio. Applied Physics Letters 111: 071101. Available: http://dx.doi.org/10.1063/1.4986538.
SponsorsThis work was supported by the National Key Basic Research Program of China (Grant No. 2014CB339800), the National Science Foundation of China (Grant Nos. 61422509, 61420106006, and 61427814), and the U.S. National Science Foundation (Grant No. ECCS-1232081).
JournalApplied Physics Letters