Broadband non-polarizing terahertz beam splitters with variable split ratio

Minggui Wei, Quan Xu, Qiu Wang, Xueqian Zhang, Yanfeng Li, Jianqiang Gu, Zhen Tian, Xixiang Zhang, Jiaguang Han, Weili Zhang

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Seeking 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.
Original languageEnglish (US)
Pages (from-to)071101
JournalApplied Physics Letters
Volume111
Issue number7
DOIs
StatePublished - Aug 15 2017

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