Abstract
We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μm-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Delin Jia, Yuan Tian, Wei Ma, Xiaofeng Gong, Jiayi Yu, Guozhong Zhao, and Xiaomei Yu
Opt. Lett. 42(21) 4494-4497 (2017)
Quanlong Yang, Jianqiang Gu, Dongyang Wang, Xueqian Zhang, Zhen Tian, Chunmei Ouyang, Ranjan Singh, Jiaguang Han, and Weili Zhang
Opt. Express 22(21) 25931-25939 (2014)
Zhaoxian Su, Kun Song, Jianbo Yin, and Xiaopeng Zhao
Opt. Lett. 42(12) 2366-2369 (2017)