Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

• DOI: 10.1038/lsa.2015.97
• Publication Date: 2015-09-11T07:42:10Z
• Authors: Li-Hua Gao; Qiang Cheng; Jing Yang; Shao-Jie Ma; Jie Zhao; Shuo Liu; Hai-Bing Chen; Qiong He; Wei-Xiang Jiang; Hui-Feng Ma; Qi-Ye Wen; Lan-Ju Liang; Biao-Bing Jin; Wei-Wei Liu; Lei Zhou; Jian-Quan Yao; Pei-Heng Wu; Tie-Jun Cui
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

The terahertz region is a special of the electromagnetic spectrum that incorporates advantages both microwaves and infrared light waves. In past decade, metamaterials with effective medium parameters or gradient phases have been studied to control waves realize functional devices. Here, we present new approach manipulate by using coding metasurfaces are composed digital elements. We propose general unit based on Minkowski closed-loop particle capable generating 1-bit (with two phase states 0 180°), 2-bit four 0, 90°, 180°, 270°), multi-bit elements in frequencies different geometric scales. show strong abilities designing-specific sequences. As an application, demonstrate scattering strategy waves—broadband wide-angle diffusion—using metasurface design verify it numerical simulations experiments. presented method opens route reducing A team China has demonstrated for controlling ‘coding’ attain broadband diffusion. Metamaterials previously used develop Now, Tie Jun Cui co-workers developed one-, two- three-bit loops. They their surfaces showing appropriately designed sequences can be strongly particular, they realized broadband, diffusion two-bit obtained good agreement between measured results simulations. proposed offers way implemented conventional lithography.