Continuous terahertz omnidirectional beam steering by dual diffraction of metagratings  

作　　者：JIE-RONG CHENG YANG YANG SAI CHEN QI-YE WEN YUN-YUN JI FEI FAN SHENG-JIANG CHANG 

机构地区：[1]Institute of Modern Optics,Nankai University,Tianjin 300350,China [2]Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology,Tianjin 300350,China [3]School of Electronic and Information Engineering,Beihang University,Beijing 100191,China [4]State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China [5]Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China

出　　处：《Photonics Research》2023年第1期44-54,共11页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2017YFA0701000);National Natural Science Foundation of China(61831012,62005140,62175118)。

摘　　要：Dynamic beam steering with unlimited angular range and fast speed remains a challenge in the terahertz gap,which is urgently needed for next-generation target tracking,wireless communications,and imaging applications.Different from metasurface phased arrays with element-level phase control,here we steer the beam by globally engineering the diffraction of two cascaded metagratings during in-plane rotation.Benefiting from large-angle diffraction and flexible on/off control of the diffraction channels,a pair of metagratings with optimized supercells and proper orientation successfully directs the incoming beam towards any arbitrary direction over the transmission half space,with the steering speed improved more than twice that of the small-angle diffractive designs.Single-beam and dual-beam steering within the solid angle of 1.56πand elevation angle of±77°has been demonstrated with average throughput efficiency of 41.4%at 0.14 THz,which can be generalized to multiple-beam cases.The dual diffraction engineering scheme offers a clear physical picture for beamforming and greatly simplifies the device structure,with additional merits of large aperture and low power consumption.

关 键 词：BEAM directional globally 

分 类 号：O43[机械工程—光学工程]