摘要
In this work,we designed and studied a feasible dual-layer binary metagrating,which can realize cotrollable asymetrie transmission and beam splitting with nearly perfect performance.Owing to ingenious geometry configuration,only one meta-atom is required to design for the metagrating system.By simply controlling air gap between dual-layer metagratings,high-eficiency beam splitting can be well switched from asymmetrie tranmission to sy mmetric tranmission.The working principle lies on gap-induced dffraction channel transition for ineident waves from opposite direetions.The asymmetric/symmetric transmission can work in a certain frequency band and a wide incident range.Compared with previous methods using acoustie metasurfaces,our approuch has the advantages of simple design and tumnable property and shows promise for applications in wavefront manipulation,noise control and one-way propagation.
基金
the National Natural Science Foundation of China(Grant Nos.11904169,11974010,61675095,and 11604229)
the Natural Science Foundation of Jiangsu Province(Grant Nos.BK 20190383 and BK20171206).
