Photonic and acoustic topological insulators exhibiting one-way transportation that is robust against defects and impurities are typically realized in coupled arrays of two-dimensional ring resonators.These systems ha...Photonic and acoustic topological insulators exhibiting one-way transportation that is robust against defects and impurities are typically realized in coupled arrays of two-dimensional ring resonators.These systems have produced a series of applications,including optical isolators,delay lines,and lasers.However,the structures are complicated because an additional coupler ring between neighboring rings is needed to construct photonic pseudospin.A photonic anomalous Floquet topological insulator is proposed and experimentally demonstrated in the microwave regime.This improved design takes advantage of the efficient and backward coupling of negative-index media.The results contribute to the understanding of topological structures in metamaterials and point toward a unique direction for constructing useful topological photonic devices.展开更多
基金the financial support from the National Key R&D Program of China(Grant No.2021YFA1400602)the National Natural Science Foundation of China(Grant Nos.12004284,11974261,91850206,and 61621001)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.22120210579)the Shanghai Chenguang Plan(Grant No.21CGA22).
文摘Photonic and acoustic topological insulators exhibiting one-way transportation that is robust against defects and impurities are typically realized in coupled arrays of two-dimensional ring resonators.These systems have produced a series of applications,including optical isolators,delay lines,and lasers.However,the structures are complicated because an additional coupler ring between neighboring rings is needed to construct photonic pseudospin.A photonic anomalous Floquet topological insulator is proposed and experimentally demonstrated in the microwave regime.This improved design takes advantage of the efficient and backward coupling of negative-index media.The results contribute to the understanding of topological structures in metamaterials and point toward a unique direction for constructing useful topological photonic devices.
