Dynamically tunable terahertz passband filter based on metamaterials integrated with a graphene middle layer

Yang MaoSheng^{1, 2, 4}, Liang LanJu^{1, 2, 3, †}, Wei DeQuan^{1, 4, ‡}, Zhang Zhang^{1, 2, 3, 4}, Yan Xin^{1, 2, 3, 4}, Wang Meng^{1, 4}, Yao JianQuan^{1, 3, 4}

(color online) Illustration of a metamaterial with graphene and the structural design. (a) Schematic illustration of the periodic arrangement of the unit cell. (b) Bottom structure design of the metamaterial. (c) Structural design of an individual unit cell.