Flexible film with paired cut wires for a uniquely high FOM above 300

Wireless communication in the terahertz waveband is progressing by synthesizing unique compounds including man-made metamaterials. However, it has still not been fully shown how metamaterials can be the basis for structures with a high refractive index and no reflection or how they could lead to potential metadevices. Here we achieve a uniquely high potential of figure of merit (FOM=Re(n)/Im(n)) above 300 at 0.29 THz by a flexible film structure consisting simply of cut wires. The results here offer a way ahead for many applications with on-demand electromagnetic properties.