Before revision: Methods and applications The use of subwavelength structures to induce low-frequency plasmonic excitations was first theorized by John Pendry et al.
After revision: 250px|Simulation of spoof surface plasmon propagation through a backward-wave metamaterial in the microwave regimeMethods and applications The use of subwavelength structures to induce low-frequency plasmonic excitations was first theorized by John Pendry et al.