The length scale of a metamaterials' features should be complementary to the length scale the metamaterial is acting on.
Kind of squirrely, and I tried really hard to phrase that so it isn't a tautology. But if you're dealing with radio waves, your metamaterial can have huge (meter-scale) features. If you're dealing with visible light, your feature size is on the hundreds of nanometer scale.
Kind of squirrely, and I tried really hard to phrase that so it isn't a tautology. But if you're dealing with radio waves, your metamaterial can have huge (meter-scale) features. If you're dealing with visible light, your feature size is on the hundreds of nanometer scale.
Thin films have a characteristic bending length: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.11..., and this determines the size of features you should pattern to exploit that bending/folding interaction.