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Metamaterials have become widely appreciated for their ability to enable new or difficult material properties, including complex distributions of constitutive parameters. The result is that we have at our disposal an expanded set of tools for controlling the propagation of light. Still, mimicking the intrinsic response of materials is just one function that metamaterials can provide; enhancing nonlinearity and photodynamic processes is another feature that is yet in the early stages of being exploited. By gaining control over the field enhancement associated with metal nanostructures, new classes of quantum metamaterials are possible that not only control wave propagation but also couple strongly to fundamental radiative processes.

metamaterials; plasmonics; nanophotonics