Second-harmonic generation from complementary split-ring resonators

The Arizona–Marburg work is supported by the DFG, the Air Force Office of Scientific Research, and a senior Humboldt award (J. V. M.). The project PHOME acknowledges the financial support of the Future and Emerging Technologies (FET) programme within the Seventh Framework Programme for Research of the European Commission, under FET-Open grant 213390. The project METAMAT is supported by the Bundesministerium fur Bildung und Forschung (BMBF).