Decker, ManuelLinden, StefanWegener, Martin2016-04-262016-04-260146-9592http://hdl.handle.net/1885/101111We introduce a particular low-symmetry (point group of unit cell C1) planar periodic arrangement of magnetic split-ring resonators that acts as an effective optical wave plate. We show that this behavior specifically results from the in-plane interactions among the individual split-ring resonators. Measured normal-incidence transmittance and conversion spectra of gold-based samples fabricated via electron-beam lithography show fundamental resonances at around 235 THz frequency (1275 nm wavelength) that are in good agreement with theory.The project PHOME acknowledges the financial support of the Future and Emerging Technologies (FET) program within the Seventh Framework Programme for Research of the European Commission, under FETOpen grant 213390. We also acknowledge support of the Deutsche Forschungsgemeinschaft (DFG) and the State of Baden-Württemberg through the DFGCenter for Functional Nanostructures (CFN) within subproject A 1.5 and funding through the METAMAT project by the Bundesministerium für Bildung und Forschung (BMBF). The research of S. Linden is further supported through Helmholtz-HochschulNachwuchsgruppe (grant VH-NG-232) and the Ph.D. education of M. Decker by the Karlsruhe School of Optics and Photonics (KSOP).3 pages© 2009 Optical Society of Americalow-symmetryplanarperiodicmagneticsplit-ringresonatorsopticalwaveplate2009-05-1510.1364/OL.34.001579