Strong optical activity from twisted-cross photonic metamaterials

TitleStrong optical activity from twisted-cross photonic metamaterials
Publication TypeJournal Article
Year of Publication2009
AuthorsDecker M, Ruther M, Kriegler CE, Zhou J, Soukoulis CM, Linden S, Wegener M
Journal TitleOptics Letters
Date Published08/15
ISBN Number0146-9592
Accession NumberISI:000269815400040
Keywordsnegative-index metamaterial, refraction

Following a recent theoretical suggestion and microwave experiments, we fabricate photonic metamaterials composed of pairs of twisted gold crosses using two successive electron-beam-lithography steps and intermediate planarization via a spin-on dielectric. The resulting two effective resonances of the coupled system lie in the 1-2 mu m wavelength regime and exhibit pronounced circular dichroism, while the circular polarization conversion is very small. In between the two resonances, we find a fairly broad spectral regime with strong optical activity, i.e., with a pure rotation of incident linear polarization. The measured optical transmittance spectra agree well with theory. (C) 2009 Optical Society of America

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