Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3693181
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- Deutsche Forschungsgemeinschaft (DFG)
- State of Baden-Wurttemberg
- Karlsruhe Institute of Technology (KIT) via DFG Center for Functional Nanostructures (CFN) [A1.5]
- Bundesministerium fur Bildung und Forschung (BMBF)
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We have previously shown that square arrays of three-dimensional gold helices can serve as compact broadband circular polarizers. Here, we show by heuristic reasoning supported by numerical calculations that the bandwidth of the device can realistically be increased to 1.5 octaves by tapering the gold-helix radius. The tapering also improves the extinction ratio. Depending on the side from which light impinges onto the tapered helices, the polarization conversions are different. Therefore, the structure is either optimal as polarizer or as analyzer. Corresponding structures for the infrared spectral range are fabricated by direct laser writing and gold electroplating. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3693181]
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