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Polarization conversion of metal-helix based metamaterials can be eliminated by recovering four-fold rotational symmetry. Symmetry considerations and current progress in the fabrication of N-helix optical metamaterials as broadband circular polarizers is presented.
Tapering is shown to further extend the bandwidth of three-dimensional gold-helix metamaterials as broadband circular polarizers to about 1.5 octaves. Furthermore, the extinction ratio is improved. Theory and experiment show good agreement.
Chirale Strukturen sind in der Natur allgegenwärtig. Optisch äußert sich Chiralität durch eine Drehung der linearen Polarisation des Lichts. Bei den meisten natürlichen Substanzen sind diese Drehungen allerdings sehr klein, da die Wellenlänge des Lichts um ein Vielfaches größer ist als die chiralen Bauelemente. Die heutige Nanotechnologie erlaubt es, chirale Strukturen auf der Skala der Wellenlänge...
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