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.
© 2012 OSA
J. K. Gansel, M. Latzel, A. Frölich, J. Kaschke, M. Thiel, and M. Wegener, "Tapered Gold Helices as High-Extinction-Ratio, Broadband Circular Polarizer," in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (Optical Society of America, 2012), paper QM2E.4.
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