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      Twisted optical metamaterials for planarized ultrathin broadband circular polarizers.

      1 , ,
      Nature communications
      Springer Science and Business Media LLC

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          Abstract

          Optical metamaterials are usually based on planarized, complex-shaped, resonant nano-inclusions. Three-dimensional geometries may provide a wider set of functionalities, including broadband chirality to manipulate circular polarization at the nanoscale, but their fabrication becomes challenging as their dimensions get smaller. Here we introduce a new paradigm for the realization of optical metamaterials, showing that three-dimensional effects may be obtained without complicated inclusions, but instead by tailoring the relative orientation within the lattice. We apply this concept to realize planarized, broadband bianisotropic metamaterials as stacked nanorod arrays with a tailored rotational twist. Because of the coupling among closely spaced twisted plasmonic metasurfaces, metamaterials realized with conventional lithography may effectively operate as three-dimensional helical structures with broadband bianisotropic optical response. The proposed concept is also shown to relax alignment requirements common in three-dimensional metamaterial designs. The realized sample constitutes an ultrathin, broadband circular polarizer that may be directly integrated within nanophotonic systems.

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          Author and article information

          Journal
          Nat Commun
          Nature communications
          Springer Science and Business Media LLC
          2041-1723
          2041-1723
          May 29 2012
          : 3
          Affiliations
          [1 ] Department of Electrical and Computer Engineering, The University of Texas at Austin, TX 78712, USA.
          Article
          ncomms1877
          10.1038/ncomms1877
          22643897
          9a8752d2-8ddd-460a-935b-b61e684feef7
          History

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