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Twisted optical metamaterials for planarized ultrathin broadband circular polarizers

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Listed:
  • Y. Zhao

    (The University of Texas at Austin)

  • M.A. Belkin

    (The University of Texas at Austin)

  • A. Alù

    (The University of Texas at Austin)

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.

Suggested Citation

  • Y. Zhao & M.A. Belkin & A. Alù, 2012. "Twisted optical metamaterials for planarized ultrathin broadband circular polarizers," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1877
    DOI: 10.1038/ncomms1877
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    Cited by:

    1. Ufuk Kilic & Matthew Hilfiker & Shawn Wimer & Alexander Ruder & Eva Schubert & Mathias Schubert & Christos Argyropoulos, 2024. "Controlling the broadband enhanced light chirality with L-shaped dielectric metamaterials," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Jacques Doumani & Minhan Lou & Oliver Dewey & Nina Hong & Jichao Fan & Andrey Baydin & Keshav Zahn & Yohei Yomogida & Kazuhiro Yanagi & Matteo Pasquali & Riichiro Saito & Junichiro Kono & Weilu Gao, 2023. "Engineering chirality at wafer scale with ordered carbon nanotube architectures," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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