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  1. Uniaxial-isotropic Metamaterials by Three-Dimensional Split-Ring Resonators

    Che-Chin Chen, Atsushi Ishikawa, Yu-Hsiang Tang, Ming-Hua Shiao, Din Ping Tsai and Takuo Tanaka

    Article first published online: 24 OCT 2014 | DOI: 10.1002/adom.201400316

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    A uniaxial-isotropic IR metamaterial consisting of fourfold-symmetric 3D split-ring resonators (SRRs) formed by a metal stress-driven self-folding method is fabricated and characterized. Unambiguous isotropic characteristics are demonstrated for any lateral rotation, polarization, and incident angle up to 40°. The corresponding numerical simulations reveal that the interplay of electric and magnetic interactions of the 3D SRR plays a crucial role in the bi-anisotropic responses.

  2. Finely Tuned Blue Iridium Complexes with Varying Horizontal Emission Dipole Ratios and Quantum Yields for Phosphorescent Organic Light-Emitting Diodes

    Jeong-Hwan Lee, Ganguri Sarada, Chang-Ki Moon, Woosum Cho, Kwon-Hyeon Kim, Young Geun Park, Jin Yong Lee, Sung-Ho Jin and Jang-Joo Kim

    Article first published online: 22 OCT 2014 | DOI: 10.1002/adom.201400350

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    Blue-emitting heteroleptic Ir(III) complexes with a high horizontal ratio of emitting dipoles (θ) and photoluminescence quatum yields (ΦPL) are synthesized and the effect of the substituents in the Ir–complexes on θ and ΦPL is investigated. The control of θ and ΦPL of Ir–complex results in an efficient phosphorescent organic light-emitting diode with an external quantum efficiency over 20% at 1000 cd m–2.

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    Directional Coupling: Symmetry-Broken Metamaterial Absorbers as Reflectionless Directional Couplers for Surface Plasmon Polaritons in the Visible Range (Advanced Optical Materials 10/2014) (page 956)

    Fan Ye, Michael J. Burns and Michael J. Naughton

    Article first published online: 18 OCT 2014 | DOI: 10.1002/adom.201470063

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    High efficiency (reflectionless) conversion from free propagating photons to bound surface plasmon polaritons is realized in the visible range. On page 957, F. Ye, M. J. Burns, and M. J. Naughton demonstrate theoretically and experimentally that asymmetric, periodic, two-element metal-insulator-metal structures can serve as reflectionless directional convertors between freely propagating visible photons and surface plasmon polaritons. These results are meaningful for varied applications in integrated nanoplasmonics, plasmonic logic, and plasmonic light harvesting.

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    Sensors: Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid–Liquid Interface (Advanced Optical Materials 10/2014) (page 905)

    Michael P. Cecchini, Vladimir A. Turek, Angela Demetriadou, George Britovsek, Tom Welton, Alexei A. Kornyshev, James D. E. T. Wilton-Ely and Joshua B. Edel

    Article first published online: 18 OCT 2014 | DOI: 10.1002/adom.201470061

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    The artwork represents the detection of trace metals using SERS and a self-assembled nanoparticle film at a water/oil interface. The gold nanoparticles and mercury are shown entering the aqueous phase and assembling at the interface whilst the Raman reporter is entering from the oil phase. On page 966, J. D. E. T. Wilton-Ely, J. B. Edel, and co-workers use this technology to create a SERS-based mercury sensor capable of mercury vapor detection. The artwork itself was produced by Christopher Wood.

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    Polarisors: Ultra-broadband Polarisers Based on Metastable Free-Standing Aligned Carbon Nanotube Membranes (Advanced Optical Materials 10/2014) (page 1008)

    Matthew T. Cole, Matthew Doherty, Richard Parmee, Paul Dawson and William I. Milne

    Article first published online: 18 OCT 2014 | DOI: 10.1002/adom.201470065

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    On page 929, M. T. Cole et al. demonstrate free-standing polarisers based on solid-state extruded multiwalled CNTs. The degree of cohesion within their membranes derives from inter-tube van der Waals interactions, intimately related to the detailed chemical vapour deposition conditions. The membranes form highly aligned, planar metastable morphologies well-suited for a range of polariser applications. For the first time, ultra-broadband polarisation (400 nm–2.5 mm) is demonstrated with the observed transmission corroborated by effective medium and full numerical simulations.