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Volume 18 Issue 2, February 2019

Volume 18 Issue 2

The power of two

An optimized design for broad-area surface-emitting photonics-crystal laser leads to high brightness of over 300 MW cm−2 sr−1 and an output power of 10 W under pulsed excitation.

See Yoshida et al.

Image: Susumu Noda and Masahiro Yoshida, Kyoto University. Cover Design: David Shand

Editorial

News & Views

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    By combining metal ions, organic linkers and polymers, ordered frameworks with controlled crystallite size can form. When fabricated into membranes, they combine superlative CO2/N2 separation properties with good hydrolytic stability.

    • Joshua D. Moon
    • Benny D. Freeman
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    A single dopant molecule can exchange more than one charge with the hosting polymer semiconductor, doubling the maximum doping efficiency achievable.

    • Björn Lüssem
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    A vaccine platform developed from a synthetic polymeric glyco-adjuvant and reversibly conjugated to an antigen was shown to target dendritic cells leading to cellular and humoral immune response against malaria.

    • Yvette van Kooyk
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    A photonic crystal design, consisting of two separated lattices arranged in a specific way, forms the base of high-brightness semiconductor lasers, with a very narrow beam divergence angle.

    • L. Kuipers
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    Higher-order topological acoustic metamaterials on kagome lattices, which host topologically protected corner states, can confine sound at corners. This may lead to applications of acoustic metamaterials in local acoustic field enhancement, trapping and manipulating of particles, and acoustic sensing and probing.

    • Zhengyou Liu
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    Despite an enormous number of nanopores that could, in principle, be formed in atomically thin materials, advanced modelling reveals that in typical experiments rather limited ensembles of most likely nanopores should be observed.

    • Petr Král

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