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Volume 16 Issue 3, March 2022

Topological protection

Artistic impression of a topologically protected quantum entanglement emitter on a silicon-photonics chip. Entangled states, which are immune to some defects and imperfections, are generated along the boundary of the chip, which emulates an anomalous Floquet topological insulator.

See Dai et al.

Image: Tianxiang Dai and Jianwei Wang, Peking University. Cover Design: Bethany Vukomanovic


  • The field of flat lens research brings innovative nanophotonic design concepts to the world of macro-optics. However, when evaluating the performance of these lenses a lack of consistency prevents proper comparison of competing technologies. This problem can be solved by using methods developed in industry for conventional lenses.

    • Jacob Engelberg
    • Uriel Levy


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News & Views

  • A liquid crystal doped with a diarylethene enantiomer can be switched by light into stable reflection states of different colour, creating new opportunities for lasing and labelling.

    • Bohan Chen
    • Zimo Zhao
    • Stephen M. Morris
    News & Views
  • Homogenized AgBiS2 nanocrystals with enhanced light absorption have helped realize an ultrathin solar cell with a certified efficiency of 8.85%.

    • Xiaoyu Yang
    • Rui Zhu
    News & Views
  • Harnessing birefringence in a photonic chip featuring an array of coupled waveguides brings new opportunities for investigating quantum effects such as bunching and antibunching.

    • Hao Tang
    • Xian-Min Jin
    News & Views
  • Directional control of the diffusion of excitons is desired for excitonic devices, but being neutrally charged they can’t be transported by applying a bias voltage as for conventional electronic transport. It is now shown that surface acoustic waves can direct the flux of excitons over micrometre distances, even at room temperature.

    • Jorge Quereda
    • Andres Castellanos-Gomez
    News & Views
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Review Articles

  • This Review details the fundamental photonics and thermodynamics concepts that underlie the processes of radiative cooling, and discusses a few emerging directions associated with radiative cooling research.

    • Shanhui Fan
    • Wei Li
    Review Article
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Amendments & Corrections

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