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Volume 15 Issue 4, April 2021

Photonic crystal lasers

The introduction of two-dimensional spatial gain and loss into a photonic crystal laser leads to high-peak-power and short-pulse operation with a narrow beam divergence.

See Noda et al.

IMAGE: Susumu Noda and Takuya Inoue, Kyoto University COVER DESIGN: Bethany Vukomanovic.

News & Views

  • Laser-like radiation with a very large spectral coverage is obtained with a comb-like spectrum by concatenating nonlinear processes. Such a light source is extremely useful for detecting molecular trace gases.

    • Akira Ozawa
    • Thomas Udem
    News & Views


  • Four-wave mixing near atomic resonances offers new opportunities for spectral control of extreme ultraviolet pulses.

    • John E. Beetar
    • Michael Chini
    News & Views
  • More atoms can not only absorb more light but, if prepared in a particular quantum state, can also do so faster than single atoms. Now, researchers have experimentally demonstrated this time-reversed process of superradiance.

    • Matthias Zens
    • Stefan Rotter
    News & Views
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Review Articles

  • Recent effort in controlling the structure of light in all its degrees of freedom and dimensions has pushed the limits of structured light and broadened its potential beyond orbital angular momentum, two-dimensional fields, qubits and biphotons, and linear optical manipulation.

    • Andrew Forbes
    • Michael de Oliveira
    • Mark R. Dennis
    Review Article
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  • Using a metasurface that allows shaping of the polarization state of a light beam independently at each point of space along its propagation direction, longitudinally variable polarization optical components are demonstrated, inspiring new directions in structured light, polarization-switchable devices and light–matter interaction.

    • Ahmed H. Dorrah
    • Noah A. Rubin
    • Federico Capasso
  • Adapting the amplitude-modulated light detection and ranging approach to super-resolution microscopy offers a typical axial localization precision of 6.8 nm over the entire field of view and the axial capture range, enabling imaging of biological samples by up to several micrometres in depth.

    • Pierre Jouchet
    • Clément Cabriel
    • Sandrine Lévêque-Fort
  • When a laser is tuned across a split energy level, photonic diatomic molecules in two linearly coupled microresonators support the formation of self-enforcing solitary waves, featuring coherent, tunable and reproducible microcombs with up to ten times higher net conversion efficiency than the state of the art.

    • Óskar B. Helgason
    • Francisco R. Arteaga-Sierra
    • Victor Torres-Company
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Amendments & Corrections

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