Reviews & Analysis

Filter by:

  • Directly relating the complex second-harmonic-generation field to the second-order susceptibility tensor allows tomographic imaging of nonlinear optical contrast at high frame rates.

    • Paul J. Campagnola
    News & Views
  • Recent improvements of the operation speed of variable optical elements are reviewed with an emphasis on components with microsecond focus-varying response time.

    • SeungYeon Kang
    • Martí Duocastella
    • Craig B. Arnold
    Review Article
  • A correlation method that combines ultrasound and fluorescence enables imaging in strongly scattering environments.

    • Allard P. Mosk
    News & Views
  • A phase transition between disordered and quasi-ordered states, known as the Berezinskii–Kosterlitz–Thouless transition, has now been revealed in a two-dimensional photonic ‘fluid’. The interplay between phase singularities and coherence may lead to new vortex-based optical applications.

    • Matthieu Bellec
    • Claire Michel
    News & Views
  • New methods to control how laser pulses propagate inside a plasma could signify the start of a global race to demonstrate truly high-energy compact particle accelerators.

    • Rob J. Shalloo
    • Stuart P. D. Mangles
    News & Views
  • The finding that hollow-core optical fibres can preserve the state of linearly polarized light over hundreds of metres with exceptional purity could benefit applications in sensing, gyroscopes and quantum optics.

    • Alexey V. Gladyshev
    • Igor A. Bufetov
    News & Views
  • Using a photonic chip to generate the patterns of light needed for structured illumination microscopy could reduce the cost and complexity of super-resolution imaging.

    • Sara Abrahamsson
    News & Views
  • Optical clocks held at slightly different heights provide a stringent test of general relativity comparable to space experiments and open new opportunities for clock-based geophysical sensing.

    • Kai Bongs
    • Yeshpal Singh
    News & Views
  • A particular class of focused, pulsed light beams can propagate self-similarly in free space at a fixed group velocity. Now, scientists present a law of refraction that determines how the group velocity of these beams changes as they refract at an interface between two materials.

    • Vincent Ginis
    News & Views
  • By utilizing exciton resonances in atomically thick semiconductors, researchers have now demonstrated the ultimate downscaling of optical lenses and reported on their efficacious electrical tunability.

    • Alex Krasnok
    News & Views
  • Asymmetric forward and backward transmission through photonic structures can be achieved via optical nonlinearities, but existing systems have typically used slow thermo-optic effects. A new resonator design has now enabled low-loss, non-reciprocal pulse routing based on the Kerr nonlinearity in integrated silicon waveguides.

    • Eric A. Kittlaus
    • Peter O. Weigel
    • William M. Jones
    News & Views
  • Advanced computational imaging techniques have the potential to extract neural activity patterns from scattered data without reconstructing images.

    • Gordon Wetzstein
    • Isaac Kauvar
    News & Views
  • A monolithic chip-scale ring laser gyroscope based on both Brillouin and Sagnac effects provides a sensitivity sufficient to measure sinusoidal rotations with an amplitude as small as 5 degrees per hour, thus enabling the first on-chip Earth rotation measurement.

    • Thibaut Sylvestre
    News & Views
  • Using a photonic crystal slab combined with a conventional optical imaging system, a two-dimensional optical image differentiator is experimentally demonstrated for edge detection.

    • Wei Yan
    • Min Qiu
    News & Views
  • Delegates at the BiOS symposium heard how artificial intelligence can transform medical imaging, with its ability to improve quality, speed and molecular specificity.

    • Rachel Won
    Meeting Report
  • Dark-field microscopy is a widely used imaging method that emphasizes sharp edges and other small features, but typically requires specialized microscope components. Researchers have now engineered special substrates that enable dark-field microscopy using simple bright-field microscopes.

    • Mikhail A. Kats
    News & Views