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  • Researchers demonstrate a self-calibrating programmable photonic integrated circuit. The findings may be useful for the accurate control of large-scale photonic integrated circuits in applications such as light-based machine learning.

    • Xingyuan Xu
    • Guanghui Ren
    • Arthur J. Lowery
    Article
  • Researchers demonstrate an integrated mirror-symmetric non-reciprocal device enabled by three coupled photonic resonators. Nearly 40 dB of isolation is achieved at telecommunications wavelengths using 75 mW of radiofrequency power.

    • Jason F. Herrmann
    • Vahid Ansari
    • Amir H. Safavi-Naeini
    Article
  • Linearly polarized orbital angular momentum-carrying hard X-ray beams are induced using spiral Fresnel zone plates. By sending the hard X-ray beams to disordered enantiopure molecular complexes, the helicity-dependent and chiral-sensitive signal is obtained.

    • Jérémy R. Rouxel
    • Benedikt Rösner
    • Majed Chergui
    Article
  • In order to simplify and streamline our processes, Nature Photonics is moving to a single format for its primary research submissions

    Editorial
  • Coherent multi-octave mid-infrared waveforms are created and manipulated by cascaded intrapulse difference-frequency generation, demonstrating absolute phase control, and adding to the growing arsenal of techniques for arbitrary light-wave control.

    • Jeffrey Moses
    • Shu-Wei Huang
    News & Views
  • The ability to create complex three-dimensional structures of light has reached new heights with the experimental observation of two distinct kinds of toroidal pulses, the optical analogue of smoke rings.

    • Filippo Cardano
    • Lorenzo Marrucci
    News & Views
  • Ferroelectric domain switching controlled by electrical pulses provides a controllable means to tune the refractive index of BaTiO3 thin films. Now, a device based on this material is presented that is capable of implementing low-power, high-speed and CMOS-compatible programmable phase shifters in silicon photonic chips.

    • José Capmany
    • Daniel Pérez-López
    News & Views
  • One hundred years ago, in 1922, Léon Brillouin discovered the scattering of light by sound waves. Within an optical fibre, Brillouin scattering may be used to create narrow-linewidth filters and spectrometers. A twisted optical fibre is now used to reduce these linewidths by over an order of magnitude, down to the sub-MHz level.

    • Thiago Alegre
    • Gustavo Wiederhecker
    News & Views
  • Pulses of light with a toroidal structure are experimentally realized in the terahertz and optical regions.

    • Apostolos Zdagkas
    • Cormac McDonnell
    • Nikolay I. Zheludev
    Article
  • Strained NbOI2 flakes with a thickness of 20 nm exhibit a record SHG absolute conversion efficiency of >0.2% and an effective bulk-like nonlinear susceptibility of 1.1 × 10−9 m V−1 at the fundamental wavelength of 1,050 nm. The spatial profile of the polarized second-harmonic generation response can be tuned by the fundamental wavelength.

    • Ibrahim Abdelwahab
    • Benjamin Tilmann
    • Kian Ping Loh
    Article
  • Asymmetric parametric generation of light in nonlinear metasurfaces is enabled by nonlinear dielectric resonators in translucent metasurfaces. Upon infrared illumination, different and independent visible light images are detected for ‘forwards’ versus ‘backwards’ operation.

    • Sergey S. Kruk
    • Lei Wang
    • Yuri Kivshar
    Letter
  • Giant effective photon–photon interactions are achieved by hybridizing light with excitons in an InGaAs-based quantum well micropillar cavity. Cross-phase modulation of up to 3 mrad per polariton is observed at the laser intensity below the single-photon level.

    • Tintu Kuriakose
    • Paul M. Walker
    • Dmitry N. Krizhanovskii
    Letter
  • Tunable sub-megahertz spectral features are demonstrated without resonators. The approach, which exploits gain-enhanced polarization pulling in a twisted birefringent medium, may be useful in applications such as microwave photonic filters, slow and fast light, and optical sensing.

    • Neel Choksi
    • Yi Liu
    • Li Qian
    Article
  • High-harmonics spectroscopy reveals the closure of the bandgap between adjacent conduction bands in solids driven by high-intensity laser fields, providing insight into light-driven modifications of band structures

    • Dieter Bauer
    News & Views
  • The strongly temperature-dependent band-edge absorption from gallium arsenide enables an optical thermometer with nanokelvin temperature resolution and microscale spatial resolution.

    • Chaman Gupta
    • Peter J. Pauzauskie
    News & Views