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  • An integrated high-energy laser that combines a passively Q-switched laser cavity based on a silicon-nitride photonic integrated circuit with an optically pumped gain layer consisting of thulium-doped alumina is reported, representing a pivotal advancement in integrated pulsed lasers.

    • Neetesh Singh
    • Jan Lorenzen
    • Franz X. Kärtner
    ArticleOpen Access
  • Electrical excitation of a perovskite light-emitting diode is shown to contribute to optical gain, a milestone on the path towards a non-epitaxial laser diode.

    • Barry P. Rand
    • Noel C. Giebink
    News & Views
  • The fast response and efficiency of plastic scintillators are severely degraded by the preferential population of slow triplet excited states in luminescence centres, such as in dye molecules. This issue can be solved by hot exciton manipulation, which avoids population of the lowest triplet state.

    • Martin Nikl
    News & Views
  • Nonlinear optical resonators allow the coherent conversion of photons, yet fabrication tolerances limit their wavelength accuracy. Introducing periodic modulation in ring resonators is shown to allow robust and predictable selection of the converted photons.

    • Alfredo De Rossi
    • Sylvain Combrié
    News & Views
  • A chemical washing method called solvent sieve is developed to resolve the phase dimension issue of metal halide perovskites. The sieved perovskites demonstrate a record external quantum efficiency of 29.5% and a T50 lifetime of 18.67 h at 12,000 cd m2; 80% of the device external quantum efficiency lasts for 100 days in the ambient.

    • Shuo Ding
    • Qiangqiang Wang
    • Chaoyu Xiang
    Article
  • A reflective spatial light modulator for extreme ultraviolet (EUV) or soft X-ray light is demonstrated in an electronic Wigner crystal material with a sub-90-nm feature size. The diffraction grating imprinted by sub-picosecond EUV beams is rewritable. The projected efficiency according to the modelling exceeds 1%.

    • Igor Vaskivskyi
    • Anze Mraz
    • Dragan Mihailovic
    ArticleOpen Access
  • An optical readout technique for the chemical potential of an arbitrary two-dimensional material is realized using a monolayer transition metal dichalcogenide semiconductor sensor whose optical response sharply depends on the chemical potential.

    • Zhengchao Xia
    • Yihang Zeng
    • Kin Fai Mak
    Article
  • Addition of a multifunctional ionic additive in mixed two-dimensional–three-dimensional bromide/chloride perovskites enables efficient blue perovskite LEDs with external quantum efficiency of up to 21.4% and half-lifetime of 129 min at an initial luminance of 100 cd m–2.

    • Shuai Yuan
    • Linjie Dai
    • Richard H. Friend
    Article
  • Nonlinear multidimensional spectroscopy that can image the sub-cycle dynamics of strongly correlated systems on the sub-femtosecond timescale is demonstrated by using the carrier–envelope-phase dependence of the correlated multielectron response to decode the complex interplay between different many-body states.

    • V. N. Valmispild
    • E. Gorelov
    • O. Smirnova
    ArticleOpen Access
  • Superconducting electro-optic modulators for a cryogenic-to-room-temperature link are demonstrated. The record-low half-wave voltage of 42 mV is achieved on a 1-m-long modulator. By matching the velocity of microwave and optical signals, a 0.2-m-long modulator can achieve a 3 dB bandwidth of over 17 GHz.

    • Mohan Shen
    • Jiacheng Xie
    • Hong X. Tang
    Article
  • Photonic crystal microring resonators with a periodic corrugation inscribed along the resonator’s circumference allow programmable synthetic reflection for self-injection-locked microcombs and their operation exclusively in the single-soliton regime.

    • Alexander E. Ulanov
    • Thibault Wildi
    • Tobias Herr
    ArticleOpen Access
  • Using programmable integrated photonics to generate a higher-order free-space structured light beam promises lossless and reconfigurable control of the spatial distribution of light’s amplitude and phase with very short switching times.

    • Johannes Bütow
    • Jörg S. Eismann
    • Peter Banzer
    ArticleOpen Access
  • Researchers overcome the typical scintillator trade-off between high efficiency and speed. In organic scintillators, researchers drove hot excitons into fast singlet emission states without involving the lowest triplet states, which led to a fast radiative lifetime and strong light yield that may be applicable to ultrafast detection and imaging.

    • Xinyuan Du
    • Shan Zhao
    • Jiang Tang
    Article