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Transient visible-pump terahertz-probe near-field microscopy enables the simultaneous retrieval of the local chemical composition, crystallographic structure, topography and out-of-plane charge-carrier diffusion in perovskite films.
Imaging the visible light emitted from accelerated electron bunches reveals important information about the three-dimensional charge structure of the bunches, which strongly influences the performance of free-electron lasers.
Real-time electron dynamics studies of complex systems require bright attosecond pump-probe capabilities at X-ray wavelengths. Nano-focusing schemes reaching intensities in excess of 1022 W cm–2 and superradiant cascaded amplification of attosecond pulses to TW powers at free-electron lasers are providing transformative capabilities in this burgeoning field.
Following first lasing at LCLS-II — a coherent X-ray laser source driven by a 700-m superconducting linear accelerator — several upgrades are already in the works. Nature Photonics spoke to LCLS director Mike Dunne about LCLS-II commissioning hurdles as well as future plans.
Global proliferation of free-electron laser X-ray sources has improved accessibility. Now the race is on for high repetition rates, attosecond pulses, and full coherence.
Novel optical components that withstand high-power laser irradiation and micro light-emitting diodes capable of full-colour emission were highlights of the Japan Society of Applied Physics Spring Meeting.
The electrochemical triggering of fluorophores in dSTORM enables one to actively control their switching behaviours, resulting in improved spatial resolution and precise molecular counting down to the single molecule level in emitter-dense areas.
A high-dimensional photodetection system that combines a lens and a thin-film interface enables simultaneous measurements of light spectrum and polarization states, with the aid of a deep neural network.
Broadband energy can be delivered to extended targets deep inside a multiple-scattering system, paving ways for using broadband, partially incoherent light in a wide range of applications, such as deep-tissue imaging, laser therapy and optogenetics.
A new design of electron gun that uses terahertz waves to accelerate electrons in a high field gradient brings a tabletop answer to the generation of ultrashort electron bunches.
Ångström-scale terahertz time-domain spectroscopy is demonstrated in a lightwave-driven scanning tunnelling microscope. Employing a metal surface as a reference, local terahertz near-fields are used for spectroscopy of a single atom resonator defect in doped gallium arsenide.
Free-electron Ramsey imaging enables space-, time- and phase-resolved electron imaging of weak optical near fields. Owing to its phase-resolving ability, this technique images chiral vortex–anti-vortex phase singularities of phonon-polariton modes in hexagonal boron nitride.
High-entropy hybrid perovskites exhibit improved materials properties compared with their individual components. When employed in solar cells, champion devices achieve a certified power conversion efficiency of 25.5% and an extrapolated T90 lifetime of over 5,000 h under continuous light soaking.
A wide-field wavefront sensor consisting of a microlens array on the native image plane enables observation of atmospheric turbulence over a field of view of 1,100 arcsec at 30 Hz with an 80 cm telescope. With the aid of a neural network, turbulence can be predicted 33 ms in advance.
Shortwave infrared photothermal microscopy enables chemical imaging at millimetre depths with a micrometre spatial resolution in tissue-mimicking phantoms, intact tumour spheroids and various biological tissues.
Exploiting the energy transfer between the host triplet states and spin doublet exciton states of a radical organic emitter enables near-infrared organic light-emitting diodes with an external quantum efficiency up to 9.6% at an emission wavelength of 800 nm.
Spatial distribution of the photoluminescence of interlayer excitons in van der Waals heterostructures comprising MoSe2 and WSe2 monolayers and encapsulated in rather thick hexagonal boron nitride is investigated, revealing interlayer exciton long-range transport with 1/e decay distances reaching and exceeding 100 μm.