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A wireless optoelectronic probe integrates a microscale light-emitting diode and a photodetector coated with oxygen-sensitive dyes to monitor the partial pressure of oxygen in the deep brain of freely moving mice.
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.
Single-shot angle-resolved Brillouin light scattering microscopy enables spatiotemporal mapping of mechanical anisotropy in living cells with a spatial resolution below 2 µm and precision in the Brillouin frequency shift of 10 MHz.
The organic molecule entinostat improves adhesion between the perovskites and substrates, leading to mechanically robust solar cell minimodules with an area of 9 cm2 and power conversion efficiency of 19%.
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.
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.
By combining engineered dispersion and chirped quasi-phase matching in multisegment nanophotonic thin-film lithium niobate waveguides, the generation of gap-free frequency comb spanning from 330 to 2,400 nm can be realized with only 90 pJ of pulse energy at 1,550 nm.
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.
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.
Luminescence solar concentrators are improved by using a laminated structure that creates a practically non-decaying optical ‘guard rail’ for light. Design rules enabled external quantum efficiencies as high as 45% for 450 nm light, yielding a device efficiency of 7.6%, probably useful for energy-harvesting windows.
Using a self-referenced attosecond photoelectron interferometry on helium atoms, the electron subcycle motion along the light propagation direction is observed in the 15 pm range. A time delay of 15 ± 10 as between the electric-dipole and electric-quadrupole transitions is also revealed.
Dynamic resonance fluorescence spectra beyond the Mollow-triplet are observed in a In(Ga)As quantum dot in a micropillar. Multiple side peaks, excitation-induced spectral asymmetry, and cavity filtering effects are experimentally observed and theoretically reproduced by a full quantum model that includes phonon-induced decoherence.
Frequency-modulated terahertz continuous waves are generated from Josephson junctions included in a cuprate superconductor. When 3 GHz sinusoidal waves were superimposed on 840–890 GHz carrier waves, the modulation bandwidth reached 40 GHz when a Josephson plasma emission was utilized.
A switchable deprotonation reaction at the interface between the perovskite and electron-transporting layer enables bright deep-red perovskite LEDs emitting at 691 nm with a half-lifetime of about 50.3 h at 100 mA cm–2.
A skyrmion is a topologically stable field configuration. A non-local skyrmion, which has been hitherto elusive in condensed-matter physics, is realized by using entangled photons with a non-trivial topology. The connection between the notions of topology and entanglement is investigated, revealing topological invariance even when entanglement is fragile.
Ammonium bromide is shown to passivate deep traps on FAPbBr3 surfaces, improving the charge collection efficiency to near unity in perovskite gamma-ray devices. The approach yielded tenfold improvements in dark current, and the energy resolution of 137Cs spectra acquired using FAPbBr3 detectors was improved from 5.7% to 1.7%.
Controlling the intrinsic doping of lead-free perovskites enables near-infrared LEDs emitting at 948 nm with a peak radiance of 226 W sr–1 m–2 and a half-lifetime of 39.5 h.
Exploiting the signal correlation between multiple quantum sensors enables measuring overlapping signals from multiple targets, as demonstrated by imaging point defects in a diamond with an accuracy of 1.7 nm.
A terahertz focal-plane array based on a two-dimensional array of plasmonic photoconductive nanoantennas offers high-quality imaging in the terahertz region.