Browse Articles

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.

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 m⁻²; 80% of the device external quantum efficiency lasts for 100 days in the ambient.

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%.

Molecular perdeuteration of thermally activated delayed fluorescence emitters improves the performance of blue organic light-emitting diodes, enabling a peak external quantum efficiency of 33.1% and a device lifetime to reach 80% of initial luminance of over 1,300 h.

Two precursor additives improve the performance of tin-based perovskite solar cells, delivering a power conversion efficiency of 15.38% and maintaining 93% of the initial efficiency after 500 h of continuous illumination.

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.

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.

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.