Articles

The researchers exploit exciton-to-trion conversion in ångström-thick semiconductors for all-optical detection of electrical activity in cardiomyocyte cultures. This approach affords high temporal resolution and paves the way for elusive label-free all-optical voltage-sensing applications of two-dimensional semiconductor materials in the biological domain.

Three-dimensional multiplane structured illumination microscopy, combining three-beam interference, multiplane detection and a synergistically evolved reconstruction algorithm, enables 3D imaging at rates of up to 11 volumes per second in live cells with lateral and axial spatial resolutions of 120 and 300 nm, respectively.

By resonant excitation of an InAs quantum dot embedded in a microcavity, a deterministic single-photon source is demonstrated. Single-photon purity of 0.9795(6), photon indistinguishability of 0.9856(13), and an overall end-to-end efficiency of 0.712(18) are simultaneously obtained.

Combining on-chip photon-pair sources, two sets of linear integrated circuits for path entanglements and two path-to-orbital angular momentum converters, free-space-entangled orbital angular momentum photon pairs can be generated in high-dimensional vortex states, offering a high level of programmable dynamical reconfigurability.

Cluster states with three-dimensional connectivities are realized by selecting specific time–frequency mode bases for multimode quantum light. The cluster state generation is verified by nullifier measurements as well as full inseparability tests across all possible bipartitions.

The generalized self-imaging, or generalized Talbot, effect is demonstrated in the azimuthal angle and orbital angular momentum (OAM) domains, providing both a universal strategy for fully arbitrary control of the angular petal numbers or OAM mode spacing and a general method for the realization of efficient OAM mode sorters.

A Fourier-transform imaging spectrometer enables two-dimensional spectral Brillouin imaging at a throughput of up to 40,000 spectra per second over a 300 × 300 µm² field of view.

By pairing an octave-spanning terahertz microcomb with a terahertz Vernier microcomb, a continuous-wave laser at 871 nm is frequency divided to a radiofrequency clock output at 235 MHz. This laser is designed for frequency doubling to reach the ytterbium ion clock transition at 435.5 nm.

By engineering the crystallization process of Sn–Pb mixed perovskite films, all-perovskite tandem solar cells fabricated using an antisolvent-free method deliver a certified power conversion efficiency of 28.87% and retain 87% of this efficiency after 450 h of operation.

A miniaturized diffractive neural network is fabricated on the distal facet of a multimode fibre, allowing all-optical image transportation through the fibre. With a compact footprint of 150 μm × 150 μm, the system allows the transportation of images with a minimum feature size of 4.90 μm and shows transfer learning capabilities when transporting images of biological cells projected by spatial light modulators.

The partial replacement of the A-site by divalent methylenediammonium cations inhibits ion migration and photoinduced halide segregation in wide-bandgap perovskites. Single-junction devices achieve a certified power conversion efficiency of 22.71%, whereas perovskite/Cu(In,Ga)Se₂ tandem devices exhibit an efficiency of 30.13% in a four-terminal architecture.

A superconducting nanowire two-photon coincidence counter is demonstrated with topological optimization of delay-time series. Using a hybrid time–amplitude multiplexing strategy, all 152 potential single- and two-photon events are resolved in a 16-pixel configuration.

Simultaneous measurements of the optical force and power exerted by a collimated laser beam on a 50-nm-thick silicon nitride lightsail membrane suspended by compliant micromechanical springs quantify the radiation pressure, enabling further multiphysics studies of radiation pressure forces on macroscopic objects.

Optical Einstein–Podolsky–Rosen correlation is observed on a picosecond timescale in a continuous-wave system. By introducing waveguide optical parametric amplifiers and balanced detectors, the quantum correlation 4.5 dB below the shot-noise level is observed.

Photoelectron quantum-state tomography is demonstrated in helium and argon atoms upon the absorption of ultrashort, extreme ultraviolet light pulses. The purity and degree of entanglement of a mixed photoelectron and ion state are quantified following coherent two-photon ionization using an extreme ultraviolet pulse and two infrared pulses.

Researchers demonstrate a compact photonic mmWave radar based on a 4-inch wafer-scale thin-film lithium niobate technology. Multi-target ranging with 1.50 cm resolution and velocity measurement with a resolution of 0.067 m s⁻¹ are achieved. An inverse synthetic aperture radar with a two-dimensional resolution of 1.50 cm × 1.06 cm is also demonstrated.

Lower bounds on the energy-constrained and unconstrained two-way quantum and secret-key capacities of all phase-insensitive bosonic Gaussian channels are provided. It proves that a non-zero capacity exists for all parameters where the phase-insensitive bosonic Gaussian channels are not entanglement breaking.

Using a new femtosecond laser writing technique, researchers inscribed waveguides within latched bismuth-doped iron garnet, enabling a Faraday rotator waveguide exhibiting <0.15 dB insertion loss and a figure of merit of 346° dB⁻¹. This enabled a miniaturized optical isolator waveguide with >25 dB isolation ratio and <1.5 dB insertion loss over the entire optical telecom C-band, without lenses or an external magnet.

A bimolecular doping strategy enables the realisation of white organic polarized emissive semiconductor single crystals, emitting white light with a maximum degree of polarization as high as 0.96. Organic polarized light-emitting diodes and light-emitting transistors with tuneable emission wavelength are also demonstrated.

Researchers created a periodically poled van der Waals semiconductor (3R-MoS₂) and achieved a macroscopic frequency conversion efficiency of 0.03% over a thickness of 3.4 μm. The quasi-phase-matched second harmonic signal surpasses the usual quadratic enhancement by 50% and broadband generation of photon pairs at telecom wavelength is demonstrated with a coincidence-to-accidental ratio of 638 ± 75.