Articles in 2024

The authors introduce a loss-enhanced magneto-optical effect and sublinearly amplify the frequency response of a non-Hermitian optical cavity under different background magnetic fields. This effect is exploited to detect subtle magnetic field variations against a strong background with enhanced system response and sensitivity.

Researchers use organic ligands to reclaim energy lost during the relaxation of secondary X-rays generated by the interaction of high-energy particles with scintillators. Enhanced radioluminescence within lanthanide metal complexes and capture of dark triplet excitons with near-unity extraction efficiency are achieved.

By considering waves from a bounding spherical volume, a clear onset of a tunnelling escape of waves that both defines a limiting number of well-coupled channels for any volume and explains the subsequent rapid fall-off of coupling strengths can be obtained.

Researchers experimentally demonstrate a fully integrated coherent optical neural network. The system, with six neurons and three layers, operates with a latency of 410 ps.

A diamond storage medium that uses fluorescent vacancy centres as robust storage units provides a high storage density of 14.8 Tbit cm⁻³.

Orbital angular momentum transfer from optical vortex beams to electronic quantum Hall states is reported in a graphene sheet, showing a robust contribution to the radial photocurrent that depends on the vorticity of light.

Using the European XFEL free-electron laser, researchers demonstrate terawatt-scale, attosecond hard X-ray pulses. Ten pulse trains per second, each containing hundreds of pulses at megahertz repetition rates, are achieved. Such short and intense pulses at high repetition rate enable unprecedented damage-free X-ray measurements with attosecond temporal resolution.

Topological protection in disclination lattices that relies on non-trivial winding in momentum space and real space is used to confine and guide vortices that feature arbitrary high-order charges. This approach could help in the development of orbital angular momentum-based photonic devices.

Optical realization of photonic time crystals can be achieved by using temporal variations in a resonant material to expand the momentum bandgap, even at low modulation strengths, with known low-loss materials and realistic laser pump powers.

Co-deposition of copper thiocyanate with perovskite on textured silicon enables an efficient perovskite-silicon tandem solar cell with a certified power conversion efficiency of 31.46% for 1 cm² area devices.

Sub-cycle phase-resolved attosecond interferometry is developed. The obtained phase information enables us to decouple the multiple quantum paths induced in a light-driven system, isolating their coherent contribution and retrieving their temporal evolution.

Using spin-5/2 nuclei of ¹⁷³Yb atoms trapped in an optical lattice, a Schrödinger-cat state persists for a coherence time of 1.4 × 10³ s. In measuring external magnetic fields, the cat state exhibits a sensitivity approaching the Heisenberg limit.

Researchers use a DNA-mediated approach for the programmable assembly of octahedron-shaped plasmonic gold nanocrystals into nonlinear optical metacrystals. A maximum second-harmonic generation conversion efficiency of 10⁻⁹ is demonstrated.

Tabletop, water-window X-rays are generated using free-electron-driven van der Waals materials. The X-ray energy from the source can be tuned across the water window, and the established fundamental scaling laws for the tunable photon flux may enable the design of powerful emitters based on free-electron-driven quantum materials.

Researchers demonstrate optical weights for in-memory photonic computing using magneto-optic memory cells comprising Ce:YIG on silicon micro-ring resonators. Non-reciprocal phase shift provides a fast, efficient and robust integrated optical processing platform.

Near-petahertz electric field detection of few-femtosecond pulses with a temporal resolution of 200 attoseconds and subfemtojoule sensitivity is experimentally demonstrated, paving the path towards high-resolution biological spectro-microscopy.

Guide-star-free imaging through turbid media is achieved by computational back-projection and averaging of as few as 25 holographically measured scattered fields under a random unknown illumination.

Deep-ultraviolet micro-light-emitting diodes based on aluminium gallium nitride are fabricated for maskless photolithography. The peak wavelength is 270 nm, and the 3 μm device achieved a peak external quantum efficiency of 5.7% and a maximum brightness of 396 W cm^–2.

Both laser stabilization and isolation are demonstrated simultaneously by using Kerr nonlinearity in a high-Q silicon nitride ring resonator to self-injection lock a distributed-feedback laser, bringing on-chip lasers closer to real-world fully integrated applications.

Polarization-entangled photon pairs are generated from two perpendicularly aligned two-dimensional crystals of NbOCl₂. The polarization-entangled state is measured with a fidelity up to 86%. The measured count rate normalized to pump power and interaction length is 472 Hz mW⁻¹ mm⁻¹.