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Using a thin-film lithium niobate photonic platform, an electro-optic frequency comb generator is realized that is capable of producing wide and stable spectra, spanning more frequencies than the entire telecommunications L-band.
Coherent perfect absorption in a disordered medium is demonstrated experimentally in the microwave regime through the realization of a random anti-laser that absorbs engineered radiation with near-perfect efficiency.
A mechanism for creating patterns of iridescent structural colour by total internal reflection of light beams along a concave optical interface leading to interference is described, for complex microscopic systems and for systems as simple as condensed water drops.
A spatially oscillating two-dimensional waveguide array is used to realize a photonic topological insulator in synthetic dimensions with modal-space edge states, unidirectionality and robust topological protection.
The ‘negative luminescence’ of a reverse-biased photodiode is harnessed to draw thermal energy from a nearby solid object, thereby realizing photonic cooling without the use of coherent laser radiation.
Waveguide quantum electrodynamics is used to couple a single collective excitation of an atomic array to a nanoscale waveguide; the excitation is stored and later read out, generating guided single photons on demand.
A three-dimensional photonic topological insulator is presented, made of split-ring resonators with strong magneto-electric coupling, which has an extremely wide topological bandgap, forbidding light propagation.
Improved techniques allow the measurement of a frequency difference with an uncertainty of the order of 10–19 between two independent atomic optical lattice clocks, suggesting that they may be able to improve state-of-the-art geodetic techniques.
Cooperative quantum effects in superlattices of quantum dots made of caesium lead halide perovskite give rise to superfluorescence, with the individual emitters interacting coherently to give intense bursts of light.
After alloying with metal cations, a lead-free halide double perovskite shows stable performance and remarkably efficient white-light emission, with possible applications in lighting and display technologies.
The displacement of a mechanical resonator is measured to within 35% of the Heisenberg uncertainty limit, enabling feedback cooling to the quantum ground state, nine decibels below the quantum-backaction limit.
Contrary to current expectation, eavesdropping on terahertz wireless data links is shown to be easier than expected, by placing an object in the path of the signal that scatters part of it to a receiver located elsewhere.
A strategy for managing the compositional distribution in metal halide perovskite light-emitting diodes enables them to surpass 20% external quantum efficiency—a step towards their practical application in lighting and displays.
The formation of submicrometre-scale structure in perovskite light-emitting diodes can raise their external quantum efficiency beyond 20%, suggesting the possibility of both high efficiency and high brightness.
Integrating an optical Kerr frequency comb source with an electronically excited laser pump produces a battery-powered comb generator that does not require external lasers, moveable optics or laboratory set-ups.
Chip-scale lithium niobate electro-optic modulators that rapidly convert electrical to optical signals and use CMOS-compatible voltages could prove useful in optical communication networks, microwave photonic systems and photonic computation.
Time-asymmetric light transmission over the entire optical communications band is achieved using a silicon photonic structure with photonic modes that dynamically encircle an exceptional point in the optical domain.
Efficient terahertz harmonic generation—challenging but important for ultrahigh-speed optoelectronic technologies—is demonstrated in graphene through a nonlinear process that could potentially be generalized to other materials.
All-inorganic perovskite nanocrystals containing caesium and lead provide low-cost, flexible and solution-processable scintillators that are highly sensitive to X-ray irradiation and emit radioluminescence that is colour-tunable across the visible spectrum.
A counter-intuitive state—known as a topological Anderson insulator—in which strong disorder leads to the formation of topologically protected rather than trivial states is realized in a photonic system.
A scalable thermal drawing process is used to integrate light-emitting and photodetecting diodes into textile-ready polymer fibres, which can be woven into fabrics with possible optical communication and health monitoring applications.
Heterobilayer excitonic devices consisting of two different van der Waals materials, in which excitons are shared between the layers, exhibit electrically controlled switching actions at room temperature.
The fundamental limits to plasmon damping in graphene are determined using nanoscale infrared imaging at cryogenic temperatures, and plasmon polaritons are observed to propagate over 10 micrometres in high-mobility encapsulated graphene.
An optical-frequency synthesizer based on stabilized frequency combs has been developed utilizing chip-scale devices as key components, in a move towards using integrated photonics technology for ultrafast science and metrology.
Quantum entanglement is demonstrated in a system of massive micromechanical oscillators coupled to a microwave-frequency electromagnetic cavity by driving the devices into a steady state that is entangled.
A way of integrating photonics with silicon nanoelectronics is described, using polycrystalline silicon on glass islands alongside transistors on bulk silicon complementary metal–oxide–semiconductor chips.
Quantum-well photodetectors fabricated from photonic metamaterials show enhanced room-temperature sensitivity to long-wavelength infrared radiation and produce gigahertz-frequency heterodyne signals when pumped with quantum cascade lasers.
A quantized quadrupole topological insulator composed of capacitively coupled microwave resonators has corner states that are protected by bulk topology and exhibit exceptional robustness against edge deformation.
Using optical mapping and 3D ultrasound, the dynamics and interactions between electrical and mechanical phase singularities were analysed by simultaneously measuring the membrane potential, intracellular calcium concentration and mechanical contractions of the heart during normal rhythm and fibrillation.
Photophoretic optical trapping of cellulose particles and persistence of vision are used to produce real-space volumetric images that can be viewed from all angles, in geometries unachievable by holograms and light-field technologies.