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Multilayer graphene is a promising electronic material because of its tunable band structure and pseudospin properties. Campos et al.show giant conductance oscillations in a ballistic trilayer graphene Fabry-Pérot interferometer that can be suppressed both classically and quantum mechanically.

Broadband Fabry–Pérot etalons are used as calibration sources in radial velocity exoplanet detection. This Article explores their performance limits and models the physical mechanism behind their complex measured chromatic drift.

Electrochromic devices are generally not capable of tuning more than one color. Here, the authors use Fabry-Perot nanocavities to create electrochromic devices with a wide color tuning range and vibrant color.

Researchers present a cost-effective approach to make electrically driven random lasers, by modifying commercially available laser diodes.

Optical nonreciprocity is of fundamental importance for signal processing in modern optical communication systems but is still facing issues on either high energy consumption, complicated design or on-chip integration. Here, an all-fiber device, containing two mutually coupled Fabry-Perot resonators to realize broken parity-time (PT) symmetry is demonstrated, which may find applications in software-defined optical networks.

Coherent control of plasmon wavepackets is essential for quantum information processing using flying electron qubits. Here, the authors demonstrate a method to isolate and select electron channels contributing to a plasmon using a cavity formed by local constrictions, enabling precise control of plasmon eigenstates.

Wave destabilization is demonstrated in semiconductor ring lasers operating at low pumping levels, where ultrafast gain recovery leads to the emergence of a frequency comb regime owing to phase turbulence.

The authors report by homogeneously integrating a ring quantum cascade laser with a passive waveguide geometry, it is possible to reach a stable and tunable quantum walk comb state while improving the light outcoupling by 2 orders of magnitude.

Blue light-emitting diodes with a light extraction efficiency of 73% are reported. The InGaN–GaN devices use a photonic-crystal structure for superior optical mode control; their performance has been characterized experimentally and modelled theoretically.

Understanding localization and delocalization phenomena is important for studying wave propagation in many types of disordered photonic systems. Here, a theoretical study of one-dimensional photonic crystal structures reveals the importance of Fano interference in wave transport in the presence of disorder.

Liu et al. experimentally demonstrate a terahertz chaos source based on a terahertz quantum cascade laser without any external perturbations. It is found that the chaos generation in the terahertz laser is ascribed to the defect-mediated turbulence.

Current applications of NV centers in diamond as spin-photon interfaces for quantum networks are limited by low coherent photon emission. Here, the authors integrate a coherently controlled NV spin qubit with an open microcavity to achieve Purcell-enhanced emission and demonstrate spin-photon state generation.

Heterostructures of graphene and a superconducting metal allow Josephson junctions to be studied in a regime characterized by ballistic transport.

Indium antimonide nanowires have large spin-orbit coupling, which can give rise to helical states that are an important part of proposals for topological quantum computing. Here the authors measure conductance through the helical states and extract a larger spin-orbit energy than obtained before.

The authors implement on-chip Rydberg exciton-polaritons by coupling WS₂ monolayers to a photonic crystal. Rydberg polaritons exhibit a nonlinearity of 8.0 ± 2.3 times larger than that of the ground polaritonic states due mostly to their extended exciton radii and photonic crystal-induced spatially localized electric field distribution.

Photonic solutions for generating free space millimeter radiation is a fast developing field that combines optoelectronics and RF domains but has many challenges. Here the authors present a quantum cascade laser (QCL) based solution for THz laser emission and millimeter wave generation in a single device.

Momentum mismatch prevents efficient coupling between free space photons and hyperbolic phonon polaritons. The authors show, using far-field infrared spectroscopy, infrared nanoimaging and numerical simulations, that resonant metallic antennas can efficiently launch hyperbolic phonon polaritons in thin h-BN slabs.

Free-running stable optical dissipative solitons, called Nozaki–Bekki solitons, are created in a ring semiconductor laser; their spontaneous formation with tuning of laser bias eliminates the need for an external optical pump.

New fully integrated semiconductor laser architectures are shown to be able to generate bright and background-free picosecond solitons at GHz repetition rates in the mid-infrared range.

Multiphoton-pumped lasing from semiconductor nanocrystals in solution is difficult due to Auger recombination, low volume fraction and high threshold. Here, Li et al. demonstrate photostable, ultralow threshold multi-photon pumped lasing from colloidal CdSe/CdS nanoplatelets in a Fabry-Pérot optical resonator.

Graphene mechanically controlled break junctions show room-temperature quantum interference effects as a function of sub-nanometre displacements.

Interfacing superconducting quantum information processors with long-distance optical networks would require coherent interfacing between microwave and optical photons. Here, the authors show a chip-integrated microwave-to-optical transducer based on rare earth ion ensembles.

Although fractal optical patterns have been realized previously, the direct generation of fractal modes from a laser has proven challenging. Here, Rivera et al. modify an optical cavity with a microsphere array to produce fractal laser modes and probe live cells, which serve as a component of the resonator.

Controlling sound waves is important to build better acoustic devices, and much can be learnt from optical approaches. To this end, Quan et al.show how periodic arrays of Helmholtz resonators on metal plates can produce dipole-like radiation patterns for sound.

Integrating UV lasers is of interest for portable optical clocks and ion-based quantum computers, but material absorption has impeded progress. Here, authors demonstrate a violet integrated laser using UV-transparent materials with mW-level output, narrow linewidth and precise frequency control.

A lithium niobate nonlocal metasurface with high-Q (~8000) resonances demonstrates efficient GHz-rate reflectivity modulation (~0.1) and one order of magnitude second harmonic modulation using sub-10V driving voltages, offering promising applications in high-speed nanophotonics.

Metamaterial analogues of electromagnetically-induced transparency provide interesting optical components and applications. By actively tuning the dark mode of a metamaterial, Guet al. optically control its electromagnetically-induced transparency, showing tunable group delay of terahertz light.

In this work, Manenti et al. present measurements of a device in which a tuneable transmon qubit is piezoelectrically coupled to a surface acoustic wave cavity, realising circuit quantum acoustodynamic architecture. This may be used to develop new quantum acoustic devices.

A transmon qubit insensitive to magnetic fields is a crucial element in topological quantum computing. Here, Kroll et al. create graphene transmons by integrating monolayer graphene Josephson junctions into microwave frequency superconducting circuits, allowing them to operate in a parallel magnetic field of 1 T.

Inspired by thermal expansion and refractive index changes in the nanostructures of iridescent Morpho butterfly scales, scientists demonstrate upconverted mid-wave infrared detection with a temperature sensitivity of 18–62 mK and a heat-sink-free response speed of 35–40 Hz.

An optical cavity coupled to a micrometre-sized mechanical resonator offers the opportunity to see quantum effects in relatively large structures. It is now shown that a variety of coupling mechanisms enable investigation of these fascinating systems in a number of different ways.

Quantum Hall interferometers have proven to be a useful platform for the study of fractional statistics. Here, the authors experimentally study the effect of Coulomb interactions between bulk and edge charges on the interferometer behavior, validating previous theoretical predictions.

The authors combine films of two-dimensional semiconductors, which exhibit excitonic spectral features, with SiO₂/Si Fabry-Perot resonators in order to realize topological phase singularities in reflection. Around these singularities, the reflection spectra demonstrate rapid phase changes while the structure behaves as a perfect absorber.

In an interferometer using the ballistic propagation of electrons in a quantum Hall conductor, the phase of a single-electron wavefunction can act as a sensor for the detection of fast electric fields of small amplitude.

A passively mode-locked quantum cascade laser (QCL) is developed by employing a heterogeneous gain medium and integrating graphene saturable absorbers along the entire QCL waveguide. Self-starting optical pulses of 4.0 ps are electrically generated in the 2.30–3.55 THz frequency range.

Controlling the excitation energy transfer between photosynthetic light-harvesting complexes is key for advancing artificial photosynthetic systems. Here, the authors report the enhanced excitation energy transfer between photosynthetic light-harvesting 2 complexes (LH2) mediated by an optical microcavity in both strong and weak exciton-photon coupling regimes.