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Strain-engineered pseudomagnetic fields realized in two-dimensional photonic crystals induce flat-band Landau levels at discrete energies as well as chiral edge states. The high density of states and high degeneracy of the flat bands has implications for both on-chip and radiating light fields.

A frequency detuning between two pump lasers enables an exciton–polariton Floquet optical lattice and a polariton ‘conveyor belt’. The findings pave the way for Floquet engineering in polariton condensates.

Tailored light-matter interaction can be achieved with surface phonon polaritons (SPhPs). Here, Conrads et al. employ the plasmonic phase-change material In₃SbTe₂ on the polar crystal SiC for direct programming of confined SPhP resonators and study their resonance modes via near-field microscopy.

The advent of isolated attosecond XUV pulse sources marks a new era in attosecond science, pivotal for the investigation of core electron dynamics. Here the authors discover that the coherent Raman coupling between the cation states leads to extra timedelay between different transition channels by applying the attosecond transient absorption spectroscopy on the investigation of complex dynamics of strong field ionization of Krypton.

A metasurface consisting of merely four nanopillars at the wavelength scale is sufficient to generate a high-quality vortex beam.

T centers in silicon are promising candidates for quantum applications yet suffer from weak optical transitions. Here, by integrating with a silicon nanocavity, the authors demonstrate an enhancement of the photon emission rate for a single T center.

Photoemission experiments demonstrate that the photon number statistics of the exciting light can be imprinted on the emitted electrons, allowing the controlled generation of classical or non-classical electron number statistics of free electrons.

Band engineering in optics allows the design of unconventional forms of light with potential optoelectronic applications. Here, the authors realize slow-light intercavity polaritons in an array of coupled cavities, the photonic architecture enables the spatial segregation of photons and excitons

The authors demonstrate high-order terahertz nonlinear magnonics using two-dimensional coherent spectroscopy, revealing the emergence of seventh-order spin-wave mixing and sixth harmonic magnon generation within an antiferromagnetic orthoferrite.

Ultrafast light-induced driving of phonons at resonance in a substrate facilitates the permanent reversal of the magnetic state of a material mounted on it.

We introduce strong tailored light-wave-driven time-reversal symmetry breaking in monolayer hexagonal boron nitride, realizing a sub-laser-cycle controllable analogue of the topological model of Haldane and inducing non-resonant valley polarization.

Combining fluorescence correlation spectroscopy and ultrafast spectroscopy, the sample-averaged dynamics of defects are studied with single-particle sensitivity in two-dimensional hexagonal boron nitride heterogeneous emitters.

Here, the authors integrate monolayer MoSe₂ with a plasmonic nanocircuit and demonstrate the coherent selective routing of the enhanced nonlinear optical signal emitted by the 2D semiconductor, with routing extinction ratios up to 14.86 dB.

Here the authors demonstrate a strong interaction between the generated solitons and background light in a Brillouin-Kerr microcomb system. Based on this unique physical mechanism, they achieve a monostable single soliton microcomb and a turnkey single-soliton microcomb without employing any optical/electrical control or feedback.

The authors show an original approach to achieve strong light-matter interaction harnessing the coupling between plasmonic resonators and the Landau resonances of an underlying quantum well, demonstrating remarkably high coupling strengths.

A miniaturized optical frequency division system that could transfer the generation of microwaves, with superior spectral purity, to a complementary metal-oxide-semiconductor-compatible integrated photonic platform is demonstrated showing potential for large-volume, low-cost manufacturing for many applications.

Photonic Landau levels are demonstrated via a strain-induced pseudomagnetic field in a silicon photonic crystal slab.

Sea-based optical clocks combining a molecular iodine spectrometer, fibre frequency comb and electronics for monitoring and control demonstrate high precision in a smaller volume than active hydrogen masers.

The authors achieve enhanced cavity loading using complex-frequency excitations that can tailor on-demand the effective coupling rate in a microring resonator by precisely controlling the temporal evolution of the incident pulses.

Here the authors experimentally realized a systematic approach to synthesize arbitrary-size two-dimensional all-band-flat photonic lattices, which pave a route for investigating flat-band related physics such as slow-light, nonlinear breathing, and dispersionless image transmission.

All holographic displays and imaging techniques are fundamentally limited by the étendue supported by existing spatial light modulators. Here, the authors report on using artificial intelligence (AI) to learn an étendue expanding element that effectively increases étendue by two orders of magnitude.

Directional emission of photoluminescence is an emerging technique for light-emitting fields and nanophotonics. Here, the authors demonstrate a hydrogel grating with integrated quantum dots for switchable unidirectional emission tuning.

Time-resolved lightwave-driven scanning tunnelling spectroscopy is developed to investigate how the spin–orbit-split energy levels of a selenium vacancy within a WSe₂ monolayer shift under phonon displacement. Ultrafast snapshots of the electronic tunnelling spectra reveal transient energy shifts up to 40 meV.

Polymer thin films that emit and absorb circularly polarised light are promising in achieving important technological advances, but the origin of the large chiroptical effects in such films has remained elusive. Here the authors demonstrate that in non-aligned polymer thin films, large chiroptical effects are caused by magneto-electric coupling, not structural chirality as previously assumed.

An efficient way of realising a large number of telecom single-photon emitters for quantum communication is still missing. Here, the authors use a wide-field imaging technique for fast localization of single InAs/InP quantum dots, which are then integrated into circular Bragg grating cavities featuring high single-photon purity and indistinguishability.

Most applications of surface plasmons are based on their near-field properties. These properties are now shown to be governed by nonclassical scattering between multiparticle plasmonic subsystems.

Here, the authors report the generation and manipulation of transient hyperbolic plasmons in black phosphorus via ultrafast photocarrier injection, demonstrating a topological transition of the non-equilibrium iso-frequency contours and the coexistence of different transient plasmonic modes.

Here, the authors fabricate a metasurface with nanometre-sized plasmonic hotspots that interact coherently with WS₂ excitons, achieving ultrastrong exciton-plasmon coupling.

Optical recurrent neural networks present a unique challenge for photonic machine learning. Here, the authors experimentally show the first optoacoustic recurrent operator based on stimulated Brillouin scattering which may unlock a new class of optical neural networks with recurrent functionality.

This article presents a unique nanocomposite plasmonic-excitonic glass with extraordinary amplified optical properties: ultra-narrow photoluminescence (FWHM = 13 nm) and ultrashort photoluminescence lifetime (90 ps) at room temperature

Correlated insulator states of moire excitons in transition metal dichalcogenide heterostructures have attracted significant attention recently. Here the authors use time-resolved pump-probe spectroscopy to demonstrate the effects of non-equilibrium correlations of moire excitons in WSe₂/WS₂ heterobilayers.

Here the authors identify real-space contributions to the characteristics of high-harmonic generation in ReS2 and demonstrate the possibility of laser-controlled emission. They find that the spectrum is not just determined by the band structure, but also by the interference between HHG signals coming from different atoms within the unit cell.

Propagation losses have limited the practical use of polaritons in photonic applications. Here the authors demonstrate a substantial enhancement in the propagation distance of phonon polaritons, employing synthetic optical excitation of complex frequency with virtual gain synthesized by combining multiple real frequency measurements.

Quantum-correlated photons typically characterize strongly nonlinear quantum emitters. A two-photon correlation spectroscopy method now provides a powerful probe of weakly nonlinear many-body quantum systems.

Here, the authors perform Faraday rotation spectroscopy around the excitonic transitions in hBN-encapsulated WSe₂ and MoSe₂ monolayers, and interlayer excitons in MoS₂ bilayers. They measure a large Verdet constant - 1.9 × 10⁷ deg T⁻¹cm⁻¹ for monolayers, and attribute it to the giant oscillator strength and high g-factor of the excitons.

Interlayer excitons in 2D homo- and heterostructures have been intensively investigated due to their emerging optical properties. Here, the authors report the observation of interface excitons in 1D/2D carbon nanotube/WSe2 heterostructures, showing evidence of photon antibunching at room temperature.

An integrated device that combines optical parametric oscillation and electro-optic modulation in lithium niobate creates a flat-top frequency-comb-like output with low power requirements.

A microscale platform composed of a slanted nanograting is experimentally demonstrated to efficiently generate spatiotemporal optical vortex. This approach paves the way towards an integrated system for ultrafast pulse shaping.

Parity detection is essential in quantum error correction. Here, authors propose a reliable joint parity measurement (JPM) scheme inspired by stimulated emission and experimentally implement the weight-2(4) JPM scheme in a tunable coupling superconducting circuit, which shows comparable performance to the standard CNOT-gate based scheme.

The authors propose a nonlinear spoof plasmonic waveguide to realize coherent perfect absorption and parametric amplification at the same frequency, which opens a new route to actively modulate the electromagnetic waves with giant amplification-to-absorption contrast.

Mode locking, which is a common technique to produce short laser pulses, is demonstrated in a topological laser.

Intense light pulses can induce symmetry breaking, as for the generation of ferroelectricity in SrTiO₃. Using ultrafast X-ray diffuse scattering at a free-electron laser, nonlinear phonon interactions that occur on such mid-IR excitation are observed, with a theory for the dynamics presented.

The state of a single photon can be stored as a Rydberg excitation using electromagnetically induced transparency, and this enables nonlinear interactions at the single-photon level. Here, the authors store a paired photon emitted by a quantum memory in an ensemble-based, highly nonlinear medium.

Here the authors provide the experimental demonstration of a widely tunable integrated frequency comb source unlocking the spectrum from the visible to the mid-infrared in a thin-film lithium niobate platform.

Using gas cells for spectroscopic studies opens possibility for miniaturized platforms that can be integrated with other optical components. Here the authors demonstrate molecular rovibrational spectroscopy by confining molecules in a cell of subwavelength thickness.

Conformal transformation optics is exploited to design curved accelerating waveguides with spatially gradient curvatures to boost the nonlinear efficiency and broaden the bandwidth of the nonlinear optical processes in the waveguides.

Nonlinear epsilon-near-zero nanodevices are attractive solutions for large-scale integrated system-on-chips yet heat genearation upon operation affects their performance. Here, the authors studied the linear and nonlinear thermo-optic effects in the indium tin oxide, commonly used material for this system.