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This systematic study of upconversion nanoparticles reveals power-dependent luminescence and paves the way towards ideal single-molecule and cellular probes.
A three-dimensional nonlinear photonic crystal in ferroelectric barium calcium titanate that enables phase matching of nonlinear processes along an arbitrary direction, thereby removing constraints imposed by low-dimensional structures, is experimentally realized.
A metalens is integrated into the design of an endoscopic optical coherence tomography catheter to achieve near-diffraction-limited imaging free of non-chromatic aberrations, offering high-resolution imaging well beyond the Rayleigh range of the input field.
Nanocrystals assembled into metal–insulator–metal junctions can boost the efficiency of light generation from enhanced inelastic tunnelling to ~2%, which is a two orders of magnitude improvement over previous work, paving the way to on-chip ultrafast and ultracompact light sources.
By seeding a non-resonant aluminium-gallium-arsenide-on-insulator nanowaveguide with 10-GHz picosecond pulses at a low pump power of 85 mW, a single energy-efficient frequency comb source carrying 661 Tbit s–1 of data, equivalent to more than the total Internet traffic today, is achieved.
The observation of spin-dependent lateral displacements of anisotropic and inhomogeneous media with the naked eye is reported, allowing structured light–matter interaction to move from a scientific curiosity to a new asset for the optical manipulation toolbox.
A nonlinear charge oscillation driven by a 6 fs light field of 11 MV cm–1 is observed in a layered organic superconductor. The initial response time of the oscillation on the timescale of 10 fs clarifies that Coulomb repulsion is essential for the superconductivity.
Using high-temperature gas mixtures as the generation medium to increase the translational velocity of Xe atoms through the focus of a femtosecond enhancement cavity, phase-matched extreme-ultraviolet emission at a repetition rate of 77 MHz and with an average power of ~ 2 mW in a single harmonic order is achieved.
Near-infrared femtosecond laser pulses are sent to a Si or ZnO crystal to generate high-harmonic waves via static or transient field-induced optical nonlinearities. The beam profile of the high-harmonic emission is controlled by electronic methods.
Highly crystalline BaTiS3 has been shown to exhibit record-breaking birefringence of 0.76 in the wavelength range of 7–16 μm. The large anisotropy is a result of its quasi-one-dimensional structure.
A scheme for generating intense single-cycle pulses in the 5–14 μm wavelength range is proposed. The generation mechanism is described by photon frequency downshifting of an off-the-shelf Ti:sapphire laser in a tailored plasma density structure.
Previous predictions that light radiated by modes around a bound state in the continuum (BIC) condition should exhibit a vortex in the far-field polarization profile are experimentally confirmed. The findings shed light on the origin of BICs.
While modifications of emission and absorption rates are commonplace in photonics, similar manipulations of emitter transition frequencies are challenging. Here, 2D polaritons in graphene are predicted to enable non-vertical electronic transitions in a quantum well, controlling the transition frequencies by inducing an effective non-locality.
Eigenmodes of photonic crystal defects have now been topologically protected in an experimental demonstration that also shows how to minimize the mode volume.
Third-harmonic generation and four-wave mixing of light can be enhanced in graphene with gate tuning to adjust the doping level. The findings may lead to new graphene-based nonlinear optoelectronic devices.
The combination of a spatial light modulator at the fibre input, real-time spectral feedback and a genetic algorithm optimization controls the nonlinear stimulated Raman scattering cascade and its interplay with four-wave mixing in multimode fibres.
A microcavity exciton–polariton system based on aligned and packed single-walled carbon nanotubes exhibits ultrastrong coupling. The coupling strength is polarization sensitive. The record high value of vacuum Rabi splitting, 329 meV, is reported.
Surface treatment is shown to yield passivated perovskite films with very high quasi-Fermi level splitting and internal photoluminescence quantum efficiency, indicating that further improvements in the performance of perovskite optoelectronics should be feasible.