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A tilted plasmonic nanocavity enables shortening of the luminescence decay time of a rare-earth-doped nanoparticle to sub-50 ns. High quantum efficiency enhancement, chiral polarization and directional far-field emission are maintained.
An array of 87Rb atoms with inter-atomic distances of 1.5 μm is prepared by holographic optical tweezers. When a pair of nearby 87Rb atoms is optically excited to a Rydberg state, the energy exchange between the atoms is observed on a timescale of nanoseconds.
Lanthanide nanotransducers are developed to detect broadband incoherent mid-infrared radiation in the 4–11 μm spectral window by ratiometric luminescence measurements.
Microwave-driven holonomic quantum gates on an optically selected electron spin in a nitrogen-vacancy centre in diamond are demonstrated. Optically addressable entanglement is generated between the electron and adjacent nitrogen nuclear spin.
A superradiant photonic engine is developed by using a 138Ba atomic beam and a high-finesse optical cavity. The mirrors of a Fabry–Pérot cavity act as the piston of an engine. The achieved engine temperature and efficiency are 1.5 × 105 K and 98%, respectively.
Efficient perovskite–silicon tandem solar cells with an efficiency of up to 28.6% are reported by employing tribromide ions to reduce charge recombination.
X-ray detectors based on dual-site-doped perovskite single crystals exhibit excellent sensitivity of 2.6 × 104 μC Gyair−1 cm–2 under a low field of 1 V cm–1. The detectable dose rate is as low as 7.09 nGyair s–1. The operational stability is beyond half a year.
An analogous all-optical Stern–Gerlach experiment is observed in nonlinear optics, where the frequency of light acts as a pseudospin. The deflection depends on the strength of the nonlinear coupling gradient as well as on the relative phase between the different input frequencies.
Researchers demonstrate a self-calibrating programmable photonic integrated circuit. The findings may be useful for the accurate control of large-scale photonic integrated circuits in applications such as light-based machine learning.
Researchers demonstrate an integrated mirror-symmetric non-reciprocal device enabled by three coupled photonic resonators. Nearly 40 dB of isolation is achieved at telecommunications wavelengths using 75 mW of radiofrequency power.
Linearly polarized orbital angular momentum-carrying hard X-ray beams are induced using spiral Fresnel zone plates. By sending the hard X-ray beams to disordered enantiopure molecular complexes, the helicity-dependent and chiral-sensitive signal is obtained.
Strained NbOI2 flakes with a thickness of 20 nm exhibit a record SHG absolute conversion efficiency of >0.2% and an effective bulk-like nonlinear susceptibility of 1.1 × 10−9 m V−1 at the fundamental wavelength of 1,050 nm. The spatial profile of the polarized second-harmonic generation response can be tuned by the fundamental wavelength.
Tunable sub-megahertz spectral features are demonstrated without resonators. The approach, which exploits gain-enhanced polarization pulling in a twisted birefringent medium, may be useful in applications such as microwave photonic filters, slow and fast light, and optical sensing.
Researchers demonstrate a persistent spin helix in an organic–inorganic hybrid ferroelectric halide perovskite whose layered nature makes it intrinsically like a quantum well. They demonstrate a switchable spin-polarized band structure via an intrinsic ferroelectric field.
Researchers demonstrate systems in which optical solitons coexist and interact with topological solitonic structures localized in the molecular alignment field of a soft birefringent medium. The findings could lead to solitonic tractor beams and new light–matter self-patterning phenomena.