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Ammonium bromide is shown to passivate deep traps on FAPbBr3 surfaces, improving the charge collection efficiency to near unity in perovskite gamma-ray devices. The approach yielded tenfold improvements in dark current, and the energy resolution of 137Cs spectra acquired using FAPbBr3 detectors was improved from 5.7% to 1.7%.
Controlling the intrinsic doping of lead-free perovskites enables near-infrared LEDs emitting at 948 nm with a peak radiance of 226 W sr–1 m–2 and a half-lifetime of 39.5 h.
Exploiting the signal correlation between multiple quantum sensors enables measuring overlapping signals from multiple targets, as demonstrated by imaging point defects in a diamond with an accuracy of 1.7 nm.
A terahertz focal-plane array based on a two-dimensional array of plasmonic photoconductive nanoantennas offers high-quality imaging in the terahertz region.
Electrically injected charges can effectively contribute to optical gain in perovskite light-emitting diodes under optical and electrical co-excitation.
Dipole–dipole interactions in mixed-phase CdZnSeS quantum dots enable the effective orientation of the quantum dots and improved photon out-coupling when employed in a light emitting diode.
Silver telluride quantum dots are employed in shortwave-infrared photodetectors and in monolithically integrated imagers that are free from toxic heavy metals and fully solution processable.
A new form of chirped amplification with two different nonlinear crystals can generate high-energy, single-cycle laser pulses with terawatt-level peak powers.
Bias-free optical metasurfaces with a large non-reciprocal response for free-space radiation are discussed, based on thermo-optic nonlinearities. These ultrathin devices may lead to new approaches for areas ranging from signal processing to protection of high-power laser cavities.
Wavelength-scale, low-threshold, vortex and anti-vortex nanolasers with topological charges in an optical cavity that is formed by a topological disclination are demonstrated, paving a way towards the development of ultra-small light sources with quantized vector vortex states attractive for optical communication systems.
Programmable photonic arrays with <10 fW (per unit) standby power consumption, <40 pJ (per unit) reconfiguration energy and <11 V programming voltages are demonstrated.
Self-configuring meshes of integrated Mach–Zehnder interferometers determine the optimal communication channels through unknown optical media, with the resulting modes showing crosstalk below –30 dB.
An electrically tunable device that can work as an optical switch, an optical limiter with a tunable limiting threshold and a nonlinear optical isolator with a tunable operating range in the mid-infrared range is realized by combining a gold layer with subwavelength square slits and a layer of VO2.
Researchers demonstrate nonlinear wavelength converters whose output wavelengths are controlled with high accuracy by bandgap-protected wavenumber selectivity. Output frequencies are continuously tuned by nearly 300 GHz without compromising efficiency.
By implanting 117Sn, a fibre-packaged nanophotonic diamond waveguide with optically addressable hyperfine transitions separated by 452 MHz is demonstrated. This enables the formation of a spin-gated optical switch and achieving a waveguide-to-fibre extraction efficiency of 57%.
Researchers propose a laser pulse compression method for exawatt to zettawatt lasers based on spatially varying dispersion of an inhomogeneous plasma. This may enable, for example, pulse compression of a laser pulse from 2.35 ps to 10.3 fs. The approach is robust at high intensities.
Three-dimensional nonlinear optical metamaterials are realized by directly engineering the symmetries of electronic wavefunctions at the atomic scale by stacking individual two-dimensional van der Waals interfaces into a precisely designed three-dimensional configuration.
A mid-infrared dual-comb system capable of nanosecond time-resolved spectral measurements is realized by using a singly resonant optical parametric oscillator that allows an efficient conversion of an input dual-comb pump at 1 µm into an idler dual comb in the mid-infrared regime.