Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
A chip-scale laser platform based on silicon nitride ring resonators and commercial Fabry–Pérot laser diodes is developed for the wavelength range from 404 nm to 785 nm. The achieved coarse and fine tunings are up to 12.5 nm and 33.9 GHz, respectively, with kilohertz-scale linewidths and side-mode suppression ratios above 35 dB.
The existence of the optical Berry phase in all-dielectric Möbius-strip cavities is experimentally confirmed. In contrast to a predicted sole Berry phase value of π, arbitrary values of the Berry phase upon adiabatic evolution of a linearly or elliptically polarized light wave are obtained.
A conversion of quantum information between single-photon and cat-state qubits is demonstrated by teleportation using optical hybrid entanglement. The classical limit of conversion is exceeded over the full Bloch sphere, with an average fidelity above 79%.
Bright upconversion of single nanocrystals is enabled by coupling to a single plasmonic nanocavity mode. An upconversion luminescence enhancement of ~105 was achieved. Single sub-30-nm nanocrystals provided 560 detected photons per second at an excitation intensity of just 0.45 W cm−2.
A nonlinear multi-pass cell is shown to be able to shift the central wavelength of a laser by tens of nanometres, offering a new means for control for high-power laser systems
A spatially multiplexed detection system of three transition-edge sensors is developed to resolve photon numbers up to 100 in a single laser pulse. Using the detector to measure parity of a coherent state allows for the extraction of quantum random numbers.
Up to 100 photons are resolved by a waveguide-integrated and hybrid spatiotemporal-multiplexed superconducting nanowire single-photon detector array. Using this detector array, photon statistical behaviour for a true thermal and a coherent light source is verified.
Compact laser-wakefield-driven X-ray sources show promise but suffer from poor conversion efficiency. New research demonstrates high-yield, hard X-rays generated by using carbon nanotube targets, instead of gases.
The addition of DDT to the spiro-OMeTAD hole transport material enhances the stability of perovskite solar cells to humidity, heat and illumination stress. Fabricated devices exhibit a champion certified power conversion efficiency of 23.1%. Also, the devices could retain 90% of the initial efficiency after 1,000 h of continuous illumination, 97% under moisture stress for 530 h and 91% under 144 h of heat stress.
A photodetector responding to only circularly polarized light is developed. It has a ring-shaped form, consisting of plasmonic nanostructures on a graphene sheet. Its zero-bias responsivity and detectivity of ellipticity in the mid-infrared at room temperature are 392 V W−1 and 0.03° Hz−1/2, respectively.
Circularly polarized light emitted from OLEDs exhibits opposite handedness depending on the propagation direction of the light. Switching the current flow in the OLED also switches the light handedness.
Researchers demonstrate a laser-plasma accelerator-driven free-electron laser in a seeded configuration, where control over the radiation wavelength and longitudinal coherence are achieved.
A multi-view reflector microscope based on polarization modulation and pupil splitting enables single-molecule orientation-localization microscopy with precisions of 10.9 nm and 2.0°.
The intrinsic Kerr nonlinearity in ring resonators is exploited to demonstrate passive isolation of a continuous-wave laser. Up to 35-dB isolation with 5-dB insertion loss was achieved on-chip.
Panuski et al. demonstrate a programmable photonic crystal cavity array, enabling the spatiotemporal control of a 64 resonator, two-dimensional spatial light modulator with nanosecond- and femtojoule-order switching.
It is shown that CsPbBr3 nanocrystals exhibit good radiation hardness for high γ-radiation doses, as high as 1 MGy. Electron trapping in surface defects limits scintillator applications, but is shown to be suppressed by surface fluorination treatment.
The accurate identification of the three-dimensional quantitative shape of a cell nucleus is now possible without fluorescent staining by applying computational segmentation to refractive index tomograms recorded in the flow cytometry mode.
A 1,024 pixel superconducting nanowire single-photon imager over a detection area of 403.2 μm × 403.2 μm is demonstrated by introducing an orthogonal time–amplitude-multiplexing method. The spatial resolution and average temporal resolution are 12.6 μm and 67.3 ps, respectively.