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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.
Advances in the understanding of optical skyrmions, within a unified topological framework, are reviewed. The field structure of such optical quasiparticles, and their topological characteristics, may be useful for fields ranging from imaging to quantum technologies.
The progress made in developing light-emitting technologies that are wearable, attachable or implantable is reviewed and potential applications and challenges are discussed.
A new form of chirped amplification with two different nonlinear crystals can generate high-energy, single-cycle laser pulses with terawatt-level peak powers.
A coherent microwave-to-optical conversion scheme, previously feasible only under cryogenic environments, has now been expanded to ambient conditions by using Rydberg atoms.
Modelling shows how plasma density gradients can be tailored to compress optical pulses in the final stages of laser systems towards exawatt (1018 W) peak powers.
A large-angle twist between two bilayer graphene films makes a sensitive and broadband infrared–terahertz detector as a result of interlayer screening and a crystal field-induced bandgap.
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.
This Review covers a comparison between various label-free biomedical imaging techniques, their advantages over label-based methods and relevant applications.
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.
Photonic processors are promising candidates for solving tough mathematical problems. Nature Photonics asked Yoshihisa Yamamoto, director of the Physics and Informatics Laboratories at NTT Research in USA, about the progress that is being made in realizing coherent Ising machines (CIMs).