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Materials for optics are substances used to manipulate the flow of light. This can include reflecting, absorbing, focusing or splitting an optical beam. The efficiency of a specific material at each task is strongly wavelength dependent, thus a full understanding of the interaction between light and matter is vital.
The authors demonstrate how flexible metasurfaces powered by artificial neural network can dynamically manipulate the EM scattering behavior from an arbitrary surface - an ultimate ambition for many EM stealth and communication problems.
Here Wang et al. demonstrate the fabrication of GaN micro-light emitting diodes with a low rate of efficiency decrease in low current density regions, these features are strongly desired for augmented-reality glass applications.
A superlattice structure in Eu-doped GaN is known to improve the power output of red LEDs, though the mechanism behind this needs to be further established. Here, terahertz emission spectroscopy is used to understand the role played by potential barriers and carrier confinement in determining power output.
Optically stimulated vibrational control for materials has the potential to improve the performance of optoelectronic devices. The vibrational control of FAPbBr3 perovskite solar cells has been demonstrated, where the fast dynamics of coupling between cations and inorganic sublattice may suppress non-radiative recombinations in perovskites, leading to reduced voltage losses.
Organic π-conjugated radicals have recently joined the ranks of high-efficiency light-emitting materials, however, their light-emission mechanism is still a matter of debate. Here, the authors highlight a recently proposed luminescent enhancement mechanism and record-breaking efficiency of a radical organic light-emitting diode.
New conductive and perovskite inks enable hand-drawing of optoelectronic devices with a ballpoint pen on a variety of daily substrates, including paper, textiles and other irregular surfaces.
Chiral single-photon emitters are desirable, versatile tools for quantum information processing. Exploiting proximity to a strain-induced local magnetic field in the van der Waals antiferromagnet NiPS3 enables the emission of high-purity chiral single photons from monolayer WSe2 at zero external magnetic field.
An article in Nature Materials shows that a ‘quantum dot molecule’ — two fused and electronically coupled quantum dots — can easily switch between two distinct emission colours when induced by an electric field.
An article in Nature Communications uses an artificial-intelligence-guided robot to accelerate the discovery and fabrication of chiroptically active films.
