A Cornell-led team made conductive aluminum gallium oxide films with bandgaps above 7 eV on sapphire, beyond cubic boron nitride. A diode and a transistor work, but the devices are still proofs of concept.
A silicon-nitride chip performs a convolution on light itself, then recovers the spectrum with an FFT. The Nature Photonics paper reports lab-grade precision at about $10. Glucose tracking is still one participant deep.
POSTECH's polarization-multiplexed silicon nitride metalens and liquid-crystal cell switch between two foci in about 250 ms. The paired foci give 1.2 mm of axial coverage with no moving optics.
