Researchers use zinc-doped CuInSe₂ nanocrystals as an alternative to lead chalcogenides for near-infrared upconversion. Upconversion to yellow with an external quantum efficiency reaching 16.7% is achieved, which can also be merged with photoredox catalysis for rapid solar synthesis.

A prototype integrated Ti:Sa laser is demonstrated by bonding the Ti:Sa gain medium on silicon nitride microring resonators. Lasing is demonstrated between 730 nm and 830 nm with a threshold power as low as 6.5 mW.

Photothermal relaxation localization microscopy allows super-resolution imaging of non-fluorescent targets by leveraging spatial-dependent heat dissipation in photothermal microscopy. Individual lipid droplets and their distribution in living cells are imaged at spatial resolutions down to 120 nm.

A hyperspectral camera based on a random array of CMOS-compatible Fabry–Pérot filters is demonstrated. The hyperspectral camera exhibits performance comparable with that of a typical RGB camera, with 45% sensitivity to visible light, a spatial resolution of 3 px for 3 dB contrast, and a frame rate of 32.3 fps at VGA resolution.

The combination of optical phase conjugation and light amplification enables wavefront shaping with simultaneously optimized operational speed, number of control degrees of freedom and energy of the focused wavefront. Shaping with a 10 μs latency time over about 10⁶ control modes and energy gain approaching unity is demonstrated.

Quantum recoil is experimentally observed via photon energy shifts in Smith–Purcell radiation. Leveraging van der Waals materials as atomic-scale gratings, the quantum recoil is measured at room temperature on a tabletop platform.

Recollected by his colleagues as a creative and humble scholar with an indomitable will, Byoungho Lee was enthusiastic about realizing the holistic potential of holographic displays.

Metalenz, a spin-out company from Harvard University founded in 2016, has launched its first metasurface-based product. Nature Photonics spoke with co-founder Federico Capasso about the company and its plans for flat optics.

George Palikaras, President and CEO of Meta Materials Inc., discusses the challenges of commercializing metamaterials, learned on the path from a small start-up to a Nasdaq-listed company.

Early research towards bulk metamaterials and exotic properties has been supplanted by work on thin metasurfaces ripe for commercialization, as outlined in this Focus issue.

Geoffroy Lerosey, co-founder and CEO/CSO of Greenerwave, shares how tunable metasurfaces may shake up industries from automotive to wireless communications.

The 2022 Nobel Prize in Physics celebrates the profound impact of quantum entanglement, which underpins many modern quantum technologies such as quantum cryptography and computing.