‘Optical magic’: New flat glass enables optimal visual quality for augmented reality goggles
... The paper was published online August 8, 2022, by Light: Science & Applications. ...
Nonlocal metasurfaces
Yu's team invented a "nonlocal metasurface" that can manipulate light waves in distinct ways at distinct targeted wavelengths, while leaving light at untargeted wavelengths unaffected. The new devices exert both spatial and spectral control over light by selecting a color (spectral) and focusing it (spatial) not just at a single wavelength but also independently at multiple different wavelengths.
For example, one demonstrated device functions both as a converging lens that focuses light at one color, and as a concave lens that disperses light at a second color, while staying transparent, like an unpatterned slab of glass, when illuminated with light at colors over the rest of the spectrum. ...
See the full story here: https://phys.org/news/2022-09-optical-magic-flat-glass-enables.html
