The blue argon lines were absent, but my examination was not sufficiently detailed to allow me to say, that the visible lines were those commonly found in the “red spectrum.” Neither with nor ...

Meta-lens works in the visible spectrum, sees smaller than a wavelength of light High efficiency ultra-thin planar lens could replace heavy, bulky lenses in smart phones, cameras and telescopes ...

Although this range is still officially known as the 'visible spectrum', the advent of lasers with very specific infrared wavelengths brought reports that people were seeing laser light with ...