Light particles pass through the outer layer, freeing a cascade of electrons through the material. (discovermagazine.com)
For example, if two mirrors are placed extremely close together, the kinds of virtual light particles, or photons, that can exist between them can be limited. (scientificamerican.com)
A team of researchers has built an array of light detectors sensitive enough to register the arrival of individual light particles, or photons, and mounted them on a silicon optical chip. (sciencedaily.com)