New mechanism for channeling of light discovered The discovery opens up new possibilities for integrated photonics, optical signal transmission on chips and future quantum technologies. The two neighboring nanoantennas illustrate elliptical (foreground) and hyperbolic (background) propagation of the optical waves. Light behaves similarly: when emitted from a localized source, it naturally propagates as spherical or circular wavefronts within a material. By placing a nanoscale gold antenna on the surface and illuminating it with infrared laser light, they generated highly confined optical waves that propagated exclusively along a single direction. Instead, its intrinsic crystal properties determine the direction of light propagation.