## Caltech’s tiny new chip can steer light in 74 quadrillionths of a second Light can transmit huge amounts of information at extraordinary speed, which is why photonic technologies are being explored for faster communications, more powerful computing, and highly sensitive sensors. To make those systems work, however, researchers need precise ways to control the direction of light and change it extremely quickly. Caltech researchers have now developed a device that uses one beam of light to redirect another in just 74 femtoseconds (74 quadrillionths of a second). That is roughly the amount of…