Revolutionizing Photonic Circuits with Lithography-Free Reprogramming.

Researchers at the University of Pennsylvania have created a photonic circuit using a slab of InGaAsP and a laser pattern projection, without the need for lithography. While not the first of its kind, this approach may offer more versatility. In 2017, researchers used vanadium dioxide (VO2) to create photonic devices with μm-sized features. The development of fully photonic processors for computers and machine learning applications is still a long way off.