Scientists Built a Programmable Chip That Can Slow Light on Command

Light travels fast, almost too fast. And for the next generation of AI servers and optical computers, that's actually a problem.

Researchers from Seoul National University and the University of Seoul have built a programmable photonic chip that can slow, delay, and reshape light signals on demand, something conventional optical hardware simply cannot do.

The key innovation: treating two optical interference states as a single, unified design parameter, then adding two adjustable loop couplers. The result is a chip that can be reconfigured after it's built, rather than being locked into fixed behavior from the moment it leaves the factory.

Professor Namkyoo Park described the work as "a new design principle that allows the flow of light within photonic integrated circuits to be reconfigured as needed, greatly enhancing design flexibility."

One chip could potentially replace multiple components in data centers and AI servers, cutting energy use while handling signal timing, frequency switching, and optical buffering, all at once.