Seoul researchers develop programmable photonic chip that can slow light on demand

What Happened

Researchers at Seoul National University and the University of Seoul developed a programmable photonic integrated circuit that can slow light on demand. The report said the device is designed to control both the speed and shape of optical signals.

The work was led by Professors Namkyoo Park and Sunkyu Yu at Seoul National University, with Professor Xianji Piao at the University of Seoul. ScienceDaily said the approach offers more flexibility over “slow light” than previously proposed methods.

Why It Matters

The report said interest in optical computing is rising because generative AI and large-scale AI models are increasing the computing load on data centers and servers. Conventional electronic semiconductors are under pressure from energy use and data-transmission limits.

A programmable chip that can delay, synchronize, and buffer optical signals could reduce the number of separate devices needed in light-based systems. For operators, that points to potential gains in energy use, cost, and system complexity if the technology matures.

Key Details

The source describes the platform as a silicon nitride photonic integrated circuit, a low-loss and highly stable waveguide platform used in optical signal processing and integrated photonic devices.

• Coupled-resonator-induced transparency (CRIT) is the optical effect used to selectively transmit and delay light within a frequency range.
• Optical resonators confine or circulate light of a specific frequency and are used for delay, filtering, and modulation.
• Optical pulses are the basic units for transmitting information in optical communication and computing systems.
• Thermal crosstalk can affect neighboring components when heat in one part of a circuit changes device performance.

The report frames the chip as a building block for optical systems that need buffering and memory functions, which remain difficult because light naturally moves at a fixed speed.

What To Watch Next

For chemical buyers and lab managers supporting photonics-related work, the practical question is whether programmable optical functions can be integrated without adding excessive device count, heat management burden, or fabrication complexity.

For industrial operators and EHS teams, the key follow-on issue is whether future photonic systems can deliver the promised performance while maintaining stable operation on low-loss platforms such as silicon nitride and managing thermal crosstalk in dense circuits.