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A research team led by École Polytechnique has demonstrated the world’s first all‑optical photonic time crystal (PTC), a material that can dynamically reshape terahertz light on picosecond time scales. By creating a repeating pattern in time rather than space, the PTC opens a new dimension for light control, enabling ultrafast amplification, lasing and potentially terahertz‑range optical computers. The breakthrough relied on the high‑field, phase‑stable terahertz pulses from HZDR’s TELBE source and achieved dynamic modulation of reflectivity and resonance frequencies at speeds comparable to light’s own oscillations.
Parallel to this fundamental advance, optical‑computing startup Neurophos announced a $110 million Series A round to accelerate its photonic AI chips. Leveraging metamaterial‑based modulators that are 10,000 times smaller than conventional devices, Neurophos can pack a million modulators onto a fingernail‑sized chip. This architecture delivers instantaneous, light‑speed calculations—56 GHz clocking and 56 billion operations per second—while consuming far less power than GPUs, achieving up to 25× higher operation‑per‑watt performance.
Why it matters: The PTC provides a platform for ultrafast, low‑loss terahertz manipulation, a key stepping stone toward optical processors that could bypass electronic bottlenecks. Neurophos’s scaling of optical compute units (OCUs) shows a viable path to replace energy‑hungry GPUs in data‑center AI workloads, promising dramatic energy savings and higher compute density.
What to watch next: Researchers aim to further reduce photon dissipation in the PTC and explore its use for tunable terahertz lasers and adaptive communications. In the commercial realm, Neurophos plans to demonstrate full‑system AI inference on its meta‑surface chips and target deployment of OCUs by 2028, with a market projected to reach billions of dollars within the next decade. [[1, 2]]