An international team of researchers from École Polytechnique, Collège de France and Helmholtz-Zentrum Dresden-Rossendorf (HZDR) has achieved a world first: the experimental realization of an all-optical photonic time crystal (PTC), a material whose optical properties can be strongly and periodic...
Source: [Phys.org](https://phys.org/news/2026-07-photonic-crystals-ultrafast-terahertz-range.html)