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École Polytechnique

École Polytechnique

University and research institute

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Scientists build first all-optical photonic time crystal

New Capabilities

Led the material design and physics

For decades, engineers shaped light by building patterns into space: layered mirrors, etched crystals, fiber cores. A team from France and Germany just did it in time instead. They flipped a material's optical properties on and off billions of times faster than any electronic switch.

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