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Zero-Index Platforms: Where Light Defies Geometry

Geometry-invariant effects in structures with near-zero permittivity or permeability could lead to deformable optical devices, and to new insights into unique light-matter interactions. Light and electromagnetic fields can propagate in vacuum at the maximal speed achievable—the speed of light. This characteristic, while invaluable for fast, long-range communications systems, also raises challenges for control and manipulation,