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,