The scattering of light was long thought to prevent imaging through opaque materials. However, scattering from static objects is deterministic, and in the last 15 years, a series of pioneering studies have shown us that it is possible to use a technique called wavefront shaping to characterise and subsequently cancel out complicated scattering effects. Light that has undergone multiple scattering can be ‘untangled’ to see through opaque media, such as frosted glass, biological tissue, or multimode optical fibres.
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