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In many disordered composite materials, such as paint, powders and biological tissue, light is scattered randomly and the directionality of the light is lost. In these disordered metamaterials, light normally performs a random walk and emerges as a random interference pattern known as speckle. Using continuous wave light with a perfectly matched wavefront, we make these disordered materials focus light as sharply as a lens. The matched wavefront is constructed using feedback from a detector in the target focus. By changing the incoming wavefront, we control the position and shape of the focus.
Date of Conference: 17-22 June 2007