Phys.org June 28, 2018
Most current cloaking devices can fully conceal the object of interest only when the object is illuminated with just one color of light. Researchers in Canada propose a new conceptual approach enabling the realization of full-field broadband invisibility. This involves a customized and reversible redistribution of the illumination frequency content, allowing the wave to propagate through the object of interest while preventing any interaction between the wave and the object. They demonstrated the concealment of a broadband optical filter from detection with a phase-coherent light pulse of 500 GHz bandwidth, showing full restoration of the complex temporal and spectral profiles of the pulse. The approach could be applicable to securing data transmitted over fiber optic lines and help improve technologies for sensing, telecommunications and information processing… read more. Open Access TECHNICAL ARTICLE
A broadband wave illuminates an object making the object detectable by an observer monitoring the wave. Credit: Luis Romero Cortés and José Azaña, Institut National de la Recherche Scientifique