Spectral Invisibility Cloaking (image) The Optical Society Share Print E-Mail Caption A broadband wave illuminates an object, which reflects green light in the shown example, making the object detectable by an observer monitoring the wave. A spectral invisibility cloak transforms the blocked color (green) into other colors of the wave's spectrum. The wave propagates unaltered through the object, without 'seeing its color' and the cloak subsequently reverses the previous transformation, making the object invisible to the observer. Credit Luis Romero Cortés and José Azaña, Institut National de la Recherche Scientifique Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.