image: This is a photograph of the angular selective sample. The sample is marked by the white rectangular frame. The white beam propagates through the sample as if the sample is a transparent glass. The red beam incident at a different angle is reflected as if the sample is a mirror. The three additional lines that only exist on the sample are the reflection images of the incident and reflected beams. The whole setup is immersed in the liquid filled with light-scattering nanoparticles so that the researchers can trace the ray. This image relates to a paper that appeared in the Mar. 28, 2014, issue of Science, published by AAAS. The paper, by Yichen Shen at Massachusetts Institute of Technology in Cambridge, Mass., and colleagues was titled, 'Optical Broadband Angular Selectivity.' view more
Credit: Image courtesy of Weishun Xu and Yuhao Zhang