image: This is a photograph of the angular selective sample. The sample is the rectangular area where the beam is projected. The white beam is incident at an angle inside the transmission angular window, and propagates through the sample as if the sample is a transparent glass. On the other hand, the white lines that only exists on the sample are the reflected images of the incident beams (so from the angle of the camera the sample looks like a mirror). 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