Professor Tetsu Tatsuma and graduate student Koichiro Saito, Institute of Industrial Science, University of Tokyo developed thin films that exhibit different colors on the front side and back side. This unique effect is based on light scattering from plasmonic metal nanoparticles. The films would be applied to security printing and advanced coloring materials.

Related Movies http://pubs.acs.org/doi/suppl/10.1021/acsphotonics.6b00547

Journal Title : ACS Photonics
Article Title : Control of Asymmetric Scattering Behavior of Plasmonic Nanoparticle Ensembles
Author(s) : Koichiro Saito and Tetsu Tatsuma
DOI: 10.1021/acsphotonics.6b00547
Abstract URL : http://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00547