Plasmonic heterostructure for dark exciton control. Credit: Jiamin Quan A research group at the City University of New York and the University of Texas at Austin has found a method to make dark excitons, a class of previously unseen light states, emit bright light and be controlled with nanoscale precision. The study, published November 12 in Nature Photonics , points toward future technologies that could operate faster, use less energy, and shrink to even smaller sizes. Dark excitons form in