Introduction: A Terahertz Gap Gets Narrower Researchers at Lawrence Livermore National Laboratory (LLNL) are advancing a promising solution to the long-standing terahertz (THz) gap that hampers next-generation telecommunications. By designing, optimizing, and 3D-printing helical structures, LLNL scientists are crafting optical materials that can manipulate THz waves with unprecedented control. This approach could unlock faster data…