The Sapienza Terahertz group of Prof. Stefano Lupi is located at the Department of Physics University La Sapienza, Rome, Italy.The interests of the group are focused on the exotic low-energy excitations in condensed matter physics, ranging from Dirac electrons in Topological Insulators and graphene to High-Tc superconductors, plasmonics and metamaterials, the development of new sources and new instrumentations for IR and THz spectroscopy, and IR and THz investigations in biophysics and condensed matter.