1. CHOSE, Department of Electronic Engineering, Università degli Studi di Roma Tor Vergata, Via del Politecnico 1, Rome 00133, Italy
2. LASE−Laboratory for Advanced Solar Energy, National University of Science and Technology MISiS, Moscow 119049, Russia
3. Institute for Structure of Matter, National Research Council (CNR-ISM), via del Fosso del Cavaliere 100, Rome 00133, Italy