1. King Abdullah University of Science and Technology (KAUST)KAUST Solar Center (KSC) Thuwal 23955 Saudi Arabia
2. School of Science and TechnologyNottingham Trent University NG11 8NS Nottingham UK
3. Ferdinand‐Braun‐InstitutLeibniz‐Institut für Höchstfrequenztechnik Gustav‐Kirchhoff‐Straße 4 12489 Berlin Germany
4. Department of PhysicsAristotle University of Thessaloniki GR‐54124 Thessaloniki Greece