Fig. 1
From: Planar metasurface-based concentrators for solar energy harvest: from theory to engineering
(a) Energy budget of the solar energy that is incident on the Earth’s surface (from NASA sources). (b) Schematic of different concentrating solar systems: (I) Parabolic trough solar collector; (II) Linear Fresnel reflector; (III) Parabolic dish; (IV) Solar tower. (c) c(I) Solar field of SENERtrough® cylindrical-parabolic collectors. Aerosol and Termesol thermosolar plants, owned by Torresol Energy. c(II) Gemasolar thermosolar plant, owned by Torresol Energy and developed by SENER. Tracking mechanisms for parabolic trough solar collector: (d) East-west tracking and (e) north-south tracking. (a) Reproduced with permission [13]. Copyright 2013, Elsevier. (b) Reproduced with permission [14]. Copyright 2012, Royal Society of Chemistry. (c) Reproduced with permission [15]. Copyright 2017, Elsevier. (d) Reproduced with permission [16]. Copyright 2017, Elsevier. (e) Reproduced with permission [17]. Copyright 2011, Elsevier