(A) SEM image of Yagi-Uda antenna (I), scanning confocal image of quantum dot emission (II), and corresponding intensity distribution at the back focal plane of an objective (III). Adapted from ref. 10 with permission from AAAS. (B) SEM image of BE antenna (I), back focal plane image of coupled emission from Alexa647 (II), and corresponding angular radiation pattern (III). Adapted with permission from ref. 9. Copyright {2011} American Chemical Society. (C) SEM image of slit antenna with side grooves (I), and scanning confocal image of quantum dot emission. Adapted from ref. 20 by permission from Macmillan Publishers, Copyright (2011). (D) SEM image of plasmonic lattice antenna (I), and back focal plane image of emission from Alexa647. Adapted with permission from ref. 21. Copyright {2013} American Chemical Society.