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(a) Fabrication schematics of graphene/vertically aligned carbon nanotube (CNT) hybrid structure on quartz; (b) a 3D image of CNT heights obtained from optical surface profiler; (c) scanning electron microscopy (SEM) images of graphene/vertically aligned CNTs on quartz substrates. The inset shows a digital photographic image of our optical element. Reprinted with permission from [16]. Copyright 2011, John Wiley and Sons. VACNT, vertically aligned CNT.
