  Controlling the flow of excitons between organic molecules holds immense
promise for various applications, including energy conversion, spectroscopy,
photocatalysis, sensing, and microscopy. DNA nanotechnology has shown promise
in achieving this control by using synthetic DNA as a platform for positioning
and, very recently, for also orienting organic dyes. In this study, the
orientation of doubly-linked dyes in DNA origami structures was manipulated to
control energy transfer. By controlling independently the orientation of single
donor and acceptor molecules, the average energy transfer efficiency was
doubled. This work demonstrates the potential of DNA nanotechnology for precise
control of the excitonic energy transfer with implications for artificial
light-harvesting antennas.
