Figure 4From: Conditionally activating optical contrast agent with enhanced sensitivity via gold nanoparticle plasmon energy transfer: feasibility study Theoretically estimated fluorescence level of Cypate (Ex/Em, 780/830Â nm) relative the fluorescence without the influence of GNP-SPF, with change in the distance from a GNP at sizes 5, 10, 15, and 30Â nm. Back to article page