Figure 4.

(A) Illustration showing gold nanopyramidal dimers and DNA molecules being trapped in plasmonic traps (red areas). (B) Fluorescence micrographs showing assembly of λ-DNA molecules stained with YOYO-1 in the area of the plasmonic substrate irradiated with the femtosecond (fs) laser (dashed white circle). As the fs laser is turned on, the irradiated area becomes brighter and brighter over time as an increasing number of molecules are trapped. When the laser is turned off the molecules go back in solution. Adapted with permission from [75]. Copyright 2013 American Chemical Society.