Fig. 1: GIE trapping in nanostructures.
From: Surface-modified elastomeric nanofluidic devices for single nanoparticle trapping

Nanoparticle trapping in various nano- and microstructures imbedded in nanochannels. The depths of nano/microindentations are 80 nm in the case of the Unibasel, PSI and SNI logos and 100 nm in the case of the grid; the channel height is 160 nm