Figure 1
(a) Schematic of the polydimethylsiloxane (PDMS)-based nanofluidic trapping device with integrated pockets and supporting pillars. The nanofluidic channels had a width of w c=10 μm. Two device geometries G 1 (h c=210 nm, h p=70 nm) and G 2 (h c=160 nm, h p=100 nm) were used for trapping gold nanoparticles. The width w p of the pockets varied in both device geometries from 200 to 500 nm. (b) Schematics and corresponding experimental optical iSCAT images of d=60, 80 and 100 nm gold particles trapped in circular pockets with a diameter of w p=250 nm in G 2 devices. Scale bars: 2 μm.
