Figure 1

From: Soft electrostatic trapping in nanofluidics

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 wc=10 μm. Two device geometries G1 (hc=210 nm, hp=70 nm) and G2 (hc=160 nm, hp=100 nm) were used for trapping gold nanoparticles. The width wp 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 wp=250 nm in G2 devices. Scale bars: 2 μm.