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. Author manuscript; available in PMC: 2017 Jun 14.
Published in final edited form as: Anal Chem. 2017 Jan 19;89(3):1972–1977. doi: 10.1021/acs.analchem.6b04500

Figure 4.

Figure 4

(a) Ion-current measurements for melittin ions in the straight (blue) and elevator (red) modes as a function of the voltage difference between the two orifices in elevator surface (see Figure 1). Ion currents of ~350 pA were measured at the device entrance. (b) Top panel shows trajectories at ΔV = 0 V (i.e., straight mode), middle panel at ΔV = −2 V showing 66% transmission through the elevator, and the bottom panel shows the ion trajectories at ΔV = −4 V and 100% transmission through the elevator. Simulations were performed with 250 particles using rf parameters of 150 Vp-p at 1 MHz.