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Using analytical techniques and Langevin dynamics simulations, we investigatethe dynamics of polymer translocation through a nanochannel embedded in twodimensions under an applied external field. We examine the translocation timefor various ratio of the channel length $L$ to the polymer length $N$. Forshort channels $L\ll N$, the translocation time $\tau \sim N^{1+\nu}$ underweak driving force $F$, while $\tau\sim F^{-1}L$ for long channels $L\gg N$,independent of the chain length $N$. Moreover, we observe a minimum oftranslocation time as a function of $L/N$ for different driving forces andchannel widths. These results are interpreted by the waiting time of a singlesegment.

Driven polymer translocation through a cylindrical nanochannel: Interplay between the channel length and the chain length