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We computationally investigate the active transport of tangentially-drivenpolymers with varying degrees of flexibility and activity in two-dimensionalsquare lattices of obstacles. Tight periodic confinement induces notableconformational changes and distinct modes of transport for flexible and stiffactive filaments. It leads to localization and caging of flexible polymersinside the inter-obstacle pores, while promoting more elongated conformationsand enhanced diffusion for stiff polymers at low to moderate activity levels.The migration of flexible active polymers occurs via hopping events, where theyunfold to move from one cage to another. In contrast, stiff chains travelmainly in straight paths within inter-obstacle channels, while occasionallychanging their direction of motion. Both the duration of caging and persistentdirected migration within the channels decrease with increasing the activitylevel. As a consequence, at high active forces polymers overcome confinementeffects and transport within inter-obstacle pores as swiftly as those in freespace. We explain the center of mass dynamics of semiflexible polymers in termsof active force and obstacle packing fraction by developing an approximateanalytical theory.

Active motion of tangentially-driven polymers in periodic array of obstacles