A colloidal particle driven across a temporally oscillating periodic landscape displays mode locking
News from Sep 19, 2019
A colloidal particle is driven across a temporally oscillating one-dimensional optical potential energy landscape and its particle motion is analysed. Different modes of dynamic mode locking are observed experimentally and explained theoretically.The effect of the oscillation frequency on the mode locked step width is addressed and the results are discussed in light of a high-frequency theory and compared to simulations. Stronger coupling between the particle and the landscape is seen to increase the width of mode locked steps. Finally, transport across the temporally oscillating landscape is studied by measuring the effective diffusion coefficient of a mobile particle, which is seen to be highly sensitive to the driving velocity and mode locking.
Transport of a colloidal particle driven across a temporally oscillating optical potential energy landscape, J.L. Abbott, A.V. Straube, D.G.A.L. Aarts, R.P.A. Dullens, New J. Phys. 21, 083027 (2019)