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The motion of an optically trapped sphere constrained by the vicinity of awall is investigated at times where hydrodynamic memory is significant. First,we quantify, in bulk, the influence of confinement arising from the trappingpotential on the sphere's velocity autocorrelation function $C(t)$. Next, westudy the splitting of $C(t)$ into $C_\parallel(t)$ and $C_\perp(t)$, when thesphere is approached towards a surface. Thereby, we monitor the crossover froma slow $t^{-3/2}$ long-time tail, away from the wall, to a faster $t^{-5/2}$decay, due to the subtle interplay between hydrodynamic backflow and walleffects. Finally, we discuss the resulting asymmetric time-dependent diffusioncoefficients.

Anisotropic memory effects in confined colloidal diffusion