Observation of Colloidal Particle Dynamics Near a Flat Wall by UsingOscillating Optical Tweezers

摘要

We study the hydrodynamics of a micron-sized spherical particle positioned nearby a flat wall by using oscillating optical tweezers that trap and oscillate the colloidal particle. In this situation, the presence of the flat wall complicates the flow field surrounding the particle, so the force felt by the moving particle is quite different from the three dimensional hydrodynamics drag force, known as Stokes' drag. However, in biological processes, this condition is ubiquitous and governs the biological particle hydrodynamics. In this work, we describe observations of confined particles dynamics by using oscillation optical tweezers and compare the results with known theories and other experimental data.