We use holographic optical tweezers to drive locally a quasi-2D colloidal suspension.

As a result, the colloidal suspension experiences a smooth transition from strong driving to very week driving as the distance from the location of driving increases. At steady state, this gives rise to  a non-uniform density distribution. We find that this density profile is a result of a competition between pressure induced by normal forces due to shear and osmotic pressure. We then use this system to study Signatures of non-equilibrium such as entropy production as a function of driving strength.