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. Author manuscript; available in PMC: 2018 Aug 17.

Published in final edited form as: Phys Rev Fluids. 2016 Dec 13;1:081201. doi: 10.1103/PhysRevFluids.1.081201

Fig. 1 — Experimental setup and results. (a) Microspheres of radius a = 1.74 μm, situated at a distance h above a no-slip boundary are driven by time-sharing optical tweezers in circular trajectories of radius R = 1.59 μm and center-to-center separation ℓ = 9.19 μm. (b) Average phase drift $\dot{χ} = {\dot{ϕ}}_{1} - {\dot{ϕ}}_{0}$ for a rotor pair vs detuning D for h = 4.2 (), 6.7 (), 11.7 (), 16.7 (), 31.7 (), 51.7 () μm. (c) Phase diagram showing experimental regions of synchrony (blue) and drift (red), the boundary from hydrodynamic simulations (dashed), and theory from Eq. (2) (solid).

Inline graphic — Experimental setup and results. (a) Microspheres of radius a = 1.74 μm, situated at a distance h above a no-slip boundary are driven by time-sharing optical tweezers in circular trajectories of radius R = 1.59 μm and center-to-center separation ℓ = 9.19 μm. (b) Average phase drift $\dot{χ} = {\dot{ϕ}}_{1} - {\dot{ϕ}}_{0}$ for a rotor pair vs detuning D for h = 4.2 (), 6.7 (), 11.7 (), 16.7 (), 31.7 (), 51.7 () μm. (c) Phase diagram showing experimental regions of synchrony (blue) and drift (red), the boundary from hydrodynamic simulations (dashed), and theory from Eq. (2) (solid).