Study on spatio-temporal hierarchial structure in soft matter by three-dimensional microrheology

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In this study, we developed a new technique that can be measured mesoscopic local interactions and mechanical properties in soft matter which has a complex internal structure with a resolution of meso-scale in three-dimension. We developed a two-beam optical tweezers which can scan a sample in three dimensions and a multi-beam optical tweezers which can trap particles at different positions in three-dimensions. Using these systems, we measured(1) a long-range interaction between particles in a liquid crystal,(1) mechanical response of a single vesicle,(3) mesoscipic linear and nonlinear viscosity in bilayer lamellar system,(4) collective motion in hydrodynamically coupled particles.