We are developing a novel 3D microfluidic shearmetry technique that enables to instantly measure the shear stress in a microscopic local region and tomographically map its 3D profile. The technique is based on the tendency of nanorods dispersed in fluids to orient along the shear stress. We capture the swift and synchronized orientation of the small nanorods, from which we derive the locally applied shear stress. How to reveal the orientation of the nanorods? The nanorods are composed of lanthanide-doped crystals exhibiting peculiarly polarized luminescence that signals their own orientation. What is the correlation between the rod-orientation and the shear stress? The stress-optical law predicts this relationship, which we exploit to empower our new microfluidic analysis platform to be highly accurate and reliable. This internship project will investigate the influence of blood flow on the metamorphosis of capillary vessels, in collaboration with Prof. Barakat at LadHyX. Understanding this phenomenon may allow to deliberately control branching, merging, and propagation behavior of blood capillaries. The student would perform inter-disciplinary works including confocal micro-spectroscopy, microfluidic manipulations, and synthetic engineering of nanocrystal probes.