You will be part of a team that will exploit novel molecules whose fluorescence properties depend strongly on the environment, notably on their spatial confinement, to study local stresses in complex materials down to the nanometer length scale and with unprecedented temporal resolution. Based on successful preliminary tests, we will develop this innovative methodology to tackle the fundamental scientific challenge of quantifying the long-range and very non-linear elasto-plastic stresses that govern the dynamics of friction, the glass transition and rheology.