Understanding and quantifying polariton-polariton interactions using coherent multidimensional spectroscopy

Strong coupling between photon modes and quantum well excitons embedded in a microcavity leads to the appearance of new quasi-particles called polaritons. In this thesis, we implemented coherent multidimensional spectroscopy to reveal and quantify polariton-polariton interaction through homogeneous linewidth measurements. These type of interactions are currently a hot topic in the polariton community in particular their application to the field of Bose-Einstein condensation. This work aims to measure the interaction strength through the application of coherent multidimensional spectroscopy by measuring the homogeneous linewidth for different excitation densities.