An atom in front of a surface is one of the simplest and fundamental problem in physics. Yet, it allows testing quantum electrodynamics, while providing platforms for quantum technologies. In particular, the presence of electromagnetic quantum fluctuations leads to a force between an atom and a surface. This force is called the Casimir-Polder (C-P) force. Despite its simplicity, C-P interaction, at its fundamental level, remains largely unexplored. In this context, our team has built a slow atomic beam interacting with a nanograting. This jet interacts with a carefully self-engineered nanograting, leading to a diffraction pattern dominated by the C-P force. The current interest of the experiment is to achieve an in-depth understanding of the C-P interaction. To achieve this goal, the successful applicant will take an active role in various aspects of the experiment including data acquisition, data analysis, the development of tools for characterizing the atomic source, and the installation of an optical dipole trap. Additionally, the internship has as well a theoretical component with the description of the interference figure and quantum electrodynamic calculations. The short-term goal of the project is to tailor the C-P interaction using material geometries. In the medium term, this work will open the door to study eventual modifications of the Newtonian gravitational interaction at short range, where C-P interaction shields such forces.