Metamaterials based on microfabricated subwavelength resonators are essential for high-performance devices in the terahertz (THz) frequency range, where they allow precise tailoring of electromagnetic responses. However, conventional far-field characterization techniques are diffraction-limited, preventing direct access to near-field properties. As a result, near-field measurements with subwavelength resolution have become a major research challenge. To address this, the SAI group of the LPL is launching a new project focused on probing the near field of THz micro-resonators using Rydberg atoms as quantum sensors. Building on prior demonstrations of THz-to-visible conversion in atomic vapor cells (L. A. Downes et al., Phys. Rev. X, 2020), this approach can also enable near-field sensing when atoms are brought into close proximity with metamaterials. The experiment also offers a platform to control Casimir–Polder interactions via tunable THz resonances. A Master’s internship is proposed to develop this experiment. The student will participate in constructing an atomic vapor cell integrating THz micro-resonators, perform near-field Rydberg-atom spectroscopy, and potentially contribute to resonator fabrication and characterization in collaboration with C2N. The Masters's internship could lead to a PhD, financed by the ANR projetc TERRA.