Quasi-Zero Stiffness Vibration Isolator for Scanning Probe Microscopy

Dilution refrigerators are essential for quantum computing and condensed matter research, particularly in studying correlated physics phenomena. However, a major challenge with these systems is the vibrational noise generated by their pulsed tube cooling systems, which produces low-frequency noise in the 0.5 - 3 Hz range. This noise hinders the integration of vibration-sensitive instruments, such as scanning probe microscopes, in dilution refrigerators. In this poster, we present progress in designing and testing quasi-zero stiffness (QZS) flexures to dampen low-frequency vibrations. Using multiphysics simulations (COMSOL), we optimize the shape of QZS springs for enhanced low-frequency damping, then fabricate and test the designs, comparing experimental results with simulation predictions.