Amplitude calibration of 2D mechanical resonators by nonlinear optical transduction
Robin Dolleman (TU Delft - QN/Steeneken Lab)
D. Davidovikj (TU Delft - QN/Steeneken Lab)
H. S J van der Zant (TU Delft - QN/van der Zant Lab)
Peter Steeneken (TU Delft - Dynamics of Micro and Nano Systems, TU Delft - QN/Steeneken Lab)
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Abstract
Contactless characterization of mechanical resonances using Fabry-Perot interferometry is a powerful tool to study the mechanical and dynamical properties of atomically thin membranes. However, amplitude calibration is often not performed or only possible by making assumptions on the device parameters such as its mass or the temperature. In this work, we demonstrate a calibration technique that directly measures the oscillation amplitude by detecting higher harmonics that arise from nonlinearities in the optical transduction. Employing this technique, we calibrate the resonance amplitude of two-dimensional nanomechanical resonators, without requiring knowledge of their mechanical properties, actuation force, geometric distances, or the laser intensity.