Fig. 4: Membrane eigenfrequency.
From: Highly-sensitive wafer-scale transfer-free graphene MEMS condenser microphones
First resonance frequency modes of the three different membranes are compared and fitted with Lorentz functions. The insets show stroboscopic topography data of the +z membrane displacement through the venting holes. Below, is a Comsol simulation of the mode-shapes of each of the geometries for different pre-tensions to match the experimental resonance frequencies
