Figure 3

Vibrometry results and finite element simulation corroborating the experimental observation.

Finite element simulations over a spectral window of 19 kHz to 25 kHz (performed by implementing prescribed experimental conditions) show two resonances occurring at 21.2 kHz and at 23.4 kHz which are reflected in (a) the admittance and (b) quality factor plots. The insets are 3D representations of the surface displacements simulated at the two resonant conditions. (c) 2D contour plot and (d) 3D surface plot of a set of 25 vibrometer data points measured at the resonant frequency of 20.8 kHz, with the marked region representing the central part of the film where the THz beam is focused on. (e) Simulated surface-contour displacement plot at 21.2 kHz. The correspondence with (c) confirms that the corners where the surface displacement is independent of the excitation are the regions hosting the electrodes.