Parametric Amplification in MoS₂ Drum Resonator and Effects of Nonlinearity

Parametric amplification is widely used in diverse areas from optics to electronic circuits to enhance low level signals by varying relevant system parameters. Parametric amplification has also been performed on several micro-nano resonators including nano-electromechanical system (NEMS) resonators based on two-dimensional (2D) material. Here, we study the enhancement of mechanical response in MoS2 drum resonator using degenerate parametric amplification. We use parametric pumping to modulate the stiffness of MoS2 resonator and enhance the mechanical response. We also investigate the effect of Duffing nonlinearity on parametric amplification and demonstrate it limits the gain of the mechanical resonator. At present, we are working to tune the nonlinearities to maximize the gain. Enhancing the mechanical response and understanding the limitations of the amplification in these devices is key to using these devices for practical applications.