Parametric amplification has wide applications in optics and electronics to enhance the signal by modulating relevant system parameters.
In the case of a mechanical resonator, the stiffness is modulated at a certain frequency to achieve parametric amplification. Nano-electro-mechanical system (NEMS) based on two dimensional materials are promising next generation ultra-sensitive sensors. Capabilities of these sensors are enhanced with the amplified gain and the improved quality factors using parametric amplification. The present study demonstrates parametric amplification in Molybdenum disulfide (MoS_2) drum resonator. The study also emphasizes the impact of Duffing non-linearity on parametric amplification in the NEMS resonator. The presence of Duffing non-linearity in the system reduces the maximum achievable gain. Studying the effects of non-linearity on parametric amplification is important to achieve the maximum benefits from the NEMS devices. See more here