Esmenda Joshoua Condicion, Aguila Myrron Albert Callera, Wang Jyh-Yang, Lee Teik-Hui, Yang Chi-Yuan, Lin Kung-Hsuan, Chang-Liao Kuei-Shu, Katz Nadav, Kafanov Sergey, Pashkin Yuri A, Chen Chii-Dong
National Tsing Hua University Hsinchu 30013 Taiwan.
Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica National Taiwan University and National Tsing Hua University, Institute of Physics, Academia Sinica Nangang Taipei 11529 Taiwan.
Adv Sci (Weinh). 2021 May 19;8(13):2005041. doi: 10.1002/advs.202005041. eCollection 2021 Jul.
Observation of resonance modes is the most straightforward way of studying mechanical oscillations because these modes have maximum response to stimuli. However, a deeper understanding of mechanical motion can be obtained by also looking at modal responses at frequencies in between resonances. Here, an imaging of the modal responses for a nanomechanical drum driven off resonance is presented. By using the frequency modal analysis, these shapes are described as a superposition of resonance modes. It is found that the spatial distribution of the oscillating component of the driving force, which is affected by both the shape of the actuating electrode and inherent device properties such as asymmetry and initial slack, greatly influences the modal weight or participation. This modal superposition analysis elucidates the dynamics of any nanomechanical system through modal weights. This aids in optimizing mode-specific designs for force sensing and integration with other systems.
观察共振模式是研究机械振动最直接的方法，因为这些模式对刺激具有最大响应。然而，通过观察共振频率之间的模态响应，也可以更深入地理解机械运动。在此，展示了对非共振驱动的纳米机械鼓的模态响应的成像。通过频率模态分析，这些形状被描述为共振模式的叠加。研究发现，驱动力振荡分量的空间分布受驱动电极形状以及诸如不对称性和初始松弛等固有器件特性的影响，极大地影响了模态权重或参与度。这种模态叠加分析通过模态权重阐明了任何纳米机械系统的动力学。这有助于优化用于力传感以及与其他系统集成的特定模式设计。
