Energy losses of nanomechanical resonators induced by atomic force microscopy-controlled mechanical impedance mismatching.
Energy losses of nanomechanical resonators induced by atomic force microscopy-controlled mechanical impedance mismatching.
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DOI：
10.1038/ncomms4345
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发表时间：
2014-03-04
影响因子：
16.6
通讯作者：
Weig, Eva M.
中科院分区：
文献类型：
--
作者：
Rieger, Johannes;Isacsson, Andreas;Seitner, Maximilian J.;Kotthaus, Joerg P.;Weig, Eva M.
箝位损耗是纳米机电系统中广泛讨论的阻尼机制，限制了这些器件的性能。在这里，我们提出了一种方法来调查这个耗散通道。使用原子力显微镜尖端作为一个本地扰动的夹持区域的纳米机电谐振器，我们增加了至少一个数量级的弯曲模式的能量损失。我们解释这一点的振动能量转移到悬臂，这是理论上描述的谐振器和它的环境之间的机械阻抗失配减少。这种不匹配的理论模型，结合有限元模拟的倏逝应变场的机械模式在夹紧区域，使我们能够定量分析数据的尖端诱导阻尼的位置和力的依赖性。我们的实验产生的见解与工程谐振器网络中的能量交换的前景的纳米机电系统的阻尼。 在纳米机械系统中，最小化机械谐振器与其支撑件之间的振动能量损失是非常期望的。在这里，作者使用原子力显微镜的尖端按下的谐振器的夹紧区域，从而研究和控制不同的振动模式的能量损失。
Clamping losses are a widely discussed damping mechanism in nanoelectromechanical systems, limiting the performance of these devices. Here we present a method to investigate this dissipation channel. Using an atomic force microscope tip as a local perturbation in the clamping region of a nanoelectromechanical resonator, we increase the energy loss of its flexural modes by at least one order of magnitude. We explain this by a transfer of vibrational energy into the cantilever, which is theoretically described by a reduced mechanical impedance mismatch between the resonator and its environment. A theoretical model for this mismatch, in conjunction with finite element simulations of the evanescent strain field of the mechanical modes in the clamping region, allows us to quantitatively analyse data on position and force dependence of the tip-induced damping. Our experiments yield insights into the damping of nanoelectromechanical systems with the prospect of engineering the energy exchange in resonator networks. Minimizing vibrational energy loss between mechanical resonators and their supports in nanomechanical systems is highly desirable. Here, the authors use the tip of an atomic force microscope to press down on the clamping region of the resonator, so as to study and control energy loss of different vibrational modes.
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