标题： 强应变诱导的纳米机械柱谐振器耦合 显示英文标题

标题： Strong Strain-Induced Coupling between Nanomechanical Pillar Resonators

摘要： 耦合谐振器网络是物理学中的一个普遍概念，构成了同步现象、超材料形成、非互易行为和拓扑效应的基础。 这类系统通常使用光学或微波谐振器进行研究。 近年来，机械谐振器作为谐振器网络的通用构建模块进入舞台，既因为它们良好的机械特性，也因为它们的固有频率方便地位于射频范围内。 垂直取向的纳米机械柱状谐振器非常适合密集集成到大型谐振器网络中。 然而，要实现这些有前景系统的潜力，需要建立一种内在的耦合机制。 在这里，我们展示了两个相邻纳米机械柱状谐振器之间的应变诱导强耦合。 这种耦合通过由柱子弯曲振动引起的联合基板中的应变分布来实现，因此耦合强度可以通过纳米柱的几何特性以及它们的间距进行控制。 实验观察到了模式混合以及纳米柱对响应中避免交叉的形成。 该耦合机制可以轻松扩展到大量纳米柱阵列，从而实现全机械谐振器网络，用于研究广泛范围的集体动力学现象。 显示英文摘要

摘要： Networks of coupled resonators are an ubiquitous concept in physics, forming the basis of synchronization phenomena, metamaterial formation, nonreciprocal behavior and topological effects. Such systems are typically explored using optical or microwave resonators. In recent years, mechanical resonators have entered the stage as universal building block for resonator networks, both for their well-controlled mechanical properties and for their eigenfrequencies conveniently located in the radio-frequency regime. Vertically oriented nanomechanical pillar resonators are ideally suited for the dense integration into large resonator networks. However, to realize the potential of these promising systems, an intrinsic coupling mechanism needs to be established. Here, we demonstrate strain-induced, strong coupling between two adjacent nanomechanical pillar resonators. The coupling is mediated through the strain distribution in the joint substrate caused by the flexural vibration of the pillars, such that the coupling strength can be controlled by the geometric properties of the nanopillars as well as their separation. Both, mode hybridization and the formation of an avoided level crossing in the response of the nanopillar pair are experimentally observed. The coupling mechanism is readily scalable to large arrays of nanopillars, enabling all-mechanical resonator networks for the investigation of a broad range of collective dynamical phenomena.