AI 中文总结
该研究提出一种光机械方法，通过光热加热与光腔的光机械相互作用，实现对石墨烯谐振器非线性响应的主动可逆原位调控，为二维纳米机电系统力学响应调控提供通用策略。
AI 中文摘要
石墨烯谐振器具有独特的力学和电学特性，是下一代传感应用的理想候选材料。本文介绍一种光机械方法，可对石墨烯谐振器的非线性纳米力学响应实现主动、可逆、原位调控。利用光热加热以及石墨烯膜悬浮于反射衬底形成的光腔与机械振荡之间产生的光机械相互作用，研究人员实现了对谐振器线性回复力和非线性动态响应的动态控制。研究表明，杜芬非线性的强度和符号可通过光探测功率和腔深进行连续调控，从而实现硬化与软化行为之间的转变，以及几何非线性的近完全抑制。该研究结果为按需设计石墨烯谐振器的非线性动力学提供了通用平台，并为主动调控二维纳米机电系统的力学响应提供了通用策略。
英文摘要
Graphene resonators exhibit unique mechanical and electrical properties, making them promising candidates for next-generation sensing applications. Here, we introduce an optomechanical approach that enables active, reversible, in situ tuning of the nonlinear nanomechanical response of graphene resonators. By exploiting photothermal heating and the resulting optomechanical interaction between the mechanical oscillations and the optical cavity formed by a graphene membrane suspended over a reflective substrate, we achieve dynamic control over both the linear restoring force and the nonlinear dynamic response of the resonator. We show that the strength and sign of the Duffing nonlinearity can be continuously tuned through the optical probe power and cavity depth, enabling transitions between hardening and softening behavior as well as near-complete suppression of geometric nonlinearities. Our results establish a versatile platform for on-demand engineering of nonlinear dynamics in graphene resonators and provide a general strategy for active control of the mechanical response of two-dimensional nanoelectromechanical systems.
