Direct and parametric synchronization of a graphene self-oscillator
Direct and parametric synchronization of a graphene self-oscillator
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DOI：
10.1063/1.4976310
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发表时间：
2017-02-13
影响因子：
4
通讯作者：
Venstra, W. J.
中科院分区：
文献类型：
--
作者：
Houri, S.;Cartamil-Bueno, S. J.;Venstra, W. J.
我们探讨了石墨烯纳米机械振荡器耦合到参考振荡器的动力学。通过用连续波红色激光束照射鼓引起的光热反馈，迫使圆形石墨烯鼓在频率f（osc）下自振荡。通过将功率调制的蓝色激光照射到结构上来实现在频率f（sync）处与参考信号的同步。我们调查两个制度的同步作为失谐和信号强度的函数直接（f（同步）近似f（osc））和参数锁定（f（同步）近似2f（osc））。我们检测到一个政权的相位谐振，振荡器的相位表现为欠阻尼的二阶系统，与相位谐振的自然频率显示出明确的幂律依赖于锁定信号强度。利用强迫货车der Pol-Duffing-Mathieu方程定性地再现了相位共振。由AIP出版社出版。
We explore the dynamics of a graphene nanomechanical oscillator coupled to a reference oscillator. Circular graphene drums are forced into self-oscillation, at a frequency f(osc), by means of photothermal feedback induced by illuminating the drum with a continuous-wave red laser beam. Synchronization to a reference signal, at a frequency f(sync), is achieved by shining a power-modulated blue laser onto the structure. We investigate two regimes of synchronization as a function of both detuning and signal strength for direct (f(sync) approximate to f(osc)) and parametric locking (f(sync) approximate to 2f(osc)). We detect a regime of phase resonance, where the phase of the oscillator behaves as an underdamped second-order system, with the natural frequency of the phase resonance showing a clear power-law dependence on the locking signal strength. The phase resonance is qualitatively reproduced using a forced van der Pol-Duffing-Mathieu equation. Published by AIP Publishing.