Graphene mechanical oscillators with tunable frequency
Graphene mechanical oscillators with tunable frequency
复制标题
DOI：
10.1038/nnano.2013.232
复制
发表时间：
2013-12-01
影响因子：
38.3
通讯作者：
Hone, James
中科院分区：
文献类型：
--
作者：
Chen, Changyao;Lee, Sunwoo;Hone, James
振荡器从直流电源产生连续的周期信号，是现代通信系统的核心，具有多种应用，包括定时参考和频率调制器（1-7）。然而，常规振荡器通常由宏观机械谐振器（诸如石英晶体）组成，其需要过多的片外空间。在这里，我们报告了建立在微米大小，原子级薄的石墨烯纳米机械谐振器上的振荡器，其频率可以静电调谐高达14%。在室温下，这些振荡器使用简单的电路产生和转换自持机械运动。原型石墨烯压控振荡器表现出频率稳定性和足以调制射频载波信号的调制带宽。作为演示，我们使用石墨烯振荡器作为用于频率调制信号生成的有源元件，并实现高效的音频信号传输。
Oscillators, which produce continuous periodic signals from direct current power, are central to modern communications systems, with versatile applications including timing references and frequency modulators(1-7). However, conventional oscillators typically consist of macroscopic mechanical resonators such as quartz crystals, which require excessive off-chip space. Here, we report oscillators built on micrometre-size, atomically thin graphene nanomechanical resonators, whose frequencies can be electrostatically tuned by as much as 14%. Self-sustaining mechanical motion is generated and transduced at room temperature in these oscillators using simple electrical circuitry. The prototype graphene voltage-controlled oscillators exhibit frequency stability and a modulation bandwidth sufficient for the modulation of radiofrequency carrier signals. As a demonstration, we use a graphene oscillator as the active element for frequency-modulated signal generation and achieve efficient audio signal transmission.