Cavity-enhanced optical detection of carbon nanotube Brownian motion
Cavity-enhanced optical detection of carbon nanotube Brownian motion
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DOI：
10.1063/1.4802746
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发表时间：
2012-11
影响因子：
4
通讯作者：
Sebastian Stapfner;Lukas Ost;D. Hunger;J. Reichel;I. Favero;E. Weig
中科院分区：
文献类型：
--
作者：
Sebastian Stapfner;Lukas Ost;D. Hunger;J. Reichel;I. Favero;E. Weig
具有小模体积的光学腔非常适合于检测亚波长尺寸物体的振动。在这里，我们采用了基于光纤的，高精细光学微腔检测布朗运动的自由悬浮的碳纳米管在室温下真空。光学检测可将振荡管的偏转分辨率降低至70 pm/Hz 1/2。获得碳纳米管的完整振动光谱，并通过在扫描电子显微镜中表征相同的装置来确认。我们的工作将高灵敏度光机械检测的原理扩展到分子尺度的纳米机械系统。
Optical cavities with small mode volume are well-suited to detect the vibration of sub-wavelength sized objects. Here we employ a fiber-based, high-finesse optical microcavity to detect the Brownian motion of a freely suspended carbon nanotube at room temperature under vacuum. The optical detection resolves deflections of the oscillating tube down to 70 pm/Hz1/2. A full vibrational spectrum of the carbon nanotube is obtained and confirmed by characterization of the same device in a scanning electron microscope. Our work extends the principles of high-sensitivity optomechanical detection to molecular scale nanomechanical systems.