Thermomechanical noise limits on parametric sensing with nanomechanical resonators
Thermomechanical noise limits on parametric sensing with nanomechanical resonators
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DOI：
10.1088/1367-2630/7/1/235
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发表时间：
2005-11-29
影响因子：
3.3
通讯作者：
Cleland, AN
中科院分区：
文献类型：
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作者：
Cleland, AN
测量和监测纳米机械谐振器的动态参数，特别是谐振频率，最近受到了极大的关注，部分原因是非常灵敏、快速和精确的质量传感的可能性。增加的质量可以包括化学吸附或物理吸附的金属或有机分子，如果能够实现足够高的灵敏度、动态范围和检测器速度，它们可以在例如检测等领域得到应用。例如，蛋白质组学。在这里，我研究了此类谐振器中质量传感的一些基本限制，讨论了热机械噪声对简单谐振子的线性工作状态施加的限制，以及用作参数传感器的非线性参数放大器的等效限制。该模型系统是悬臂弯曲谐振器，但结果同样适用于（在大多数情况下）双夹紧或扭转谐振结构。
Measuring and monitoring the dynamic parameters of a nanomechanical resonator, in particular the resonance frequency, has received significant attention recently, in part due to the possibility of very sensitive, fast and precise mass sensing. Added mass can include chemisorbed or physisorbed metals or organic molecules, and if sufficiently high sensitivity, dynamic range and detector speed can be achieved, they could have applications in, e. g., proteomics. Here, I investigate some of the fundamental limits to mass sensing in such resonators, discussing the limits imposed by thermomechanical noise on both the linear operating regime of a simple harmonic oscillator, and the equivalent limits on nonlinear parametric amplifiers used as parametric sensors. The model system is a cantilevered flexural resonator, but the results apply equally well (in most cases) to doubly clamped or torsional resonant structures as well.