The noise of cantilevers
The noise of cantilevers
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DOI：
10.1088/0957-4484/11/3/306
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发表时间：
2000-09-01
期刊：
影响因子：
3.5
通讯作者：
Meyer, E
中科院分区：
文献类型：
--
作者：
Rast, S;Wattinger, C;Meyer, E
Micromechanical cantilevers used in atomic force microscopy are characterized by the geometry, the elastic modulus E and the quality factor Q. The sensor can be regarded as a rectangular bar clamped on one side and free on the other. In contrast to a simple harmonic oscillator a cantilever has different eigenfrequencies omega(n) and a mode-dependent spring constant D-n. Using the fluctuation-dissipation theorem we developed a simple model to calculate the thermal noise on each eigenmode for a free cantilever. With this result we can decide whether measuring on higher eigenmodes increases the force sensitivity.
