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arXiv 1503.05053physics.ins-detcond-mat.mtrl-sciphysics.class-ph
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强加热微悬臂梁的共振频移

Resonance frequency shift of strongly heated micro-cantilevers

Felipe Aguilar Sandoval, Mickael Geitner, Éric Bertin, Ludovic Bellon

摘要:

在测量微悬臂梁偏转的光学检测设置中,部分传感光被吸收,加热机械探针。我们目前的实验证据的悬臂梁的谐振模式的频率偏移时,光功率的光学测量设置增加。该频移是温度升高的特征,并且呈现出对模式数的依赖性。推导了一个分析模型,考虑到沿悬臂梁的温度分布,它表明,频率偏移是由平均的分布加权的局部曲率为每个谐振模式。我们应用这个框架在真空中的测量,并证明了巨大的温度可以达到适度的光强度:一千{ \textdegree }C与略高于10毫瓦。最后,我们提出了一些见解的物理现象时,悬臂梁是在空气中,而不是真空。

英文摘要:

In optical detection setups to measure the deflection of micro-cantilevers, part of the sensing light is absorbed, heating the mechanical probe. We present experimental evidences of a frequency shift of the resonant modes of a cantilever when the light power of the optical measurement set-up is increased. This frequency shift is a signature of the temperature rise, and presents a dependence on the mode number. An analytical model is derived to take into account the temperature profile along the cantilever, it shows that the frequency shifts are given by an average of the profile weighted by the local curvature for each resonant mode. We apply this framework to measurements in vacuum and demonstrate that huge temperatures can be reached with moderate light intensities: a thousand {\textdegree}C with little more than 10 mW. We finally present some insight into the physical phenomena when the cantilever is in air instead of vacuum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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