Tip-sample distance control using photothermal actuation of a small cantilever for high-speed atomic force microscopy
Tip-sample distance control using photothermal actuation of a small cantilever for high-speed atomic force microscopy
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DOI：
10.1063/1.2766825
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发表时间：
2007-08-01
影响因子：
1.6
通讯作者：
Ando, Toshio
中科院分区：
文献类型：
--
作者：
Yamashita, Hayato;Kodera, Noriyuki;Ando, Toshio
在原子力显微镜中，我们利用强度调制红外激光诱导悬臂梁的光热弯曲来控制尖端-表面距离。通过逆传递函数补偿消除了光热膨胀效应的慢响应。通过调节激光功率和悬臂梁偏转，可以控制针尖-样品的距离；这使得成像速度比传统的基于压电致动器的z扫描仪快得多，因为小悬臂梁的共振频率相当高。利用这种控制和其他针对高速扫描进行优化的设备，可以实现液体中蛋白质分子的视频率成像。(C)2007年美国物理研究所。
We have applied photothermal bending of a cantilever induced by an intensity-modulated infrared laser to control the tip-surface distance in atomic force microscopy. The slow response of the photothermal expansion effect is eliminated by inverse transfer function compensation. By regulating the laser power and regulating the cantilever deflection, the tip-sample distance is controlled; this enables much faster imaging than that in the conventional piezoactuator-based z scanners because of the considerably higher resonant frequency of small cantilevers. Using this control together with other devices optimized for high-speed scanning, video-rate imaging of protein molecules in liquids is achieved. (c) 2007 American Institute of Physics.