Theory of higher harmonics imaging in tapping-mode atomic force microscopy |
| |
Authors: | Li Yuan Qian Jian-Qiang and Li Ying-Zi |
| |
Institution: | Department of Applied Physics, Beihang University, Beijing 100191, China |
| |
Abstract: | The periodic impact force induced by tip-sample contact in
tapping mode atomic force microscope (AFM) gives rise to
non-harmonic response of a micro-cantilever. These non-harmonic
signals contain the full characteristics of tip-sample interaction.
A complete theoretical model describing the dynamical behaviour of
tip--sample system was developed in this paper. An analytic formula
was introduced to describe the relationship between time-varying
tip--sample impact force and tip motion. The theoretical analysis
and numerical results both show that the time-varying tip--sample
impact force can be reconstructed by recording tip motion. This
allows for the reconstruction of the characteristics of the
tip--sample force, like contact time and maximum contact force. It
can also explain the ability of AFM higher harmonics imaging in
mapping stiffness and surface energy variations. |
| |
Keywords: | tapping mode atomic force microscopy higher harmonics
imaging |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |