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Published February 1, 1996 | public
Journal Article Open

Noise reduction in atomic force microscopy: Resonance contact mode


Noise reduction has been accomplished in atomic force microscopy by applying a high frequency, low amplitude vibration to the cantilever while it is in contact with a surface. The applied excitation (>~200 kHz; ~1 nm) is acoustically coupled to the tip and dampens the resonance Q factors of the system. The applied frequency is well above the bandwidth of the acquisition system (50 kHz). We call this mode "resonance contact" mode. The nonlinear behavior of the tip–sample interaction allows the high frequency excitation to effectively broaden the frequency response of the system resonances.

Additional Information

©1996 American Institute of Physics. (Received 5 June 1995; accepted 6 November 1995) S.D.O. is supported by a NIH traineeship. The authors would like to thank R. Murray for helpful conversations. Also, the CIT authors thank Topometrix for the installation and maintenance of the Discoverer SPM system located in their laboratory.


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