Accurate flexural spring constant calibration of colloid probe cantilevers using scanning laser Doppler vibrometry

Calibration of the flexural spring constant for atomic force microscope (AFM) colloid probe cantilevers provides significant challenges. The presence of a large attached spherical added mass complicates many of the more common calibration techniques such as reference cantilever, Sader, and added mas...

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Bibliographic Details
Published in:Nanotechnology 2015-06, Vol.26 (23), p.235704-235704
Main Authors: Gates, Richard S, Osborn, William A, Shaw, Gordon A
Format: Article
Language:English
Subjects:
Atomic force microscopy
Calibration
cantilever
colloid probe
Colloids
Doppler
Doppler effect
Lasers
Spring constant
Uncertainty
vibrometry
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Summary:Calibration of the flexural spring constant for atomic force microscope (AFM) colloid probe cantilevers provides significant challenges. The presence of a large attached spherical added mass complicates many of the more common calibration techniques such as reference cantilever, Sader, and added mass. Even the most promising option, AFM thermal calibration, can encounter difficulties during the optical lever sensitivity measurement due to strong adhesion and friction between the sphere and a surface. This may cause buckling of the end of the cantilever and hysteresis in the approach-retract curves resulting in increased uncertainty in the calibration. Most recently, a laser Doppler vibrometry thermal method has been used to accurately calibrate the normal spring constant of a wide variety of tipped and tipless commercial cantilevers. This paper describes a variant of the technique, scanning laser Doppler vibrometry, optimized for colloid probe cantilevers and capable of spring constant calibration uncertainties near 1%.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/26/23/235704