Tip-sample interaction in a "shear-force" near-field scanning optical microscope Academic Article uri icon

abstract

  • The interaction between the tip of a near-field scanning optical microscope (NSOM) and the sample it scans is analyzed and compared to a simple tapping model. The approach curves acquired with the NSOM are in excellent agreement with the model, and additional experiments strongly point against a noncontact interaction (such as shear force). Based on this model we are also able to explain the oscillations pattern of the feedback loop. We conclude that our straight-fiber tip, operating under “shear-force” control, intermittently contacts the surface it is scanning, in a way similar to the tapping mode in atomic force microscope.

publication date

  • January 1, 1999