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Results of the ANSYS simulation of cantilevers with a modified geometry. (a) Ratio of the resonance frequencies of the first and second oscillation modes for a variation of the lengths of a wider anchored part and a narrower free end of the cantilever. A minimum in is observed for . (b) Resonance frequency ratio for a variation of the width of the anchored part of a cantilever consisting of two equally long parts . The inset shows the oscillation modes.
(Color online) Frequency spectrum of a cantilever with modified geometry (parameters are given in the figure) using an AFM in ambient air, an excitation amplitude of , and a gain of 30. The fundamental resonance mode is at and the second mode at , resulting in a ratio .
UHV-KPFM image of on HOPG. (a) The topography (gray ) shows several surface steps and (b) the CP image (gray ) shows a clear contrast between (bright contrast) and HOPG (dark contrast).
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