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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Nano Lett. 2009 Jun;9(6):2273–2279. doi: 10.1021/nl9004332

FIG. 3.

FIG. 3

Frequency jitter vs. tip-sample voltage over a 466 nm thick PMMA film at various heights. Data (points) and parabola fits (lines) are shown for tip-sample heights of d = 75 nm (black triangles), d = 100 nm (green squares) and d = 250 nm (blue circles). The cantilever amplitude was xrms = 75 nm and the cutoff frequencies were fL = 0 Hz and fU = 100 Hz.