5. Intermittent microscopy (TM)

An oscillation of high frequency (300 kHz), close to the spring resonance frequency (high stiffness: k = 10 -40 N/m; quality factor Q = 100 to 1,000) and variable amplitude (A _i = 10 to 100 nm), is imposed on the spring [13] . Initially, the tip is far from the surface and the spring oscillates freely (amplitude A ₀ ). Then, when the surface is brought closer to the polymer, the tip, for each low position,...