Optical impulse mode near field scanning microscope with feedback control achieved using a piezo-electric oscillator to change the amplitude and phase of an optical fiber test head to yield improved control and sensitivity

摘要

Microscope comprises a laser light source (10), a fiber optic test head (20) with fiber optic cable between near light source (10) and at the far end the near field point light source, a piezo-electric ceramic oscillator (30) suspended from a hanging arm (34) and a feedback signal element (40) that generates a harmonic wave signal to drive the ceramic crystal. The wave produced by the piezo-electric ceramic crystal is used to change the amplitude and phase of the optical fiber test head (20) so that feedback control can be carried out.