Realization of 2D scanning pattern of a fiber cantilever by nonlinear coupling

摘要

Optical coherence tomography (OCT) is a recently developed high resolution biomedical imaging method. Fast scanning speed and miniature probe is benefit for clinical applications of OCT. In this paper we present a method to realize fast lateral scanning with two-dimensional (2D) resonant scanning pattern. By driving a fiber cantilever with a bimorph actuator near its resonance, the planar motion of the fiber cantilever may develop to an elliptical motion due to nonlinear coupling with longitudinal inertia. This effect can be exploited to form 2D scanning pattern. Basic principle relevant to realization of 2D scanning pattern of the fiber cantilever scanner by ID actuator, as well as confirming experimental results are presented. Future work and system configuration on implementing this fiber cantilever scanner in the sample arm of a fiber-based OCT system is proposed.