基于液体波导的可调Talbot效应

Tunable Talbot Effect Based on Liquid Waveguide

光学Talbot效应通常是在固体波导中产生的,并且对于一种固体波导结构,只有一种特定的Talbot效应.这种不可调节的缺陷极大地限制了Talbot效应的应用.本文设计了一种液体梯形波导（liquid trapezoidal waveguide）,通过光流控技术操纵液体扩散,实现了可调节的Talbot效应.仿真实验结果表明,该液体梯形波导不仅可以实现类似固体波导的特定Talbot效应,还可以通过调节液体流速,实现对干涉焦点所在焦面左漂移和右漂移的调控.这种液体梯形波导有效地解决了传统固体波导中Talbot效应不可调节的问题,可以应用在可调节光学系统设计中.

Optical Talbot effect is always obtained in solid waveguides.The solid-based method has a drawback of being not adjustable,that is,there is only one specific Talbot effect once fabricated,which greatly limits the applications of the Talbot effect.In this paper,we reported a liquid trapezoidal waveguide with tunable Talbot effect,by controlling the liquid diffusion with optofluidics.Simulation results show that this liquid trapezoidal waveguide can achieve the Talbot effect analogous to its solid counterparts and the unique left/right drift of focal plane by modulating the velocities of liquids.This kind of liquid waveguide can effectively solve the problem that Talbot effect is not adjustable in traditional solid waveguide and has potential for the designs of tunable optical systems.