Multimode Evolution And Micromixer Application Of Non-Adiabatic Microfiber Taper

Microfiber has the advantage of strong evanescent field and high optical power density, so microfiber can fabricate the highly sensitive optical sensor and non-linear optical devices, so, it becoming an important research area. Microfiber taper can couple the optical field of fiber into the microfiber or optical devices effectively which is the transition of normal standard fiber and microfiber, and it could fulfill the miniaturization of optical devices and optical interconnection between microchip. Therefore, microfiber taper has very extensive application based on complex mode conversion and evanescent field.In the paper, we mainly introduced the multimode evolution of microfiber taper and its potential application of micromixer in the microfluidic chip area. Through simulation computation and experiment verify, under the non-ad iaba tic condition, microfiber taper will produce multimode interference in the taper transition and periodic distribution of evanescent field in the taper waist. Along with the taper diameter become smaller rapidly, lots of energy propagating in the microfiber taper leaked to the outer environment, and produce heat effect of evanescent field. Based on the effect, we integrated microfiber taper and microfluidic chip, and designed a light-operated micromixer. Due to the leaked energy gasified the solution surrounding the taper and produced the air bubble, the mixer destroyed laminar flow effect with the help of disturbance of air bubble and mixed two solutions quickly.