Computational Modeling Study Of Laser-induced Thermal Bubbles For Microfluidic Mixing

In recent years, people began to have more and more interest in the field of small-scale and rapid process and invest a lot of research. For chemical analysis testing, chemical synthesis, biological sensing and environmental monitoring, micromixer has great application space. Due to size limitation, the effect of mixing solution in a short time for the general machinery micromixer is not good. We use the light control micromixer which integrated fiber satisfied with the microfluidic chip, and import laser into the micromixer. Therefore, we can achieve micromixer micro-miniaturization, and both can take full advantage of the heat of light to mix solutions.In the paper, we mainly introduced the multimode evolution of microfiber taper and its application of micromixer in the microfluidic chip area. Through simulation computation and experiment verify, under the non-adiabatic 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.