The Numerical Simulation And Analysis Of Optical Switch Based On Microfluidics

As the microfluidic chip have many unique advantages in integration and microsize, it has been amazing developed in recent years and made a great achievements in many fields. While the optofluidics technology combine microfluidics with optical, and get the strength of these two fields. Thus, the microfluidic technology becomes more and more popular in mostly applications. While, the microfluidic optical switch is very attractive among these devices. As microfluidic optical switch can be used by many times, and the materials is little. So it will not waste any materials. Therefore, it has a brilliant future in the applications.On the base of microfluidic technology, a kind of 1ⅹ2 optical switch was designed by using the simulation software of COMSOL. It can form a three-level planar waveguide between the two different kinds of fluids, and realize the function through controlling the direction of optics, which is influenced by the velocity of fluids. This article mainly research the relationship among the velocity of fluids, planar waveguide and optical path length. The research shows that, on the condition of asymmetric structure, the width of down cladding fluid will grow with the velocity while the width of core fluid will reduce, and the optical path length will decrease with the width of down cladding fluid. On the other condition of symmetrical structure, the width of core fluid will increase with the relative velocity, and the optical path length will grow with the width of core fluid. At last, the exact parameters of microfluidic optical switch are got.It is be demonstrated that we can control the width of core layer to change the structure of planar waveguide by adjusting the velocity of fluid, so that we can change the outlet of optic to realize the microfluidic optical switch.