基于微流控技术的光开关数值模拟分析

发布时间：2018-04-03 02:02

本文选题：微流控光开关　切入点：平面光波导　出处：《南京邮电大学》2015年硕士论文

【摘要】：近年来,微流控芯片由于在集成化、微型化等很多方面具有的独特优势,得到了迅猛的发展,并且在众多领域取得了显著的成果。微流控光学技术融合了微流控技术和光学技术,在当前的应用中还比较新颖。微流控光学器件的种类日益繁多,而微流控光开关的研制也逐渐成为其中的一个热点。由于微流控光开关的重复性好、尺寸小、可重构性好,它具有良好的应用前景。本文在微流控技术的基础上,利用COMSOL仿真软件,设计研究了一种由压力驱动的1ⅹ2微流控光开关模型。该光开关利用微流道内不互溶液体界面形成了三层平面波导结构,通过调节不同液体的入口流速可以控制光线的出射方向实现光开关的功能。本文主要研究了对称结构和非对称结构的微流控光开关的流场、波导结构随流速的变化、光程与波导结构的对应关系。研究表明,在非对称结构的微流控光开关中,下包层的入口宽度随着下包层的入口流速的增加而增加;芯层的宽度随着下包层的入口流速的增加而减小,光程长是随着下包层的宽度的变大而减小。在对称结构的微流控光开关中,当芯层的流速增大时,芯层的宽度会随着芯层入口的流速的增大而增大;光程长是随着芯层的宽度的变大而增大。并且,根据仿真结果得出了光开关在实现开时所满足的具体参数。计算结果表明,可以通过调节芯包层流速的大小,控制芯包层液体的宽度,改变平面波导的结构,以改变出射光的出射端口,实现光开关的切换。
[Abstract]:In recent years, microfluidic chips have developed rapidly because of their unique advantages in integration and miniaturization, and have achieved remarkable results in many fields.Microfluidic optics, which combines microfluidic and optical technologies, is novel in current applications.There are more and more kinds of microfluidic optical devices, and the development of microfluidic optical switches has gradually become a hot spot.Because of its good repeatability, small size and good reconfiguration, microfluidic optical switch has a good prospect of application.On the basis of microfluidic technology, a 1 x 2 microfluidic optical switch model driven by pressure is designed and studied by using COMSOL simulation software in this paper.The optical switch forms a three-layer planar waveguide structure by using the insoluble liquid interface in the microchannel. The function of the optical switch can be realized by adjusting the inlet velocity of different liquids to control the outgoing direction of the light.In this paper, the flow field of microfluidic optical switches with symmetric and asymmetric structures is studied. The variation of waveguide structure with the flow velocity and the relationship between optical path and waveguide structure are studied.The results show that the inlet width of the lower cladding increases with the increase of the inlet velocity of the lower cladding, while the width of the core decreases with the increase of the inlet velocity of the lower cladding in the asymmetric microfluidic optical switch.The optical path length decreases with the width of the lower cladding.In the symmetric microfluidic optical switch, the width of the core increases with the increase of the flow velocity at the inlet of the core layer, and the optical path length increases with the width of the core layer.According to the simulation results, the specific parameters of the optical switch are obtained.The calculation results show that the width of the core-cladding liquid can be controlled by adjusting the flow velocity of the core-cladding layer, and the structure of the planar waveguide can be changed to change the output port of the emitting light and the switch of the optical switch can be realized.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN492

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